Alfalfa:Photos

Alfalfa Pest and Nutritional Disorder Photos

Agrobacterium_tumefaciens

Agrobacterium tumefaciens Large galls from inoculation of young plants with Agrobacterium tumafaciens (Deborah Samac)

Alfalfa_mosaic_virus

Alfalfa mosaic virus (Fred Frosheiser)

Alfalfa_mosaic_virus

Alfalfa mosaic virus (Fred Frosheiser)

Alfalfa_mosaic_virus

Alfalfa mosaic virus (Fred Frosheiser)

Alfalfa_stem_nematode_2

Alfalfa stem nematode white flagging, Ditylenchus dipsaci (Gerald D. Griffin, USDA)

Alfalfa_stem_nematode_damage

Alfalfa stem nematode damage (H. F. Schwartz; Colorado State University)

Alfalfa_stem_nematode_damage

Alfalfa stem nematode damage (H. F. Schwartz; Colorado State University)

Anthracnose_-_Sorghum

Anthracnose - Sorghum

Aphanomyces_root_rot

Aphanomyces root rot on inoculated seedlings; rating 1 (healthy) to 5 (dead) (Deborah Samac)

Ascochyta_Rough_Spot_-_Sorghum

Ascochyta Rough Spot - Sorghum

Bacterial_leaf_spot

Bacterial leaf spot (Fred Frosheiser)

Bacterial_leaf_spot

Bacterial leaf spot (Fred Frosheiser)

Bacterial_leaf_spot_1

Bacterial leaf spot water-soaked lesions (Donald L. Stuteville, Kansas State University)

Bacterial_leaf_spot_2

Bacterial leaf spot translucent lesions (Donald L. Stuteville, Kansas State University)

Bacterial_leaf_spot_3

Bacterial leaf spot lesions, alfalfa stems 3 weeks after inoculation (Donald L. Stuteville, Kansas State University

Bacterial_wilt

Bacterial wilt root cross sections. Most diseased (top left) to healthy (bottom right) (Barnes)

Bacterial_wilt_symptoms

Bacterial wilt symptoms in the field (front plant) compared to a healthy plant behind (Deborah Samac)

Bacterial_wilt_symptoms

Bacterial wilt symptoms. Healthy plant (left), diseased root section (middle), diseased plant (right) (Barnes)

Blister_beetle_on_alfalfa

Blister beetle on alfalfa (Colorado State University)

Calonectria_crotalariae

Calonectria crotalariae infected alfalfa plant (base and stem) (Donald L. Stuteville, Kansas State University)

Cercospora_leaf_spot

Leaf spot, Cercospora medicaginis (William G. Willis, Kansas State University)

Cercospora_on_leaves

Cercospora on leaves (Fred Frosheiser)

Cercospora_on_stems

Cercospora on stems (Fred Frosheiser)

Common_leaf_spot

Common leaf spot (Fred Frosheiser)

Common_leaf_spot

Commonleaf spot (Fred Frosheiser)

Common_leaf_spot_1

'Common leaf spot (William G. Willis, Kansas State University)

Common_leaf_spot_3

Common leaf spot lesions (magnified view), dentate margins, Pseudopeziza medicaginis apothecia rupturing, host epidermis (William G. Willis, Kansas State University)

Dodder

Dodder (USDA-ARS)

Downy_mildew

Downy mildew (Fred Frosheiser)

Downy_mildew_1

Shoot systemically infected with downy mildew fungus, Peronospora trifoliorum (Kenneth T. Leath, USDA)

Downy_mildew_2

Downy mildew, upper (left), lower (right) surfaces, leaflets (Donald L. Stuteville, Kansas State University)

Downy_mildew_3

Downy mildew fungus oospores (Peronospora trifoliorum), cotyledon stained, sudan iv (Donald L. Stuteville, Kansas State University)

Downy_mildew_in_the_field

Downy mildew in the field (Fred Frosheiser)

Foliar_tolerance

Differences in foliar tolerance, low temperature among spaced plants (Donald L. Stuteville, Kansas State University)

Frost_injury

Frost injury (Barnes)

Frost_injury

Frost injury (Barnes)

Fusarium_wilt

Fusarium wilt in alfalfa roots, cross sections. Healthy (top left) to most diseased (bottom right) (Fred Frosheiser)

Fusarium_wilt

Fusarium wilt in alfalfa roots, longitudinal section (Barnes)

Fusarium_wilt_(left)_and_bacterial_wilt_(right)

Fusarium wilt (left) and bacterial wilt (right) (Barnes)

Genetic_abnormailty_12

Genetic abnormality: taproot tumors (Donald K. Barnes, USDA)

Genetic_abnormailty_15

Genetic abnormality: heavy bark condition, rough root showing lack, functional small roots (Donald K. Barnes, USDA)

Genetic_abnormality_00

Genetic abnormalities  : pale green leaves, stem (left), normal green leaves, stem, light red stem, dark red stem (right)(Donald K. Barnes, USDA)

Genetic_abnormality_01

Genetic abnormality  : white leaf spotting induced, low temperatures, long days (Donald K. Barnes, USDA)

Genetic_abnormality_02

Genetic abnormality  : mottled leaf (Donald K. Barnes, USDA)

Genetic_abnormality_03

Genetic abnormality  : white mosaic leaf spotting (Donald K. Barnes, USDA)

Genetic_abnormality_04

Genetic abnormality  : golden tip, characterized, chlorosis, newly developed leaves (Donald K. Barnes, USDA)

Genetic_abnormality_05

Genetic abnormality  : curled leaf (Donald K. Barnes, USDA)

Genetic_abnormality_06

Genetic abnormality  : vestigial flower, branched raceme (Donald K. Barnes, USDA)

Genetic_abnormality_07

Genetic variability , seed color: normal (center), tan, black, dark red, mottled, light red mottled seed colors, nonuniform distribution, red endosperm pigment (Donald K. Barnes, USDA)

Genetic_abnormality_08

Genetic abnormalities white (normal), tan, brown roots (Donald K. Barnes, USDA)

Genetic_abnormality_09

Genetic abnormality  : red root (Donald K. Barnes, USDA)

Genetic_abnormality_10

Genetic abnormality  : cross section, roots showing normal white internal root (left), orange root (Donald K. Barnes, USDA)

Genetic_abnormality_11

Genetic abnormality  : stem cuttings showing normal rooting (left), abnormal callus tumor (Donald K. Barnes, USDA)

Genetic_abnormality_13

Genetic abnormality  : excessive root lenticel development, healthy tissue underneath (left), normal root, plant grown, wet soil (Donald K. Barnes, USDA)

Genetic_abnormality_14

Genetic abnormality  : variability, expression, rough root; normal root, right (Donald K. Barnes, USDA)

Helminthosporium_Leaf_Spot_-_Bermuda

Helminthosporium Leaf Spot - Bermuda

Ineffective_nodulation

Ineffective nodulation (2 plants on left), effective nodulation (2 plants on right) (Barnes)

Ineffective_nodules

White ineffective nodules (right) and effective nodules (left) (Barnes)

Leaf_Spot_-_Alfalfa_Pseudopeziza_Jonesii

Leaf Spot - Alfalfa Pseudopeziza Jonesii

Leaf_Spot_-_Alfalfa_Pseudopeziza_Medicaginis

Leaf Spot - Alfalfa Pseudopeziza Medicaginis

Lepto_leaf_spot

Lepto leaf spot (Fred Frosheiser)

Neocosmospora_vasinfecta

Neocosmospora vasinfecta perithecia (red) exuding ascospores (orange) on alfalfa stem, water agar (Donald L. Stuteville, Kansas State University)

Nitrogen_deficiency

Ineffective plants growing in sand with nil nitrogen (left) compared to effective plants (right) (Barnes)

Nitrogen_deficiency

Ineffective plants growing in sand with nil nitrogen (right) compared to effective plants (left) (Barnes)

Ozone_damage

Ozone damage rated 0 (no damage) to 10 (severe damage) (Fred Frosheiser)

Peanut_Mottle_Virus_-_Clover

Peanut Mottle Virus - Clover

Phytophthora_medicaginis

Germinating oospore of Phytophthora medicaginis with zoosporangium (Fred Frosheiser)

Phytophthora_medicaginis

Zoosporangia of Phytophthora medicaginis stained red (Fred Frosheiser)

Phytophthora_root_rot

Phytophthora root rot symptoms in July (Fred Frosheiser)

Phytophthora_root_rot

Phytophthora root rot, healthy (left) to most diseased (right) (Barnes)

Phytophthora_root_rot

Phytophthora root rot, young plants (Fred Frosheiser)

Pseudoplea_Leaf_Spot_-_Clover

Pseudoplea Leaf Spot - Clover

Rhizobium_nodules_1

Effective (eff) rhizobium nodules on alfalfa root, three types, ineffective (in) nodules induced, alfalfa plant genotype (Carroll P. Vance, USDA)

Rhizoctonia

Rhizoctonia (3 plants on right), healthy (3 plants on left) (Barnes)

Rhizoctonia_symptoms

Rhizoctonia symptoms (Barnes)

Root_knot_nematode

Root knot nematode symptoms (left and right), healthy plant (middle) (Fred Frosheiser)

Root_knot_nematode

Root knot nematode 12 healthy plants (left), 12 susceptible plants (right) (Fred Frosheiser)

Root_knot_nematode_symptoms

Root knot nematode symptoms (Fred Frosheiser)

Root-lesion_nematode

Root-lesion nematode field symptoms (center), healthy plants (left and right) (Deborah Samac)

Root-lesion_nematode

Root-lesion nematode symptoms (right) and healthy plant (left) (Theis)

Root-lesion_nematodes

Root-lesion nematodes and eggs stained red in alfalfa roots (Deborah Samac)

Rust_2

Rust on leaflet, uredinial pustules (Donald L. Stuteville, Kansas State University)

Rust_symptoms

Rust symptoms (Fred Frosheiser)

Rust_symptoms

Rust symptoms and potato leaf hopper symptoms (Fred Frosheiser)

Sclerotium_1

Sclerotim Mature (brown) sclerotia (Sclerotium rolfsii) on plant base, Mycelium producing sclerotia progresses up the stem (Donald L. Stuteville, Kansas State University)

Spring_blackstem_and_leaf_spot

Spring blackstem and leaf spot (Fred Frosheiser)

Spring_blackstem_and_leaf_spot

Spring blackstem and leaf spot (Fred Frosheiser)

Stagnospora_symptoms

Stagnospora symptoms on leaf (Fred Frosheiser)

Stagnospora_symptoms

Stagnospora symptoms on the crown (Fred Frosheiser)

Stem_canker

Stem canker, Rhizoctonia solani (William G. Willis, Kansas State University)

Stem_nematode

Stem nematode (Fred Frosheiser)

Stem_nematode

Stem nematode (Fred Frosheiser)

Stem_nematode

Stem nematode (Fred Frosheiser)

Stem_nematode

Stem nematode symptoms in the field (white flagging) (Fred Frosheisegr)

Stem_nematode_on_inoculated_seedlings

Stem nematode on inoculated seedlings Resistant plants (left); susceptible plants (right) (Fred Forosheiser)

Stemphylium_symptoms

Stemphylium symptoms (Fred Frosheiser)

Sulfur_dioxide_injury

Sulfur dioxide injury (Kenneth T. Leath, USDA)

Tarspot

Tarspot, Phoma medicaginis (Kenneth T. Leath, USDA)

Verticillium_albo-atrum_1

Verticillium albo-atrum infected leaflets, v-shaped chlorosis, tip, curling (Kenneth T. Leath, USDA)

Verticillium_albo-atrum_3

Verticillium albo-atrum infected leaflets, pinkish necrosis (Kenneth T. Leath, USDA)

Verticillium_albo-atrum_4

Verticillium albo-atrum necrotic leaves infected (Kenneth T. Leath, USDA)

Verticillium_wilt

Verticillium wilt crown symptoms (Fred Frosheiser)

Verticillium_wilt

Verticillium wilt foliar symptoms (Fred Frosheiser)

Verticillium_wilt

Verticillium wilt foliar symptoms (Fred Frosheiser)

Verticillium_wilt

Verticillium wilt in the field (Fred Frosheiser)

Violet_root_rot_2

Violet root rot fungus (Rhizoctonia crocorum) on crown/root (William G. Willis, Kansas State University)

Yellow_leaf_blotch_1

Yellow leaf blotch early symptoms (William G. Willis, Kansas State University)