Hymenopterous parasitoids like Ichneumonids, Braconids are very potential biocontrol agents hence, used in biological pest control at global scenario including India. Biological pest control is very good alternative for chemical control. The book will be stimulatory and helpful to students, scientists and workers in biological pest control. The book covers many recent advances pertaining to research on Agricultural crop plants. The useful information is provided on the marks of identification, life cycle, damage, hosts and various control measures agriculture crop pests. The book also provides rearing technique for pests and their biocontrol agents (parasitoids). As biological pest control is an integral part of pest management, emphasis is given on pest parasitoid interactions and pest parasitoid crop interactions. Many agriculture pests have developed the resistance against several insecticides. Although insecticide use leads to serious problems like secondary pest out-break, pest resurgence, interruption in ecocycles, air and water pollution, health hazards, killing of beneficial insects, etc. The knowledge of pest parasitoids will facilitate the control of agricultural pest.