Question

Q21. Name one plant disease caused by virus and its mode of transmission?
Q22. How can we control plant diseases?
Q23. Name one plant disease caused by fungi and its mode of transmission.?

Answer 1

Answer:

1) TOBACCO MOSAIC VIRUS (TMV)

2)A variety of chemicals are available that have been designed to control plant diseases by inhibiting the growth of or by killing the disease-causing pathogens. Chemicals used to control bacteria (bactericides), fungi (fungicides), and nematodes (nematicides) may be applied to seeds, foliage, flowers, fruit, or vegetables.

3)Rhizosphaera needle cast is caused by the fungus Rhizosphaera kalkhoffii. The fungus survives winter on living and recently killed needles. In spring through early autumn, spores spread to new needles within the tree or in neighboring trees via splashing water.

hope it helps

pls mark as brainliest