Which two measures can successfully control bacterial blight in chick-pea?(a) Spray with Bordeaux mixture.(b) Control the insect vector.(c) Use only disease-free seeds.(d) Use varieties resistant to the disease.

Bacterial blight is primarily seed-borne and spread by splashing water. The most effective controls are using disease-free seeds (c) to prevent initial infection and planting resistant varieties (d). Bordeaux mixture is a fungicide, not an antibiotic.