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Potato Plant Bacterial Diseases Quiz

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Questions and Answers

What is the pathogen responsible for Ring Rot of Potato?

Xanthomonas campestris
Erwinia carotovora
Pseudomonas syringae
Clavibacter michiganense subsp. sepedonicum (correct)

What are the general symptoms of infected plants in the case of Ring Rot of Potato?

Leaves turn brown and fall off
Symptoms are usually overlooked or masked by other diseases (correct)
Aboveground symptoms appear early in the season
Stems become twisted and curly

What is the optimum temperature for the growth of Clavibacter michiganense subsp. sepedonicum?

10-15°C
30-35°C
20-29°C (correct)
40-45°C

What happens if a wilted stem is cut at the base in the case of Ring Rot of Potato?

It oozes creamy exudate out of the vascular bundles (A) Signup and view all the answers

What symptom is observed on the leaves and stems in the case of Ring Rot of Potato?

Yellowing of leaf veins with necrotic leaf margins (A) Signup and view all the answers

What are the symptoms of Ring Rot of Potato on the leaves and stems?

The interveinal areas of its leaflets turn yellowish, and the leaf margins roll upward and become necrotic. The leaves then begin to wilt, continuing until all the leaves of the stem wilt and the stem then dies. Signup and view all the answers

What is the impact of Ring Rot of Potato on the crop yield?

Losses of up to 50% of the crop have been noted in severe infections. Signup and view all the answers

Describe the appearance of the pathogen Clavibacter michiganense subsp. sepedonicum.

Creamy colonies, Gram positive, Non motile, Aerobic, round or pleomorphic rod, Non-spore forming. Signup and view all the answers

When do the aboveground symptoms of Ring Rot of Potato usually appear?

Infected plants usually don't show aboveground symptoms until they are fully grown or the symptoms occur so late in the season that they are overlooked or masked by other diseases. Signup and view all the answers

What symptom may appear in years with cool springs and warm summers in the case of Ring Rot of Potato?

In years with cool springs and warm summers, one or more of the stems may appear stunted. Signup and view all the answers