A gardener applied heavy doses of the same insecticide to his garden for two consecutive years to kill squash bugs. During the third year, the man called in an expert to explain why he had an abundance of new pests that were destroying her garden. The expert explained that the abundant new pests were largely due to his previous use of a insecticide in a phenomenon known as
(a) pesticide resistance
(b) secondary-pest outbreak
(c) triennial pest emergence
(d) bounce back resurgence
