How does resistance to chemical pesticides develop in pests and diseases?
Chemical pesticides generally only have one ‘active ingredient’. If the same chemical pesticide is applied too frequently – the pest or disease has the opportunity to develop ways to deactivate the pesticide’s chemical pathway. As the number of resistant pests and disease spores increase – resistance develops in a ﬁeld population.
See: www.frac.info and www.irac-online.org