The insect world is includes both helpful as well as harmful organisms. Insects that consider to be harmful which accomplish negative impact for the ecosystem including destroying crops, building structures, infestations, delivering painful, poisonous, venomous bites, nuisance to house hold products, irritate human skin, causing blisters, painful sting injury, wood damage, garden destruction, cloth and book damage and even vector for disease transmission etc. A minority of insects are considered pests because they are harmful to humans or other animals too. Insects can be harmful because of some can sting, bite, or even spread disease. Bees and wasps can sting and for those who are allergic, these stings can be even dangerous and deadly. Bed bugs, mosquitoes, horseflies, yellow flies, fleas, tsetse flies, lice, and other such insects feed on humans and other animals, which can sometimes leave or inject deadly germs into our blood stream that can cause serious illness and even death too. Insects that are often bothersome in houses of people include mosquitoes, ants, termites, flies, cockroaches, and tiny moths that can destroy our clothes.

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Dr. Mahendrasinh V Dabhi is working as Assistant Professor at S M C Polytechnic in Agriculture under the Unit B A College of Agriculure, Anand Agricultural University, Anand. He taught the students for the entomology subjects,guiding the PG student [M.Sc. (Agri.) entomology], research, extension work. He has published more than 13 research papers.