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Entomology
Definition and types of Repellents 
Entomology

Definition and types of Repellents 

Musa June 11, 2018

Contents

  • 1 Definition and types of Repellents 
    • 1.1 Definition of Repellents 
    • 1.2 Types of repellents
      • 1.2.1 A. Physical repellents
      • 1.2.2 B. Chemical repellents

Definition and types of Repellents 

Definition of Repellents 

The chemical which causes insect to make oriented movements away from its source is  known as repellents. Repellents usually substances with a strong smell, act in the opposite  way by keeping pest away. Dethier  (1947)  has  defined,  repellents  as  those  substance  whose  stimuli  elicit  avoiding  reaction. Repellents are chemicals, prevent insect damage to plants or animal by rendering them  unattractive, unpalatable or offensive.

Types of repellents

There are two group of repellents which are

A. Physical repellents

Physical repellents are water, dust, waxes, granular, oils, sound,  smoke, heat, air current, movement of fan etc.

B. Chemical repellents

Oil of citronella and oil of camphor are widely used as mosquito  repellents. Spraying of Bordeaux mixture comprising cupper sulphate and lime repels leaf  hopper, fruit fly and some chewing insects. Dimethyl phthalate, β­naphthol, Benzyl benzoate  etc. are used against mites. Diethyl toluidine provides protection against mosquitoes, ticks and  fleas. Phenol is extremely used to drive bees from the hive. Besides, benzaldehyde, propionic  anhydride, acetic acid etc. are also used to drive honey bees. Other cosmetically acceptable  repellents in the form of cream, foam, lotions etc. are used to drive mosquitoes.

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About The Author

Musa

I'm studying plant pathology. I have completed my Bachelor of Science in Agriculture degree.

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