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Which one of the following is an example of carrying out biological control of pests/diseases using microbes

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Which one of the following is an example of carrying out biological control of pests/diseases using microbes
A. Nucleopolyhedrovirus against white rust in Brassica
B. St-cotton to increase cotton yield
C. Lady bird beetle against aphids in mus- tard
D. Trichoderma sp. against certain plant pathogens
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Trichoderma are free- living fungi and are effective biocontrol agent of several plant pathgens. Azotobacter is a free living nitrogen fixing bacteria.Many members of genus Glomus form mycorrhiza. Aspergillus is the common green mould beloging to the ascomycetes.
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