Improvement in Food Resources — Science STD 9 — Question

1. Mechanical methods: These include uprooting, weeding with trowel or khurpi, hand hoeing, interculture, ploughing, burning and flooding.

2. Cultural methods: This includes the proper bed preparation, timely sowing of crops, intercropping and crop rotation.

3. Chemical methods: Herbicides and weedicides are sprayed on weeds to destroy weeds like- 2, 4 - D.

4. Biological methods: Biological method of weed control involves the deliberate use of insects or some other organisms which consume and specifically destroy the weed plants.

Example: Opuntia can be controlled by using cochineal insects in Maharashtra.