The correct options are
A Trycoderma
B Bacillus thuringiensis
∙ Biological control methods implement predatory insects as well as several micro-organisms which destroys the pests population on crops.
∙ Micro-organisms like Trychoderma bacterium, Bacillus thuringiensis, etc., destroys pests. Whereas, stem borers and tungro viruses are infectious to the crops.