Question

why should preventive measures and biological controls methods be preferred for protecting crops

Answer 1

HEY MATE HERE IS YOUR ANSWER

preventive measures and biological control method should be preferred for protection of cross because they are ecological safe target specific and harmless to other life forms biological control of weeds involve the excessive use of insects or some other organisms which consume and destroy the weed plants.

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Answer 2

It is important bcoz weeds , insects , micro organisms , etc . can attack the crop and can cause failure .....

weeds are protected by hand , weedicides
insecticides can also be used ...