The fish used for the control of malaria is ......... .

Given below are two statements.
Statement $I$: Baculoviruses are pathogens that attack nematodes.
Statement $II$: Baculoviruses are used as biological control agents in ecologically sensitive areas as they are species-specific in their action.
In the light of the above statements, choose the correct answer from the options given below.

What do bionematicides control?

What type of fungus is $Trichoderma$?

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

What is the main difficulty in the biological control of pests?