Apples Pears:Photos

Apple and Pear Pest and Nutritional Disorder Photos

2,4-D_herbicide_injury_on_pear

2,4-D herbicide injury on pear (N. S. Luepschen; Colorado State University)

Alternaria_Blotch_1

Alternaria Blotch 1

Alternaria blotch on Delicious apple leaf.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Alternaria_Blotch_2

Alternaria Blotch 2

Progressive development of Alternaria blotch across leaves on a shoot of Delicious apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_bitter_pit,_calcium_deficiency

Apple bitter pit, calcium deficiency (H. J. Larsen; Colorado State University)

Apple_crown_gall

Apple crown gall (N. S. Luepschen; Colorado State University)

Apple_crown_gall

Apple crown gall (N. S. Luepschen; Colorado State University)

Apple_maggot_damage,_external_appearance_of_fruit

Apple maggot damage, external appearance of fruit (H. J. Larsen; Colorado State University)

Apple_maggot_damage,_internal_&_external_appearance_of_fruit

Apple maggot damage, internal & external appearance of fruit (H. J. Larsen; Colorado State University)

Apple_maggot_fruit_damage

Apple maggot fruit damage (H. J. Larsen; Colorado State University)

Apple_Mosaic

Apple Mosaic

Creamy-yellow areas in apple leaves infected with apple mosaic virus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_mosaic_virus,_leaf_symptoms_on_Golden_Delicious

Apple mosaic virus, leaf symptoms on Golden Delicious (H. J. Larsen; Colorado State University)

Apple_replant_disease_(ARD),_response_to_fall_preplant_fumigation

Apple replant disease (ARD), response to fall preplant fumigation (R. P. Covey; Colorado State University)

Apple_replant_problem,_left_non-fumigated,_right_fumigated

Apple replant problem, left non-fumigated, right fumigated (P. Burts; Colorado State University)

Apple_replant_study_-_ARD_bioassay_results_@_76_days

Apple replant study - ARD bioassay results @ 76 days (H. J. Larsen; Colorado State University)

Apple_scab_fruit_infection

Apple scab fruit infection (P. Burts; Colorado State University)

Apple_scab_lesion_1

Apple scab lesion 1

Apple scab lesions on fruit and leaves near midseason.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_2

Apple scab lesion 2

Primary apple scab lesions on the undersides of McIntosh apple leaves.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_3

Apple scab lesion 3

Sporulation of Venturia inaequalis in scab lesions on a McIntosh apple leaf.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_4

Apple scab lesion 4

Primary scab infection on the blossom end (calyx) of a McIntosh apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_5

Apple scab lesion 5

Cracking of McIntosh fruit associated with large scab lesions late in the season.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_6

Apple scab lesion 6

Cross-section of a pseudothecium of the apple scab fungus with pigmented mature ascospores in rows of eight ascospores per ascus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_7

Apple scab lesion 7

Germination of a conidium of the apple scab fungus. The spore sends out a short germ tube with an appressorium at its tip from which the fungus penetrates the host tissue. Ascospores germinate similarly.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_8

Apple scab lesion 8

Presymptom scab control. Chlorotic apple scab lesions produced when a sterol demethylation inhibitor was applied after infection but before symptoms were observed.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_scab_lesion_9

Apple scab lesion 9

Post symptom scab control. Necrotic apple scab lesions produced when a dodine-captan combination was applied to control visible infections.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_Union_Necrosis_and_Decline_1

Apple Union Necrosis and Decline 1

Typical weak growth and pale coloration of foliage of Delicious on Mm.106 rootstock with apple union necrosis and decline.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_Union_Necrosis_and_Decline_2

Apple Union Necrosis and Decline 2

Line of dead tissue at the union between the Delicious scion and the MM.106 rootstock is typical of union necrosis and decline.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_Union_Necrosis_and_Decline_3

Apple Union Necrosis and Decline 3

Breaking off of apple tree at the union between rootstock and scion is typical of union necrosis and decline.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Apple_winter_injury

Apple winter injury (N. S. Luepschen; Colorado State University)

ARD_symptoms_of_poor_growth_on_2nd_leaf_tree,_non-fumigated

ARD symptoms of poor growth on 2nd leaf tree, non-fumigated (R. P. Covey; Colorado State University)

Bitter_Rot_

Bitter Rot

Bitter_Rot_1

Bitter Rot 1

Golden Delicious apple with bitter rot lesion. Note the sunken nature and presence of acervuli with salmon or pink spores.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Bitter_Rot_2

Bitter Rot 2

Later stage of bitter rot. Note depressed lesions with concentric rings of acervuli and conidia.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Bitter_Rot_3

Bitter Rot 3

Conidia of Colletotrichum gloeosporioides within an acervulus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Bitter_Rot_4

Bitter Rot 4

Conidia of Colletotrichum gloeosporioides extruding from phialides within the acervulus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Bitter_Rot_5

Bitter Rot 5

Golden Delicious apple infected with a perithecial strain of the bitter rot fungus. Lesions are usually not sunken and are often darker than those caused by conidial strains.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Black_Pox

Black Pox

Small black spots of black pox, caused by Helminthosporium papulosum, on Grimes Golden apples.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Black_Root_Rot

Black Root Rot

Finger-like fruiting structures of the black root rot pathogen Xylaria mali.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Black_Rot_

Black Rot

Black_Rot_1

Black Rot 1

Initial stages of black rot. Note necrotic spots developing below mummified fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Black_Rot_2

Black Rot 2

Two Cortland apples with black rot. Note brown, wavy patterns developing at the calyx end and a mummified fruit with pycnidia.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Black_Rot_Mummy_and_Frog-Eye_Leaf_Spot_

Black Rot Mummy and Frog-Eye Leaf Spot

Blister_bark_3

Blister bark on delicious apple (C. L. Parish, USDA)

Blister_Spot_1

Blister Spot 1

Shiny, raised blister spot lesions on Mutsu apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Blister_Spot_2

Blister Spot 2

Expanded blister spot lesions on mature Cortland apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Blister_Spot_3

Blister Spot 3

Shoot of Mutsu with ooze droplet containing blister spot bacteria and curled leaves due to infection on the midvein.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Blossom_Blast_of_Pear

Blossom Blast of Pear

Blossom blast of pear. Note death of spur but failure of shoot to become infected.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Blotch

Blotch

Apple blotch on the fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Brooks_Spot_1

Brooks Spot 1

Brooks spot on Jonathan apple fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Brooks_Spot_2

Brooks Spot 2

Brooks spot on the calyx end of Grimes Golden apples.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Brooks_Spot_3

Brooks Spot 3

Small purple spots on an apple leaf caused by the Brooks spot fungus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Bull's-eye_Rot

Bull's-eye Rot

Bull's-eye rot on McIntosh apple. Note light color in center of depressed lesion and alternating areas of tan and brown.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Calcium_deficiency,_Jonathan_spot

Calcium deficiency, Jonathan spot (N. S. Luepschen; Colorado State University)

Calcium_deficiency_corky_spot_on_d'_Anjou_pear

Calcium deficiency corky spot on d' Anjou pear (N. S. Luepschen; Colorado State University)

Cedar_Apple_Rust_Gall

Cedar Apple Rust Gall

Cedar_Apple_Rust_on_Leaf_

Cedar Apple Rust on Leaf

Cherry_raspleaf_virus,_normal_vs_symptomatic_fruit

Cherry raspleaf virus, normal vs symptomatic fruit (C. L. Parish; Colorado State University)

Concentric_ring_pattern_1

Concentric ring pattern on pear, calyx end (T. Van der Zwet, USDA)

Cycle_apple_scab

Cycle apple scab

Disease cycle of apple scab.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Cycle_blight

Cycle blight

Disease cycle of blight.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Cycle_powdery_mildew

Cycle powdery mildew

Disease cycle of powdery mildew.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Cycle_rust

Cycle rust

Disease cycle of cedar-apple rust.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Cytospora_canker_dieback_on appple

Cytospora canker dieback on apple (H. J. Larsen; Colorado State University)

Cytospora_canker_infection_growth_on_apple

Cytospora canker infection growth on apple (H. J. Larsen; Colorado State University)

Cytospora_canker_lesions_on_apple

Cytospora canker lesions on apple (H. J. Larsen; Colorado State University)

Cytospora_canker_of_apple

Cytospora canker of apple (N. S. Luepschen; Colorado State University)

Cytospora_spore_threads_on_apple

Cytospora spore threads on apple (P. Burts; Colorado State University)

Dry-Eye_and_Calyx-end_Rots_1

Dry-Eye and Calyx-end Rots 1

Dry-eye rot, caused by Botrytis cinerea, on McIntosh apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Dry-Eye_and_Calyx-end_Rots_2

Dry-Eye and Calyx-end Rots 2

Calyx-end rot on Paulared apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

European_canker_(Nectria_galligena)_fruiting_bodies_on_apples

European canker (Nectria galligena) fruiting bodies on apples (H. J. Larsen; Colorado State University)

European_canker_on_apple

European canker on apple (H. J. Larsen; Colorado State University)

Fabraea_Leaf_Spot_1

Fabraea Leaf Spot 1

Fruit of Tennessee Selection #345298 (left) and Bartlett pear (right) infected by the Fabraea leaf spot pathogen.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fabraea_Leaf_Spot_2

Fabraea Leaf Spot 2

Surface view of an acervulus of Entomosporium maculatum breaking through the epidermis.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fabraea_Leaf_Spot_3

Fabraea Leaf Spot 3

A conidium of Fabraea leaf spot with two lateral setae or hair-like structures attached to the cells.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_Blight

Fire Blight

Fire_blight_1

Fire blight 1

Apple tree with dieback of spurs and shoots caused by fire blight.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_2

Fire blight 2

First symptoms of blossom blight. Note ooze droplets and discoloration of the blossom on the lower right.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_3

Fire blight 3

Fruit spurs on pear with fire blight-infected blossoms.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_4

Fire blight 4

Apple shoot with fire blight. Note crook at tip.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_5

Fire blight 5

Bacterial ooze exuding from an apple infected with fire blight.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_6

Fire blight 6

Necrotic spots with red margins on apple caused by fire blight. Infection associated with a severe storm about 8 weeks after bloom.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_7

Fire blight 7

Decline of Spy apple trees due to infection of the Mark rootstock by fire blight.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_8

Fire blight 8

Fire blight on apple rootstocks just below ground level. Bark cut away to show the margin between healthy and diseased crown and root tissues.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Fire_blight_canker_on_pear

Fire blight canker on pear (N. S. Luepschen; Colorado State University)

Fire_blight_canker_with_ooze_on_pear

Fire blight canker with ooze on pear (N. S. Luepschen; Colorado State University)

Fire_blight_infection_&_scaffold_loss_of_apple

Fire blight infection & scaffold loss of apple (C. E. Swift; Colorado State University)

Fire_blight_on_2bartlett_pear_

Fire blight on bartlett pear (N. S. Luepschen; Colorado State University)

Fire_blight_on_pear_shoots

Fire blight on pear shoots (N. S. Luepschen; Colorado State University)

Flat_apple_(cherry_raspleaf_virus)_tree_symptoms_(growth_pattern)

Flat apple (cherry raspleaf virus) tree symptoms (growth pattern)

(H. J. Larsen; Colorado State University)

Freeze_damage_to_apple_flowers

Freeze damage to apple flowers (A. R. Renquist; Colorado State University)

Freeze_damage_to_apple_flowers

Freeze damage to apple flowers (A. R. Renquist; Colorado State University)

Freeze_damage_to_bartlett_pear_shoots

Freeze damage to bartlett pear shoots (H. J. Larsen; Colorado State University)

Freeze_injury_to_apple_shoots

Freeze injury to apple shoots (H. J. Larsen; Colorado State University)

Frost_injury/hail_injury

Spring frost injury and hail injury S. V. Thomson, Utah State University

Golden_apple,_northwestern_anthracnose_canker

Golden apple, northwestern anthracnose canker (H. J. Larsen; Colorado State University)

Golden_Delicious_apple,_apple_wood_rot,_(Trametes_hispida)

Golden Delicious apple, apple wood rot, (Trametes hispida)

(N. S. Luepschen; Colorado State University)

Golden_Delicious_apple,_apple_wood_rot_(Trametes_hispida)

Golden Delicious apple, apple wood rot (Trametes hispida)

(N. S. Luepschen; Colorado State University)

Golden_Delicious_apple_frost_injury

Golden Delicious apple frost injury (A. R. Renquist; Colorado State University)

Golden_Delicious_apple_iron_chlorosis_(deficiency)_leaf_symptoms

Golden Delicious apple iron chlorosis (deficiency) leaf symptoms (A. R. Renquist; Colorado State University)

Gray_Mold

Gray Mold

A "nest" of apples with gray mold caused by Botrytis.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Hail_damage_on_pear_tree_bark

Hail damage on pear tree bark (H. J. Larsen; Colorado State University)

Hail_damage_to_apple_fruit

Hail damage to apple fruit (H. J. Larsen; Colorado State University)

Jonathan_apple_slime_flux_kill,_cambium_injury_symptoms

Jonathan apple slime flux kill, cambium injury symptoms (N. S. Luepschen; Colorado State University)

Jonathan_apple_slime_flux_on_lower_trunk

Jonathan apple slime flux on lower trunk (N. S. Luepschen; Colorado State University)

Jonathan_spot,_internal_calcium_deficiency

Jonathan spot, internal calcium deficiency (C. R. Ure; Colorado State University)

Leucostoma_Canker_1

Leucostoma Canker 1

A Leucostoma canker on Delicious apple with characteristic rough, scaly bark.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Leucostoma_Canker_2

Leucostoma Canker 2

Dieback of a central leader of Delicious apple caused by Leucostoma canker.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Moldy_Core_1

Moldy Core 1

Cross-section of apple with moldy core developing around the core region.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Moldy_Core_2

Moldy Core 2

Close-up of seed cavity overgrown with mold.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Mycosphaerella_Leaf_Spot

Mycosphaerella Leaf Spot

Mycosphaerella leaf spot on pear leaves and fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Necrotic_Leaf_Blotch_1

Necrotic Leaf Blotch 1

Golden Delicious leaves with necrotic leaf blotch. Early symptom development is shown in top row; greatly advanced stage in bottom row.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Necrotic_Leaf_Blotch_2

Necrotic Leaf Blotch 2

Leaf yellowing and defoliation of Golden Delicious from necrotic leaf blotch. The bottom leaves exhibit symptoms first, followed by upper leaves.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Nectria_Canker

Nectria Canker

Nectria canker on the trunk of Delicious apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Nectria_Twig_Blight_1

Nectria Twig Blight 1

Dieback of Rome Beauty apple shoot from Nectria twig blight. Note canker at the base of the shoot.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Nectria_Twig_Blight_2a

Nectria Twig Blight 2a

Canker and orange fruiting structures of Nectira twig blight fungus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Nectria_Twig_Blight_2b

Nectria Twig Blight 2b

Canker and orange fruiting structures of Nectira twig blight fungus.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Nectria_Twig_Blight_3

Nectria Twig Blight 3

Orange fruiting structures of the Nectria twig blight fungus in a canker on McIntosh apple associated with a pruning wound.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Northwestern_anthracnose_canker_on_apple

Northwestern anthracnose canker on apple (H. J. Larsen; Colorado State University)

Orchard,_overhead_sprinkler_ice_damage

Orchard, overhead sprinkler ice damage (N. S. Luepschen; Colorado State University)

Pear_decline,_early_fall_leaf_coloration

Pear decline, early fall leaf coloration (H. J. Larsen; Colorado State University)

Pear_decline_(MLO)_branch_&_foliage_symptoms

Pear decline (MLO) branch & foliage symptoms (N. S. Luepschen; Colorado State University)

Pear_decline_(MLO)_branch_symptoms

Pear decline (MLO) branch symptoms (N. S. Luepschen; Colorado State University)

Pear_decline_(MLO)_growth_symptoms

Pear decline (MLO) growth symptoms (N. S. Luepschen; Colorado State University)

Pear_decline_(MLO)_whole_tree_symptoms

Pear decline (MLO) whole tree symptoms (N. S. Luepschen; Colorado State University)

Pear_fire_blight_canker_with_ooze

Pear fire blight canker with ooze (N. S. Luepschen; Colorado State University)

Pear_fire_blight_caused_by_hail_damage

Pear fire blight caused by hail damage (N. S. Luepschen; Colorado State University)

Pear_fire_blight_shoot_infection_+_ooze

Pear fire blight shoot infection + ooze (N. S. Luepschen; Colorado State University)

Pear_fire_blight_shoot_infection_symptoms

Pear fire blight shoot infection symptoms (N. S. Luepschen; Colorado State University)

Pear_fire_blight_strikes_in_top_of_tree

Pear fire blight strikes in top of tree (N. S. Luepschen; Colorado State University)

Pear_frost_damage

Pear frost damage (N. S. Luepschen; Colorado State University)

Pear_frost_injury

Pear frost injury (N. S. Luepschen; Colorado State University)

Pear_root_stock_union

Pear root stock union (N. S. Luepschen; Colorado State University)

Pear_scab

Pear scab (L. E. Sommers; Colorado State University)

Pear_Scab_1

Pear Scab 1

Scab on young pear fruit and leaves.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Pear_Scab_2

Pear Scab 2

Pear scab lesions on current-season shoot growth.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Penicillium_expansum_(blue_mold)_rot_on_pear_fruit

Penicillium expansum (blue mold) rot on pear fruit (H. J. Larsen; Colorado State University)

Penicillium_expansum_(blue_mold)_rot_on_pear_fruit

Penicillium expansum (blue mold) rot on pear fruit (H. J. Larsen; Colorado State University)

Perennial_canker_+_woolly_aphids_on_apple

Perennial canker + woolly aphids on apple (H. J. Larsen; Colorado State University)

Perennial_canker_of_apple

Perennial canker of apple (H. J. Larsen; Colorado State University)

Phytophthora_collar_rot_symptoms

Phytophthora collar rot symptoms (N. S. Luepschen; Colorado State University)

Phytophthora_crown_rot,_Early_Jonathan_trunk_canker

Phytophthora crown rot, Early Jonathan trunk canker (H. J. Larsen; Colorado State University)

Phytophthora_crown_rot,_Erly_Jonathan_weak_tree_symptoms

Phytophthora crown rot, Erly Jonathan weak tree symptoms (H. J. Larsen; Colorado State University)

Phytophthora_crown_rot,_premature_fall_leaf_coloration

Phytophthora crown rot, premature fall leaf coloration (H. J. Larsen; Colorado State University)

Phytophthora_Root,_Crown,_and_Collar_Rot

Phytophthora Root, Crown, and Collnar Rot

Brown decay of rootstock collar just below ground, a common symptom of Phytophthora root, crown and collar rot.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Phytophthora_root_rot_symptoms_of_Jonathan_apple

Phytophthora root rot symptoms of Jonathan apple (N. S. Luepschen ; Colorado State University)

Powdery_Mildew

Powdery Mildew

Powdery_Mildew_1

Powdery Mildew 1

Powdery mildew-infected apple shoot. Note distorted leaves and white growth on leaves and along the shoot.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Powdery_Mildew_2

Powdery Mildew 2

White growth of powdery mildew fungus on apple leaves emerging from overwintered infected buds.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Powdery_Mildew_3

Powdery Mildew 3

Fruit showing net russeting from powdery mildew infection.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Powdery_mildew_apple_shoot_infection

Powdery mildew apple shoot infection (H. J. Larsen; Colorado State University)

Powdery_mildew_on_apple_2nd_growth_flush

Powdery mildew on apple 2nd growth flush (N. S. Luepschen; Colorado State University)

Powdery_mildew_pear_fruit_infection

Powdery mildew pear fruit infection (N. S. Luepschen; Colorado State University)

Powdery_mildew_pear_shoot_infection

Powdery mildew pear shoot infection (N. S. Luepschen; Colorado State University)

Powdery_mildew_russet_on_Jonathan_apple_fruit_(right_-_healthy)

Powdery mildew russet on Jonathan apple fruit (right - healthy) (N. S. Luepschen; Colorado State University)

Powdery_mildew_vs_non_mildewed_apple_trees

Powdery mildew vs non mildewed apple trees (N. S. Luepschen; Colorado State University)

Red_delicious_apple,_blister_bark_(virus)_symptoms

Red delicious apple, blister bark (virus) symptoms (N. S. Luepschen; Colorado State University)

Red_delicious_apple,_dapple_apple_(viroid)_fruit_symptoms

Red delicious apple, dapple apple (viroid) fruit symptoms (H. J. Larsen; Colorado State University)

Red_delicious_apple,_flat_apple_(cherry_raspleaf_virus)_fruit_symptoms

Red delicious apple, flat apple (cherry raspleaf virus) fruit symptoms (H. J. Larsen; Colorado State University)

Rome_apple_blue_mold

Rome apple blue mold (N. S. Luepschen; Colorado State University)

Rome_apple_fire_blight_infection_on_scaffold

Rome apple fire blight infection on scaffold (N. S. Luepschen; Colorado State University)

Rome_apple_sunscald_+_bridge_graft

Rome apple sunscald + bridge graft (C. R. Ure; Colorado State University)

Rust_1

Rust 1

Necrotic spots with orange margins on apple leaves caused by cedar-apple rust.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_2

Rust 2

Micrograph of a pycnium of cedar-apple rust fungus with a few periphyses extended and some pycniospores. Nectar drops were removed during preparation.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_3

Rust 3

Cross-section of an apple leaf showing young aecia "cluster-cups" of the cedar-apple rust fungus on the underside of the leaf.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_4

Rust 4

Distortion of calyx end and red discoloration of Delicious apple caused by quince rust.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_5

Rust 5

Tiny cedar-apple rust galls with gelatinous spore horns in axils of cedar leaves.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_6

Rust 6

Cedar-apple rust gall on cedar with gelatinous spore horns fully extended.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_7

Rust 7

Quince rust canker on cedar with gelatinous spore horns fully extended.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_8a

Rust 8a

Micrograph of a gelatinous spore horn from a cedar-apple rust fall. Teliospores of the cedar-apple rust fungus with slight constriction at the crosswall and single teliospore bearing promycelium (left) and formation of secondary basidiospore on a pointed sterigmata (right). Other basidiospores can be seen on the left.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Rust_8b

Rust 8b

Micrograph of a gelatinous spore horn from a cedar-apple rust fall. Teliospores of the cedar-apple rust fungus with slight constriction at the crosswall and single teliospore bearing promycelium (left) and formation of secondary basidiospore on a pointed sterigmata (right). Other basidiospores can be seen on the left.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Scab_on_Fruit_

Scab on Fruit

Scab_on_Young_Fruit_and_Leaf

Scab on Young Fruit and Leaf

Slime_flux_on_black_Jonathan_apple

Slime flux on black Jonathan apple (N. S. Luepschen; Colorado State University)

Soft_Rot/Blue_Mold_1

Soft Rot/Blue Mold 1

Golden Delicious apple with soft rot/blue mold. Note cushions of blue-green fungus growth on surface lesion.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Soft_Rot/Blue_Mold_2

Soft Rot/Blue Mold 2

Conidiosphores of the soft rot pathogen Penicillium expansum. Note one-celled ovoid conidia produced on brush-like structures.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Sooty_Bloch_and_Flyspeck_1

Sooty Bloch and Flyspeck 1

Mycelial type of sooty blotch and a few flyspeck lesions on the surface of apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Sooty_Bloch_and_Flyspeck_2

Sooty Bloch and Flyspeck 2

Flyspeck lesions (groups of black, shiny dots) on the surface of Rome Beauty apple.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Sooty_Blotch_and_Flyspeck

Sooty Blotch and Flyspeck

Southern_Blight_1

Southern Blight 1

Trees in a nursery row with dieback due to infection at soil line by the southern blight pathogens.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Southern_Blight_2

Southern Blight 2

White, web-like mycelium of Sclerotium rolfsii. Light brown to yellow, round sclerotia often form in the mycelial mat.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Stony_Pit_of_Pear

Stony Pit of Pear

Bosc pear fruit severely gnarled from stony pit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Sulfur_burn_to_apple_foliage

Sulfur burn to apple foliage (N. S. Luepschen; Colorado State University)

Sulfur_burn_to_apple_foliage

Sulfur burn to apple foliage (N. S. Luepschen; Colorado State University)

Sulfur_burn_to_apple_fruit_and_foliage

Sulfur burn to apple fruit and foliage (N. S. Luepschen; Colorado State University)

Thread_Blight

Thread Blight

Apple branch affected with thread blight showing dead leaves still attached.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Union_necrosis_(TmRS_virus)_of_apple

Union necrosis (TmRS virus) of apple (H. J. Larsen; Colorado State University)

White_Root_Rot

White Root Rot

White mycelium of the white root rot fungus growing over the surface of the trunk.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

White_Rot_1

White Rot 1

Early stages of white or bitter rot on fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

White_Rot_2

White Rot 2

Several examples of white rot on Golden Delicious fruit. Apple on lower left is infected with black rot.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

White_Rot_3

White Rot 3

Internal fruit symptoms of bitter rot (left) and apple white rot (right). Decay from white rot (but not bitter rot) usually reached and surrounds the core.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

White_Rot_4

White Rot 4

Reddish brown lesions on bark of Golden Delicious apple is the early symptom of white rot caused by Botryosphaeria dothidea.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

White_Rot_5

White Rot 5

Exudation of liquid from a blister in an active white rot canker.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Woolly_aphids_on_apple

Woolly aphids on apple (N. S. Luepschen; Colorado State University)

X_disease_vector_adult,_Fieberiella_florii

X disease vector adult, Fieberiella florii (C. L. Parish; Colorado State University)

X_disease_vector_adult,_Fieberiella_florii

X disease vector adult, Fieberiella florii (C. L. Parish; Colorado State University)

X_disease_vector_adult,_Scaphytopius_acutus

X disease vector adult, Scaphytopius acutus (C. L. Parish; Colorado State University)

X_disease_vector_adult_&_nymph,_Fieberiella_florii

X disease vector adult & nymph, Fieberiella florii (C. L. Parish; Colorado State University)

X-Spot

X-Spot

X-spot on the calyx end of apple fruit.

(Alan L. Jones, Michigan State University and Turner B. Sutton, North Carolina State University)

Zinc_deficiency_1

Zinc deficiency (right), healthy leaves (left)

(S. V. Thomson, Utah State University)

Zinc_deficiency_2

Zinc deficiency (right), healthy leaf (left) (S. V. Thomson, Utah State University)