why should preventive measures and biological control methods be preffered for protecting crops
Answers
Preventive measures and biological control methods should be preferred for protecting crops because excessive use of chemicals leads to environmental problems.
These chemicals are also poisonous for plants and animals. Preventive measures include proper soil and seed preparation,
timely sowing of seeds, inter cropping and mixed cropping, usage of resistant varieties of crops, etc.
On the other hand, biological control methods include the usage of bio-pesticides that are less toxic for the environment.
An example of bio-pesticides is Bacillus thuringenes, which is an insect pathogen that kills a wide range of insect larvae.
Therefore, both preventive measures and biological control methods are considered eco-friendly methods of crop protection.
Answer:
Preventive measures and biological control methods be preffered for protecting crops because if pesticides are sprayed more than their requirement then they can enter the food web and also all these pests cause pollution to the environment.