Plant Disease Causes and Diagnosis Quiz

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Questions and Answers

Which of the following is NOT a cause of plant diseases?

Fungi
Nematodes
Phanerogams (correct)
Bacteria

What is the causal organism for rice blast disease?

Viroids
Rhizoctonia solani
Pyricularia oryzae (correct)
Phytoplasmas

How would you describe the conidia of Pyricularia oryzae?

Hyaline to pale olive, bicelled (two-septate), with pyriform to obclavate shape (correct)
Produced solely by hyphae
Whitish to gray with brown to reddish brown margin
Septate, dark brown, branched at right angles

What do the lesions caused by rice blast disease look like?

Elliptical lesions resembling a spindle shape, which tapers towards each end (D) Signup and view all the answers

What is the causal organism for Rhizoctonia solani?

Rhizoctonia solani (C) Signup and view all the answers

What are the objectives of Plant Pathology Exercise 1?

<ol> <li>To become familiar with the structures and characteristics of pathogens causing plant diseases. 2. To recognize the signs and symptoms of plant disease.</li> </ol> Signup and view all the answers

What are the causes of plant diseases?

True Fungi, Fungal-like Oomycetes, Bacteria, Phytoplasmas, Nematodes, Viruses, Viroids, Phanerogams Signup and view all the answers

What is the causal organism for Rice Blast disease?

Pyricularia oryzae Signup and view all the answers

What is the appearance of the lesions caused by Rice Blast disease?

Elliptical lesions resembling a spindle shape, which tapers towards each end. Center of the spot is whitish to gray with brown to reddish brown margin. Signup and view all the answers