Question

Red rot of sugarcane and white rust of Radish are respectively caused by :
A) Albugo candida and Cercospora
B) Colletotrichum and Fusarium
C) Pythium and Phtyophthora
D) Albugo candida and Puccinia graminis
E) Colletotrichum and Albugo candida

Answer 1

Hint:Red rot is a common disease seen in sugarcane and white rust are seen commonly in radish and wild mustards. Both of these plant diseases are caused by fungi.

Complete answer:
Let's look at the details of both the diseases.
A fungus, known as Colletotrichum causes red rot of sugarcane, one of the most severe diseases seen in sugarcane, which are widely distributed throughout the sugarcane growing countries in the world. This disease can ultimately wipe out the sugarcanes in a large area. The common symptoms of this disease include drooping and yellowing of leaves, followed by wilting of entire plants and later, to the death of the plant. The pigment produced in the cells as a result of this disease causes the red colour appearance of sugarcane.

A fungus known as Albugo candida is the causative agent of white rust in radishes. This disease mostly affects the leaves of the plants, but it may affect other parts in later courses of time. When the infection caused by the disease gets matured, powdery white spores are released. These spores are carried out by wind and water for spreading the infection to other plants. One of the effective methods to reduce the effect of the disease is crop rotation. During crop rotation, the number of spores produced gets reduced and thereby reducing the risk of the disease.

Let's look at the options for the correct answer:
Option E: Colletotrichum and Albugo candida are the causative organisms of red rot in sugarcane and white rust in radish, respectively. Therefore, this is the correct option.
Option A, B, C, D are the incorrect options.

Thus the correct option is E) Colletotrichum and Albugo candida

Note:Red rot seen in sugarcane occurs mainly in the rainy season. Transmission medium of this disease is soil. It can also be transmitted by rainwater. Extremely moisture content is most suitable for occurring white rust in radish. Transmission of white rust occurs by air.