Concept of Agricultural Entomology: Agricultural Entomology is an applied subject which mainly researches interrelationships between crops including grain crops,fruits,vegetables and other economic crops and their pest insects.Pest insects'life cycles and IPM are key topics that need to be understood in order to protect crops from pest insects. 11 Concept of Agricultural Entomology: Concept of Agricultural Entomology: Agricultural Entomology is an applied Agricultural Entomology is an applied subject which mainly researches subject which mainly researches interrelationships between crops including interrelationships between crops including grain crops, fruits, vegetables and other grain crops, fruits, vegetables and other economic crops and their pest insects. Pest economic crops and their pest insects. Pest insects insects’ life cycles and IPM are key topics that life cycles and IPM are key topics that need to be understood in order to protect crops need to be understood in order to protect crops from pest insects. from pest insects