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- 1. MICROBIAL INSECTICIDE BY M.THASBIHA SHEEREEN BIOTECHNOLOGY BON SECOURS COLLEGE FOR WOMEN
- 2. MICROBIAL INSECTICIDE Microbial insecticides are single celled organisms such as bacteria, virus,fungi,protozoan and nematodes. Microbial insecticides are those micro organisms or their products that are capable of attacking and killing pest insects.
- 3. The available microbial insecticides are prepared from Bacillus thuringiensis ,Baculo virus. They applied as conventional insecticidal sprays, dusts,liquid drenches, liquid concentrates, wettable powders or granules. They are essentially non toxic and non pathogenic to wild life, humans and not closely related to target pests.
- 4. BACILLUS THURINGIENSIS Bacillus thuringiensis was discovered by ishiwatari in 1901 in diseased silkworms . Bacillus thuringiensis(bt) is a natural occurring soil borne bacteria and since 1950 it is used as a natural insect control.
- 5. TARGET PESTS OF BACILLUS THURINGIENSIS Source from slide share.net
- 6. STRAINS OF BACILLUS THURINGIENSIS
- 7. . Bt genes are engineered into plants to make crop resistant to insects . “Bt toxin” produces a protein that is toxic to specific insects . Bt toxin were produced to kill like insects such as caterpillars,potato beetles,cabbage worms,moth,butterflies,mosquito and Black fly.
- 8. MODE OF ACTION There are many bt proteins but there mechanism of action are similar , Bt protein is absorbed by insect specific receptor in tha lining of gut. The activated proteins form a complex Which bores into the gut of the insect Causing the content of the gut to spill out .This eventually kills the insect.
- 9. Mechanism of protein in insect Mechanism of bt protein in insects
- 10. ADVANTAGES The use of insect resistant Bt plants can potentially reduce use of chemical insecticidal sprays, which are extremely toxic and expensive. It will not Kill beneficial insects such as honeybees and other pollinator. The advantage of bt is that its nontoxic to humans and wildlife or pets.
- 11. DISADVANTAGES Many strains are susceptible to the sunlight and their potency will degrade within a week. Some strains used on leaf beetles Can become ineffective within 24 hours. The optimal storage conditions for bt products were cool,dry air and out of sunlight.