2001•Kunchong zhishiRequires access
The effective overwintering numbers from the 6th instar larvae of cotton bollworm
Yan Ping Ding, Xue Wang
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Abstract
The pupation rates and emergence rates of adults from the 4th generation cotton bollworm were studied in corn field and cotton field of Northern China.The results showed that the 65%～83.05% of pupation rates and 10%～87% of emergence rates of adults from the 6th instar larvae were found in cotton field, and the 55%～80% of pupation rates and 13%～77% emergence rates of adults in corn field.No significant difference was observed in cotton field and corn field by t test.Because only the diapaused pupa can overwinter safely and develop to adults in next year, the effective overwintering pupae of the 4th generation cotton bollworm come mainly from the 6th instar larvae during were taken part in August 31 to September 10 in fields. The effective overwintering number of pupae in contton field was higher than that in corn field.