One reason was that the insects developed a resistance to the product. Suggest another reason using knowledge about populations, food chains, predators and competitors.
2007-10-24 10:34:53 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Botany
If you kill the beneficial predator along with the insect pest there can be a rebound due to less predation. When pesticides kill the insects all populations are depressed. The first to recover are the prey species. As their numbers come back they are not held in check by their usual predators. This can lead to more of a pest species than if unsprayed.
2007-10-24 11:31:18 · answer #1 · answered by gardengallivant 7 · 0⤊ 0⤋
above answer is a good one. additionally, target spraying can sometimes decimate a pest population more than any potential competitiors. without competition and predation, a pest has nearly unlimited potential.
2007-10-26 02:07:07 · answer #2 · answered by ulri6129 3 · 0⤊ 0⤋