Which one of the following is an example of carrying out biological control of pests/diseases using microbes?
(1) Bt-cotton to increase cotton yield
(2) Lady bird beetle against aphids in mustard
(3) Trichoderma sp. against certain plant pathogens
(4) Nucleopolyhedrovirus against white rust in Brassica

i have doubt between 1st and 3rd options as both can come..so pls tell correct answer

Dear student, 
Please find below the solution to the asked query 

Trichoderma sp. against certain plant pathogens is an example of carrying out biological control of pests/diseases using microbes. Hence option (3) is correct.

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