Question

Identify the disease and its causal organism on the basis of given information and select the correct option.

	Diseases	Causal organisms
(i)	Yellow vein mosaic	Yellow vein mosaic virus
(ii)	Tobacco mosaic	Tobacco mosaic virus
(iii)	Rust of wheat	Puccinia graminis
(iv)	Citrus canker	Xanthomonas citri

• A. (i)
• B. (iii)
• C. (ii)
• D. (iv)

Answer 1

The correct option is A (i)

Yellow vein mosaic is a plant disease caused by the yellow vein mosaic virus (YVMV) which is transmitted by whitefly. Yellowing of the entire network of veins in the leaf blade is the characteristic symptom. In severe infections the younger leaves turn yellow, become reduced in size and the plant is highly stunted. Since the disease cannot be controlled properly by chemical means, the only practical solution of this problem is to develop tolerant/resistant varieties.