Mechanisms on pesticideinduced resurgence of pests
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Key Words：pest resurgence, ecological mechanism, physiological mechanism
Abstract： Pest resurgence is a common outcome of pest control. This phenomenon includes both ecological and physiological resurgence. Ecological resurgence is attributed to pesticides weakening natural control systems whereas physiological resurgence refers to pesticide-induced stimulation of pest reproduction or hormesis. Recent investigations show that physiological resurgence is due to the activation of the RNA transcript level in fat bodies, which results in a significant up-regulation of vitellin expression. In addition, pesticides can not only stimulate reproduction in males, but can also be transferred to females via mating. Therefore, pesticideinduced stimulation of males is an important mechanism of pest resurgence. However, the resurgence of pests in natural populations is affected by the integrated effects of multiple factors.