Identification and control methods for the copper-green chafer

[Control methods]

(1) Controlling adults

The adults of the above several species of chafers all have the habit of supplementary feeding, mainly feeding on the leaves of trees, fruit trees, legumes and other crops. On young fruit trees, manual control can be used to capture adults to reduce damage.

(2) Chemical control

2.5% trichlorfon powder can be used, broadcast at 30 kg per hectare on field crops. 40% dimethoate or omethoate emulsifiable concentrate at 1000 times dilution, or 20% fenvalerate at 3000 times dilution can also be sprayed on fruit trees, forest trees, etc. In places where the black chafer (Holotrichia parallela) occurs severely, the poisoned-branch trap method can be used for chemical killing. Cut branches of elm, poplar and other trees (about 50-70 cm) and insert them into 40% monocrotophos emulsifiable concentrate at 50 times dilution, soak for more than 10 hours, and insert them in the field in the evening, 75 branches per hectare.

(3) Controlling larvae See wireworms. In addition to chemical control, biological control can also be used. Natural enemies of white grubs are abundant; parasitic natural enemies include the scoliid wasp, with a parasitism rate reaching 48%, and there is also Milky Disease bacteria that parasitize white grubs. The Lu Milk No. 1 strain has been isolated and screened, applied into the field at sowing, with a control efficacy of 70%.