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This page showcases disease and insect images on oat and wheat plants to aid in pest identification. Click on an image to view the full-size version in a new tab.
Black chaff (black discoloration) on wheat panicle and bacterial leaf streak (chlorosis surrounding necrosis) on wheat leaves [Xanthomonas translucens spp.]
Black point discoloration [Alternaria spp., Bipolaris spp., and others] on wheat kernels.
Crown rust [Puccinia coronata] pustules on oat leaves (bright orange color can help distinguish crown rust from the darker, more brick-red color of stem rust)
Extensive leaf area coverage by crown rust [Puccinia coronata] pustules on a susceptible oat line (left) versus a more resistant line (right).
Fusarium head blight, or scab [Fusarium spp.], causing premature bleaching on wheat heads.
Fusarium head blight, or scab [Fusarium spp.], causing premature bleaching on the middle of a wheat head.
Fusarium head blight, or scab [Fusarium spp.], damage on wheat kernels. Notice the pinkish-orange discoloration.
Large halo blight [Pseudomonas syringae pv. coronafaciens] lesions on oat leaves with concentric halo of chlorosis surrounding oblong necrotic regions.
Patterned chlorosis ('mottling') of soil-borne wheat mosaic virus on wheat leaves.
Coalescing of extensive chlorosis ('mottling') on wheat leaves caused by soil-borne wheat mosaic virus.
Stem rust [Puccinia graminis f. avenae] pustules on oat stem (note the dark orange color and ripped stem tissue surrounding where the pustules erupted).
Stripe rust/yellow rust [Puccinia striiformis] pustules on wheat leaves (note the light orange color and formation of 'stripes' by clustered pustules).
Tan spot's small, scattered, purplish, early lesions [Pyrenophora tritici-repentis] on oat leaves.
Purplish spots of tan spot [Pyrenophora tritici-repentis] on oat spikelet.
Small, black fruiting structures (pseudothecia) of tan spot [Pyrenophora tritici-repentis] erupting from cuticule on oat stem.
Brown, spindle-shaped pupae of Hessian fly [Mayetiola destructor] in wheat roots.
Hessian fly [Mayetiola destructor] pupae (dark brown, spindle-shaped, lighter reddish-brown at one end) in wheat crown.
Hessian fly [Mayetiola destructor] pupae (light brown spindle-shapes) and larvae (white maggots) in wheat crown.
The LSU AgCenter and the LSU College of Agriculture