Question

why should preventive measures and biologiacl control methods be preferred for protecting crops​

Answer 1

ANSWER

Preventive measures and biological control methods should be preferred for protecting crops because these methods are safe ecologically and do not harm other life forms.  

Excessive use of chemicals can lead to many environmental problems and cause pollution. They can also enter the food chain and cause serious health hazards.  

Biological control methods involve the use of biological organisms and hence, these are completely safe for other life forms.

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Answer 2

Answer:

Diseases in plants are caused by pathogens. To get rid of pathogens, some preventive measures and biological control methods are used as they are simple, economic and minimise pollution without affecting the soil quality.