Opuntia weed can be eradicated by

Gambusia

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cochineal insect

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grass carp

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both (a) and (b).

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Solution

The correct option is B cochineal insect
The cochineal insect are introduced into the (Opuntia) prickly pear. The insect destroy the weeds without harming the crop plants. Its one of the biological method as well.

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