A) Describe the mechanism of disease development or the host–parasite relationship in white rust of Crucifers

A) Describe the mechanism of disease development or the host–parasite relationship in white rust of Crucifers.

B) What is obligate parasitism? Describe the life cycle of Albugo candida along with its methods of disease control.

C) Write notes on the following with special reference to controlling the diseases:

(i) Late blight of potato

(ii) White rust of crucifers

(iii) Downy mildew of grapes

(iv) Downy mildew of cucurbits

(v) Leaf blight of Colocosia

(vi) Collar rot of apple

(vii) Damping of diseases