Question

Which is not used as a biopesticide?
A. Xanthomonas campesteris
B. Bacillus thuringiensis
C. Trichoderma harzianum
D. Nucleo polyhedro virus

Answer 1

Biopesticides are the biological pesticides that kill the pests that attack the plant but do not harm the plant themselves and help in integrated plant management. There are different types of biopesticides obtained by using synthetic and semi-synthetic methods.

Complete answer: The biopesticides are pesticides made by natural substances obtained by animals, bacteria and plants. Pesticides are used to control pests and protect plants.
-In option A, Xanthomonas campesteris is a bacterial species that infect plants. It damages plants by causing a variety of diseases. Some of the diseases include black rot in green leafy vegetables and bacterial wilt of turfgrass. This bacterium basically rots the leaves and forms blackish spots in leaves.
-In option B, Bacillus thuringiensis is a biopesticide used widely. It is used to kill the larvae of many flies and moths. It is a gram-positive bacteria that produces the toxin which slays the pest.
-In option C, Trichoderma harzianum is a biopesticide commonly used. It is used to suppress the inflectional action of fungi pathogens. Trichoderma harzianum is a fungus itself. It is added in the soil to provide treatment to soil and seed both.
-In option D, Nucleo polyhedro virus is also a biopesticide. It lies in the category of viruses. Like Bacillus thuringiensis , it is also used to assassinate the moths and flies.
Hence option A is correct.

Note: Bacillus thuringiensis , a bacterium is also used in genetic engineering. Genetic engineering is a modern technique to alter the genome of an organism to the betterment in most of the cases. They are modified and added to the plant growth medium so as to incorporate the plant with pest resistance. The plants will now have an automatic system to kill the pests themselves.