The use of insect growth regulators (IGRs) in flea control targets which life stage?

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Multiple Choice

The use of insect growth regulators (IGRs) in flea control targets which life stage?

Explanation:
IGRs interfere with the growth and development of the immature flea stages. They mimic hormones that control metamorphosis, so they prevent progression from one immature stage to the next. In flea control, this means eggs are prevented from hatching or larvae from maturing, which stops the life cycle before adults emerge. Because of this focus on stopping development at the start of the life cycle, the egg stage is the one most directly targeted by IGRs. Adult fleas are not killed by these products, and pupae are less affected, which is why the egg stage is the best answer.

IGRs interfere with the growth and development of the immature flea stages. They mimic hormones that control metamorphosis, so they prevent progression from one immature stage to the next. In flea control, this means eggs are prevented from hatching or larvae from maturing, which stops the life cycle before adults emerge. Because of this focus on stopping development at the start of the life cycle, the egg stage is the one most directly targeted by IGRs. Adult fleas are not killed by these products, and pupae are less affected, which is why the egg stage is the best answer.

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