A) What is Gram stain? Give examples of Gram-positive and Gram-negative bacteria causing plant diseases

A) What is Gram stain? Give examples of Gram-positive and Gram-negative bacteria causing plant diseases.

B) How will you differentiate plant pathogenic bacteria?

C) How will you control the following diseases?

(i) Bacterial blight of paddy

(ii) Citrus canker

(iii) Bacterial Blight and Angular leaf spot of cotton

(iv) Black rot of crucifers

(v) Brown rot of potato

(vi) Yellow ear rot or tundu disease of wheat

(vii) Blackleg and soft rot of potato

(viii) Crown gall of stone fruits

(ix) Stalk rot of maize

D) What are the different antibiotics used for controlling plant bacterial diseases?