Although Chemical pesticides are largely used all over the world, they have many negative impacts. Some of the negative impacts of chemical pesticides are:

Development  of  resistancy in  insect: Pests  have  innate  capacity  of  enduring pesticide and escaping the lethality. The moment of a certain insect should this capacity which is called pesticide resistant. Continual exposure and intensity of pesticide induce the target pest to develop a resistance generation.

Outbreak of pest: Mass destruction of the natural enemies due to pesticide influence also creates a congenial environment for major and minor pest.

Hazard of pesticide residue: Depending on the inherent nature of the chemical build-up of a pesticide it depletes its toxicity in time. Before they given up their toxicity due to environmental weathering factors, these chemical left over persist becoming a potential hazard.

 Environment Pollution:   Hardly one half of the treated pesticide deposits itself on the treated surface the rest is disseminated to uncharged areas. This make the environment polluted. They remain in water, soil, air and mammal adipose tissues for a long time and may cause long lasting time.

Phytotoxicity: Depending on the nature of pesticides plants may be harmed because of chemical interactions among plants and pesticide. Burning spot on leaves, distorted leaves, restricted growth and other undesirable symptoms are seen in plants.

Adverse effect on non-target organism:     Use of pesticide against target pests affects insect parasitoids and predators, honeybee, other pollinators and wildlife also, which cause the loss biodiversity. Repeated use of pesticides on crop has disruptive effects on beneficial insects like pollinators, bio-control agents, soil wild and aquatic life. Many invertebrates take up pesticide from soil into their bodies and may concentrate pesticides several times greater in their tissues  than  those  in  the  surrounding  soil.  Soil microorganisms which cause breakdown of  cellulose,  nitrification,  turn-over  of  organic  matter  and  other biological materials may also be adversely influenced by pesticides.  Indiscriminate use of insecticides on the field crops has resulted in widespread mortality of honeybees and wild bees which are essential for pollination.