Studies on the Occurrence Regularity and Control of Archernius tropicalis

Objective:To study the occurrence of Archernius tropicalis Walker and control method.Methods: The field investigation and the controlling trial were carried out for the research.Results: A.tropicalis occurred for 4 generations annually in Xiaogan area of Hubei Province.It overwintered as larva inside thin cocoons in the litter,resumed feeding in March next year,and began to pupate in the first 10 days of April.Imagoes and eggs appeared in the second or last 10 days of April,from then to mid-June was the occurrence and injuring period of the first generation larva.Major occurrence period of the second generation larva lasted from the first or second 10 days of July to mid-August,the third generation larva appeared in the first or second 10 days of September and injuring lasted to the first or second 10 days of November,the fourth generation larva(the overwintering generation) making thin cocoons entered the overeintering period of dormancy.The result of five pesticides sold in the market against A.tropicalis in field trial showed that the controlling effect were over 92% when used in proper period.Conclusion: Archernius tropicalis Can be well controlled with the five pesticides sold in the market as long as sprayed in the injuring perido of every generation larva.