Have you seen any diseased plant in your farm?

Yes, I have seen some diseased plants in our farm. There are different pathogens like fungi, bacteria, viruses that cause diseases in plants. 

The common plant diseases are: 

(a) Leaf rust disease: It is caused by fungus Puccinia triticina. It is the most common rust disease of wheat. 

(b) Blight disease in rice: It is caused by harmful bacteria Xanthomonas oryzae. It causes wilting of seedlings and yellowing and drying of leaves. 

(c) Early blight of potato: It is caused by fungi Alternaria solani. It causes ‘bulls eye’ patterned leaf spots and tuber blight on potato. 

(d) Crown gall disease: It is caused by Agrobacterium tumefaciens. This pathogen infects the plant and forms rough surfaced galls on stem and roots.