In India, the spread of Opuntia was controlled by

In India, the spread of Opuntia was controlled by

Options

(a) introducing insects
(b) spraying D.D.T.
(c) letting loose cattles
(d) growing trees

Correct Answer:

introducing insects

Explanation:

The control of pests by biological (rather than chemical) means is achieved by breeding disease-resistant crops or by introducing a natural enemy of the pest, such as a parasite or predator, e.g. control of the prickly pear cactus (Opuntia) was done by introducing the cactus moth (Cactoblastis, Cactorum) whose caterpillars feed on the growing shoots of the plants.

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