Donald Groth | 11/5/2011 1:07:55 AM
Photos of rice sheath blight disease caused by the fungus Rhizoctonia solani, including fungal signs and symptoms on the plant.
Slide 1: Young culture of Rhizoctonia solani grown on potato dextrose agar showing mycelium and sclerotia formation.
Slide 2: Old culture of Rhizoctonia solani grown on potato dextrose agar showing darker mycelium and extensive sclerotia formation.
Slide 3: Rhizoctonia solani mycelium growing in agar (note right angle branching pattern).
Slide 4: Rhizoctonia solani mycelium grown on agar-coated microscope slides stained with cotton blue (note right angle branching pattern).
Slide 5: Electron micrograph of Rhizoctonia solani mycelium on a rice leaf showing mycelium growth and infection cushion formation.
Slide 6: Rhizoctonia solani mycelium growing from a sheath blight lesion allowing leaf-to-leaf and plant-to-plant movement in the field.
Slide 7: Early water-soaked sheath blight lesions on rice stems.
Slide 8: Older dried sheath blight lesions on rice stems.
Slide 9: Diversity of sheath blight lesions.
Slide 10: Severe sheath blight damage on rice stems.
Slide 11: Sheath blight lesion development showing early and late lesion development on rice leaves.
Slide 12: Typical snake skin-like lesion symptoms on rice leaves.
Slide 13: Severe sheath blight lesions on rice leaves at maturity.
Slide 14: Typical damage to rice leaves from sheath blight infection.
Slide 15: Late-season sheath blight damage to rice plants.
Slide 16: Severe sheath blight damage to rice.
Slide 17: Typical sheath blight symptoms on rice leaves with sclerotia development.
Slide 18: Sheath blight damage to rice head.
Slide 19: Sheath blight damage to rice flag leaf sheath and head with sclerotia development.
Slide 20: Older sheath blight leaf lesion with early stage sclerotial development.
Slide 21: Sclerotial development on sheath blight lesion.
Slide 22: Typical sheath blight “bird nest” damage in a rice field.
Slide 23: Arial view of sheath blight damage in a rice field showing windblown distribution of floating inoculum early in the season.
Slide 24: Lodging caused by sheath blight damage to the rice stems.
Slide 25: Sheath blight damaged susceptible (left) and healthy resistant (right) rice lines that were inoculated with Rhizoctonia solani.
Slide 26: Sheath blight-resistant and susceptible rice lines in a disease nursery.
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