How are pests controlled in a crop field?

What are weeds ? Give different methods of controlling weeds in a crop field.

What type of insect pests are found in our crop fields ? Name any three of them.

Babanrao is an organic farmer growing ladyfingers in this field. What are the precautions he will take to control pests in his field ? I. Use of ladybird and dragonflies to control butterfly cartepillars . II. Use of Nucleopolyhedrovirus to control arthropods . III. Use of Bacillus thuringiensis to control butterfly caterpillars . IV. Use of Trichoderma to control arthropods .

What will happen if the weeds are not removed from the crop fields?

The phenomenon of using a predator for controlling a pest is

Statements: All crops are fields No yields is a field All fields are harvests. Conclusions: I. No field is a crop II. All crops being harvest is a possibility

Assertion : Intercropping checks the population of insects. Reason : Plant pests can be controlled biologically by their natural parasites and pathogens.

For what purposes the chemical fertilizers are used in crop fields ?