복숭아혹진딧물에 기생하는 목화면충좀벌의 발육단계별 온도영향

Abstract

Developmental period, mummification, pupal mortality, and sex ratio of Korean strain of Aphelinus varipes Forster parasitizing the green peach aphid, Myzus persicae were studied at 20, 25, 30, and 35℃ in controlled climate cabinets. The plastic container with a leaf disc of sweet pepper (Capsicum annuum L.) was used as experimental units. Green peach aphids at different developmental stages were reared in four different temperatures and presented to A. varipes for 12 hours. A female adult of A. varipes was allowed to parasitize for 12 hours in each plastic petri dish. The periods from egg to adult of A. varipes were 18.3 days, 14.7 days, 10.4 days, and 9.3 days at 20℃, 25℃, 30℃, and 35℃, respectively. The pupal mortalities of A. varipes were 0%, 1.5%, 2.8%, and 10.2% at 20℃, 25℃, 30℃, and 35℃, respectively. The mummifications of A. varipes were significantly different in all developmental stages of the aphid. The mummification of A. varipes parasitizing green peach aphid was the highest at 1st and 2nd in 20℃ and 25℃, but the highest at 3rd (84.4?85.0%) in 30℃ and 35℃. The host feedings of A. varipes were 20℃ (12.5%), 25℃ (17.3%), 30℃ (16%), and 35℃ (10.9%), respectively. The sex ratios of A. varipes female were 20℃ (49%), 25℃ (46%), 30℃ (69%), and 35℃ (60%), respectively.