1.

What is biocontrol? Name the principle behind biological method of pest control. Mention examples of bio control agents and their function.

Answer»

It is the use of micro organisms to control or eliminate insect pests. The micro organisms employed in biological control are called bio control agents. 

Principle 

It is based on prey – predator relationship. 

Examples 

1. Ladybird and Dragon flies useful to get rid of aphids and mosquitoes. 

2. Bad llus thuringiensis (Bt) is used to control butterfly caterpillar. Spores available in sachets are mixed with water and sprayed on plants, eaten by insect larva, toxin released in gut kills larvae. 

Example: Bt toxin genes are introduced into cotton plants and made resistant to insect pests such as cotton boll worms, stem borer, aphids and beetles. 

3. Nucleo polyhedrovirus ( NPV) is a virus suitable for narrow spectrum insecticide applications. It has no negative impacts on plants, mammals, birds, fish or target insects. It is suitable for overall integrated pest Management programme (IPM) in ecologically sensitive areas.



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