【摘要】 本工作于1959—1960年在浙江黄岩桔区进行。文中对柑桔花蕾蛆的形态作了扼要的描述和学名的订正。此虫一年发生一代,成虫在4月上旬开始羽化,幼虫有三个龄期,第1龄期3—4天,第2龄期6—7天,第3龄期最长,老熟后落土,在土中呈休眠状态,一直保持到来春。防治方法可采用地面施药,控制成虫羽化出土,经多种考核防治效果比树冠施药理想,并通过试点证明成效显著。更多还原

【Abstract】 The citrus blossom midge,Contarinia citri Barnes,is a serious pest of citrus.The larvaelive upon the flower organ of citrus and prevent its normal pollination and development.Theyield of the infested citrus will suffer a considerable loss.This work was conducted in 1959 to 1960 in Hwangyan,Chekiang province.The presentpaper deals with the identification,life-cycle and behaviour of this midge.The control mea-sures are also briefly discussed.This midge occurs once a year.The adult appears in early April.The egg stage lasts3-4 days.Three larval instars may be recognised:the first instar lasts 3 to 4 days;the second,6 to 7 days;and the third,reaching full-grown and falling to the soil in which it enters intodiapause in a thin elliptical cocoon,remains there until the next spring.In the middle ofMarch,the larvae resume their activity and gradually move to the surface of soil to pupate.Pupal stage lasts 8 to 10 days.With a view to preventing the emergence of adult,soil dressings with an emulsion of25% DDT(1.5 Ibs./’mu’)and 0.5% γ-BHC dust(5 Ibs./’mu’)had been tested.During theflight season spraying the trees with the same toxicants was also tested.It shows that soildressing with the said toxicants is evidently better than the customery spraying in reducingthe demage.Furthermore,the former is more practical and more easily handled than thelatter.更多还原