What are weeds? How do they affect crop plants? Describe biological control of weeds.

Weeds are unwanted plants that grow along with main crop plant. They take up space and nutrients meant for the main plant.

Boilogical method of weed control

1. Bioagent like insects, pathogen etc., and other animals are used to control weeds.

2. Insect and pathogens infest weeds and they either reduce growth or kill weeds.

3. Biological control method can reduce weeds but it is not possible to eradicate weeds.