Observe Fig.2.1 and answer the questions that follow.
(a) Write the name of the disease.
(b) Name the causative agent of this disease?
(c) How does the disease spread from one plant to another?
(d) Name any two plant diseases and the microbes that cause them.
Observe Fig.2.1 and answer the questions that follow.
(a) Write the name of the disease.
(b) Name the causative agent of this disease?
(c) How does the disease spread from one plant to another?
(d) Name any two plant diseases and the microbes that cause them.
(a) Yellow vein mosaic of lady’s finger/okra/ bhindi.
In a yellow vein mosaic, 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. The veins of the leaves will be cleared by the virus and the internal area becomes completely yellow or white
(b) Yellow vein mosaic of lady’s finger/okra/ bhindi is caused by the virus (Begomovirus).
(c) The disease spreads from one plant to another through insects (whiteflies).
The damage is caused by the begomovirus, which is transmitted through whiteflies (female whiteflies are more efficient than males in transmitting the virus). The viruses do not replicate in their vector but are moved readily from plant to plant by the adult whitefly by various means.
(d)
(i) Citrus canker is a contagious plant disease caused by the bacterium Xanthomonas citri
(ii) Leaf rust, caused by Puccinia triticina, is the most common rust disease of wheat.
(a) Yellow vein mosaic of lady’s finger/okra/ bhindi.
In a yellow vein mosaic, 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. The veins of the leaves will be cleared by the virus and the internal area becomes completely yellow or white
(b) Yellow vein mosaic of lady’s finger/okra/ bhindi is caused by the virus (Begomovirus).
(c) The disease spreads from one plant to another through insects (whiteflies).
The damage is caused by the begomovirus, which is transmitted through whiteflies (female whiteflies are more efficient than males in transmitting the virus). The viruses do not replicate in their vector but are moved readily from plant to plant by the adult whitefly by various means.
(d)
(i) Citrus canker is a contagious plant disease caused by the bacterium Xanthomonas citri
(ii) Leaf rust, caused by Puccinia triticina, is the most common rust disease of wheat.
