角蜡蚧产卵量与卵期预测预报的研究

角蜡蚧是雪松等园林树木的重要害虫之一，产卵多、繁殖强、危害重，准确测报其发生量与若虫孵化期，是防治成败的关键。通过１９９７年５月对产卵末期雌虫体质量、体长及产卵量的测定与室内变温、恒温饲养研究，其平均虫体质量ｘ１＝０．１１０３±０．０８４９ｇ，体长ｘ２＝７．０２７±０．２０２ｍｍ，产卵量（ｙ）＝４８８０．５±４４４０．５３粒；产卵量与虫体质量、体长相关方程式分别为：ｙ１＝－５７１．２５＋５００７８．３ｘ１，ｒ１＝０．９７１９＞ｒ０．０１＝０．４９６；ｙ２＝－１０３５６．４６＋１９８３．３９ｘ２，ｒ２＝０．８４３６＞ｒ０．０１＝０．４９６。卵发育起点温度：Ｃ＝１０．２５±１．５３℃或Ｃ＝９．９４±０．１９℃；有效积温Ｋ＝１６５．１５±６．９６ＤＤ或Ｋ＝１４１．５１±２．１５ＤＤ。经应用及检验与实际符合。

Study on Forecast of Ovipositing Amount and Occurrence Time of Ceroplastes ceriferus

Ceroplastes ceriferus (Fabricius) is one of the most serious pests of Cedrus deodara (Roxb.) Loud and other garden trees.In order to control the pest,its is very important to forecast accurately amount and abounding in incubation period of nymph.In 1997,by studying on weight,length ovipositing amount of the latter and feeding in condition of various and constant temperature in Hefei,results were as follows:the mean weight x1 =0.110 30.084 9 g,the length x2 =7.0270.202 mm,oviposinting amount y =4 880.54 440.53.There were relations between ovipositing amount and weight and length.Detail regression equations were respectively y1 =-571.25 50 078.3x1,r1=0.971 9;y2 =-10 356 1 983.39x2,r2=0.843 6.The initial temperature for the period of development of the egg C and effective accumulated tempterture K were found.They were C=10.251.53 or C=9.940.19 and K=165.156.96 DD or K=141.512.15 DD.Based on those parameters,the forecast is quite successful.