摘要
研究了16～1、16～4、16～7、16～10、13～1、13～4、13～7、10～1、10～4及7～1℃(较高温度下10h,较低温度下14h)等10组二步变温下分别诱导13、16、19、22、25、28、31、34和37天后松毛虫赤眼蜂的滞育率。结果表明:二步变温、诱导时间以及二者的互作对滞育率有显著影响。13～1、13～4、13～7℃下滞育率较高,其中13～7℃下最高,为诱导滞育的适宜变温。16～10、16～7、和7～1℃不适于诱导滞育。16～1、16～4、10～1和10～4℃有中等程度的滞育诱导作用。在13～1、13～4、13～7、10～1和10～4℃的诱导下,滞育率随着诱导时间延长呈“S”型曲线增高。诱导时间达28天后,滞育率常不再显著升高。在13～7℃下诱导28天以上,滞育率可达60％～70％。
Trichogramma dendrolimi （Hymenoptera： Trichogrammatidae ） has been successfully produced in fresh caesarean-birth eggs of Chinese tussah silkworm, Antheraea pernyi, and widely used in biological control of important pests in China. To avoid the loss in production caused by unwanted diapause and develop technology for long-term storage of the parasitoid, we investigated the diapause rates of T. dendrolimi in caesarean-birth eggs of Antheraea pernyi under 10 alternating temperature regimes, i.e. 16 -1℃, 16-4℃, 16-7℃, 16-10℃, 13-1℃, 13-4℃, 13-7℃, 10-1℃, 10-4℃ and7-1℃ combined with 9 different exposure times, i.e. 13, 16, 19, 22, 25, 28, 31, 34 and 37 days at each of temperature regimes. A temperature regime of 16℃ for 10 hours and 1℃ for 14 hours each day is indicated by ＂ 16 - 1 ℃＂ The results from the experiments indicated that temperature, exposure time and their interactions had a significant influence on diapause rates of the parasitoids. 13 -7℃, 13 -1 ℃ and 13 -4℃ were the optimum temperature to induce T. dendrolimi into diapause. 16 -1 ℃, 16-4℃, 16 -4℃ , 10 -1 ℃ and 10 -4℃ had moderate effect on the diapause induction. While 16 -10℃, 16 -7℃ and 1-7℃ were not effective temperatures for diapause induction. Under effective alternating temperature regimes, the diapause rate increased as exposure time increased. However, when exposure time increased to more than 28 days, diapause rate did not increase significantly with exposure time. Sigmoid models were developed to describe relationships between diapause rate and exposure time at 10- 2℃, 10-4℃,13-1℃, 13-4℃ and 13-7℃, respectively. High diapause rates, e.g. 60%-70%, were obtained by inducing at 13 -7℃ for over 28 days.
出处
《植物保护学报》
CAS
CSCD
北大核心
2005年第2期174-178,共5页
Journal of Plant Protection
基金
科技部天敌昆虫种质资源平台项目"2003DEA3N02905"
