Write the modes by which insects affect the crop yield.

Weeds affect the crop plants by

In an agricultural field there is a prevalance of the following organisms and crop diseases which are affecting the crop yield badly: a) White rust b) Leaf and strips rust dc) Black rot d) Jassids Recommend the varieties of crops the farmers should grow to get rid of te existing problem and thus improve the crop yeild

Give the names of two insect resistant crop varieties.

Name the crop plant which is affected by red rot.

Mention three different ways in which insect pests can attack the crop plant.

Excessive use of fertilizers, pesticides and insecticides to increase crop yield leads to