Resurgence (pest)

This is sometimes called the “pesticide treadmill”: a term coined by Robert van den Bosch to describe a self-reinforcing over-dependence on agrochemicals and inimical to natural biological controls.

An obvious solution is to reduce or eliminate pesticide use, but where pest pressure is high (e.g. with many tropical crops), this is not always feasible: but various measures can be taken, including better timing, application and the use of less deleterious products such as biopesticides.

[3] Management of Icerya purchasi populations is a well-known early success for classical biological control, after introduction of the vedalia ladybird in the late 19th century.

[4] First generation insecticides such as DDT were often replaced by synthetic pyrethroids for agricultural and horticultural use by the end of the 1970s, due to their relatively low persistence and mammalian toxicity.

After synthetic pyrethroids applications, spider mite development is shortened, the sex ratio can becomes more biased towards females and onset of winter diapause is possibly delayed.