The occurrence of Caloptilia sp. and its control.
The ecology and control of the gracillariid Caloptilia sp. attacking leaves of Acer truncatum and A. mono was studied in Beijing, China, in 1981-83. The morphology of its adults (summer type and overwintering type), larvae and pupae were described. There were 3-4 generations a year and adults overwintered among the roots of grasses. The eggs were laid in the first 10 days of April near the main veins of the leaves. Pupation occured in the middle of May. The adults of the 1st, 2nd, 3rd and 4th generations peaked in the beginning of May, the middle of July, the middle of September and the middle of October, respectively. Numbers were highest in the 1st generation and lowest in the 4th. The 2nd generation caused the most serious damage. Five parasites of Caloptilia sp. were identified, and ants and spiders were observed feeding on the pest. Effective control of Caloptilia sp. was achieved with phoxim, malathion, omethoate, fenitrothion and DDVP [dichlorvos] at 1:1000; phoxim was the most effective of these insecticides.