Southwest monsoon season in Sri Lanka enters in late May just before it enters the Indian subcontinent. In India it enters in June and in Pakistan in early July and remains till the end of September. Summer monsoon season in Pakistan is of great importance for its agricultural, economic and social purposes. These rains are not only used for water needs of plants in agricultural sector but also to kill the insects by physical beating. By irrigating the fields, certain insect pests like crickets attacking the cotton seedlings and the white ants attacking cotton, sugarcane, chilies and other crops can be drowned in rain water and thus crops can be saved. Monsoon in Pakistan contributes almost 65-75 % of the total annual rainfall.