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  Biopesticides

Biopesticides:

Biological agents which are employed for control of insects, weeds and pathogens generated from living organisms are known as bio pesticides. Micro-organisms like viruses, bacteria, fungi, protozoa and mites might be employed as biopesticides.

Bio control of insect pests:

1. The producer of methyl isocynate (MIC) was started in the year 1980 to build Serin (carbaryl), a powerful pesticide which can kill in excess of 100 types of insects attacking 100 diverse crops.

2. Several of the chemical pesticides, which are employed to control various crop pests as well affects the beneficial organisms.

3. Majority of microorganisms like viruses, fungi, bacteria, protozoa and mycoplasma are identified to kill insect pests. The appropriate preparations of such type of microorganisms for control of insects are known as ‘microbial insecticides’. These are non-hazardous, non-phytotoxic and are careful in their action. They are eco-friendly not accountable for environmental degradation. The most often employed bio-control agent is Bacillus thuringiensis and Pyrethrum that extracted from the inflorescence of Chrysanthemum belonging to Asteraceae.

Bacterial pesticides:

B. thuringiensis is an extensively spread bacterium. B. thuringiensis is a saprophytic bacterium and could be isolated from litters, soils, and dead insects. B. thuringiensis is a spore-forming bacterium and produces various toxins like exotoxins and endotoxins in crystallized forms.The bacterium are injurious to lepidoptera insects. Later than the infection of spore, larvae are damaged because of the secretion of a single large crystal in the cell. This crystal (toxin) is proteinaceous in nature.

 

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