1.Concept of Agri.Entomology *Many pests can damage crops growing in fields. Stored crop grains,harvested after crops are grown,can be damaged by pests. *Pests can mainly be divided into 6 categories: Crop diseases Pest insects Weeds Rats Birds Beasts (e.g.wild boar 3 1. Concept of 1. Concept of Agri. Entomology . Entomology ™Many pests can damage crops growing in fields. Many pests can damage crops growing in fields. ™Stored crop grains, harvested after crops are Stored crop grains, harvested after crops are grown, can be damaged by pests. grown, can be damaged by pests. ™Pests can mainly be divided into 6 categories: Pests can mainly be divided into 6 categories: Crop diseases Pest insects Crop diseases Pest insects Weeds Rats Weeds Rats Birds Beasts (e.g. wild boar Birds Beasts (e.g. wild boar)