皱基盘绒茧蜂的寄生特性及发育历期OA

[Objective]To evaluate the control effect of Cotesia tibialis on Discestra trifolii,[Methods]parasitic effect of Cotesia tibialis on Discestra trifolii larvae of different instars,time taken for oviposition and cocoon number in single host of Cotesia tibialis were observed in the laboratory.Developmental period of Cotesia tibialis was also determined at different constant temperature,and developmental threshold temperatures and total effective temperatures of developmental periods of Cotesia tibialis were calculated by linear regression method.[Results]The results showed that the cocooning rates of 3rd,4th and 5th larvae of Discestra trifolii parasitized by Cotesia tibialis were 15.1%,49.2%and 27.8%,and the mortality was 81.1%,44.3%and 44.4%,respectively.The time of single successful parasitism of Cotesia tibialis was distributed between 4 s and 74 s,with an average of(13.2±0.7)s.After a single parasitism,it could produce 1 to 107 cocoons per host,with an average of 42.4±1.8.The developmental periods of different developmental stages(egg to cocoon,cocoon to adult,and egg to adult)were shortened with the increase of temperature.The developmental threshold temperature from egg to cocoon,cocoon to adult,egg to adult were(10.91±1.45)℃,(9.25±2.37)℃and(9.93±0.44)℃,respectively.The total effective temperature from egg to cocoon,cocoon to adult,egg to adult were(145.01±15.19)℃·d,(96.93±14.92)℃·d and(249.04±7.38)℃·d respectively.[Conclusion]The results provide a scientific basis for controlling Discestra trifolii by using Cotesia tibialis in the field.