Question

are used for control of grass weeds in cotton and rubber plantations​

Answer 1

Weedicides

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hope it helps you

Answer 2

Weeds are the unwanted plants that grow with the crops and they utilize all nutrients and minerals.

Explanation:

Weedicides or bioherbicides are used to control weeds in cotton, rubber plantations along with other plantations.

Bioherbicides: It involves the biological controls of weeds by some living organism, e.g, use of insects feeding on a specific weed or use od microorganisms which will cause diseases in weeds. The examples of herbicides used in cotton plantations are cocklebur(Xanthium strumarium), nightshade(Solanum nigrum) etc.

Weedicides:- They are the chemicals that are used to kill weeds. The examples of weedicides are glyphosate, Isoproturon etc.