3. What is the mode of transmission of the following diseases ?
(a) Rust of wheat (b) Citrus canker (c) Yellow vein mosaic of bhindi (Okra)
Answers
a.Leaf rust, also known as brown rust, is caused by the fungus Puccinia triticina. This rust disease occurs wherever wheat, barley and other cereal crops are grown. ... These overwintering fungi develop spores in the spring, which are blown north to infect wheat in the Great Plains and Midwest states.
b.The disease can also be spread by contaminated equipment, and by transport of infected or apparently healthy plants. Due to latency of the disease, a plant may appear to be healthy, but actually be infected. Citrus canker bacteria can enter through a plant's stomata or through wounds on leaves or other green parts.
c.Insect
Answer:
Explanation: a) leaf rust
b.The disease can also be spread by contaminated equipment, and by transport of infected or apparently healthy plants. Due to latency of the disease, a plant may appear to be healthy, but actually be infected. Citrus canker bacteria can enter through a plant's stomata or through wounds on leaves or other green parts.
C) insect. (whitefly)