Question

Why should preventive measures and biological control methods be preferred for protecting crops​

Answer 1

Biological control methods should be preferred for protecting crops because these methods are easy to use, cheaper and also they don't harm the environment.

Example-some species of birds are left on the ground that doesn't harm the crops but eat the rodents that harm the crop.

I hope that the answer is useful to you.

Answer 2

Answer: Preventive measures ensure that the crop plants are protected from the harmful biotic factors (such as diseases, weeds and insects) and abiotic factors (such as drought and salinity). ... Hence, preventive measures & biological control methods are preferred for protecting crops.