Black Spot is caused by which organism?

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Prepare for the NOCTI 6157 Pennsylvania Applied Horticulture Test. Utilize flashcards and diverse questions to enhance your understanding. Ready yourself comprehensively!

Multiple Choice

Black Spot is caused by which organism?

Explanation:
Black spot on roses is caused by a fungal pathogen, Diplocarpon rosae. This fungus creates circular black spots on leaves, often with a yellow halo, and can cause leaves to yellow and drop. It thrives in wet, cool conditions and is a classic rose disease managed by sanitation and fungicide programs. The other organisms listed cause different diseases: Pseudomonas syringae is a bacterial pathogen; Alternaria solani causes early blight on tomatoes and potatoes; Erysiphe graminis causes powdery mildew on grasses. So the organism responsible for black spot is Diplocarpon rosae.

Black spot on roses is caused by a fungal pathogen, Diplocarpon rosae. This fungus creates circular black spots on leaves, often with a yellow halo, and can cause leaves to yellow and drop. It thrives in wet, cool conditions and is a classic rose disease managed by sanitation and fungicide programs. The other organisms listed cause different diseases: Pseudomonas syringae is a bacterial pathogen; Alternaria solani causes early blight on tomatoes and potatoes; Erysiphe graminis causes powdery mildew on grasses. So the organism responsible for black spot is Diplocarpon rosae.

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