4. Discussions
4.1. Relationship between activities changes in detoxification enzymes
and insecticide resistance
Enhanced capacities of detoxification enzymes related to insecticide
metabolism are one of the major mechanisms that insects
use to produce pesticide resistance. Many studies had shown that
the multi-function oxidases participate in insecticide metabolism
to promote serious insecticide resistance in the insects. For example,
the resistance of bollworms to pyrethroid insecticides was
mainly caused by the increased MFO activities [21]; and the increase
in GST activities was also the major factor in the production
of resistance to pyrethroid and nereistoxin insecticides in diamondback
moths (Plutella xylostella) [21]. The study of Wirth