Question

The disease yellow vein mosaic is associated with:
a. Apple
b. Ladyfinger
c. Sugarcane
d. Mustard

Answer 1

Hint: The Yellow Vein Mosaic disease affects the members of the Malvaceae Family. This was a disease which was first discovered in the year 1924 in India and Sri Lanka. The yellow vein mosaic is a viral disease caused by the virus Begomovirus. The carrier of the disease is the whitefly.

Complete answer:
Yellow vein mosaic disease highly affects the yield of the okra plant. It also reduces the growth of the plant since it affects almost all the stages in the life cycle of okra.
This is one of the major problems faced by the cultivators of okra or lady finger.

The yellow vein mosaic causes the plant to develop a network of yellow colored veins surrounding the green tissues. Initially, only the veins of the leaves turn yellow, but in the later stages the entire leaf turns yellow in colour. There is no green color visible on the leaf.

- Butter rot, black rot and white rot are the diseases which affect the apple fruit. It causes lesions or dark spots on the apple.
- Red rot, smut and wilt, grassy shoot or albino, are the diseases which affect the sugarcane plant.
- Alternaria black spot, bacterial black rot, downy mildew, white rust are some.of the diseases which affect the mustard plant.
- Powdery mildew, Cercospora leaf spot, Fusarium wilt are some other diseases of okra.

Hence, the correct answer is option (B).

Note: Some of these infected plants have certain raised structures appear on the dorsal side of the leaf. The infected plant bears fruit which are deformed in shape, small and rough in structure and pale yellow in color. The overall growth of the plant is also stunted.