文献类型： 外文期刊

作者： Liu, B ¹ ; Sengonca, C ¹ ;

作者机构： 1.Fujian Acad Agr Sci, Inst Plant Protect, Fujian 350003, Peoples R China

期刊名称：ANZEIGER FUR SCHADLINGSKUNDE PFLANZENSCHUTZ UMWELTSCHUTZ （ 影响因子：0.195； ）

ISSN： 0340-7330

年卷期： 1998 年 71 卷 3 期

页码：

收录情况： SCI

摘要： The present study dealt with the functional responses of the parasitoid, Eretmocerus longipes Compere (Hym., Aphelinidae) to the densities of the whitefly, Aleurotuberculatus takahashi David et Subramaniam (Hom., Aleyrodidae) at different temperatures under the laboratory conditions. The results showed that when the initial densities of A. takahashi-3rd instar were raised from 10 to 320 ind./leaf, the numbers of parasitized nymphs increased as well, ranging from 7.0 to 23.1 at 20 degrees C, 9.8 to 42.9 at 25 degrees C, 6.7 to 39.9 at 30 degrees C, and 1.8 to 8.3 ind./leaf at 35 degrees C, respectively. The Holling Disk Equation was introduced to build up the models of functional responses. The response curves remained type II, although the numbers of parasitized nymphs were significantly different under different temperatures. The suitable initial densities of the host whitefly for parasitization were about 80 individuals per leaf. A negative relation was observed between the initial densities of the whitefly and the parasitization rates by the parasitoid. An increase in the initial densities of A. takahashi-3rd instars ranging from 10 to 320 ind./leaf resulted in a decrease in the parasitization rate by E. longipes ranging from 70.0% to 7.2% at 20 degrees C, 98.0% to 13.4% at 25 degrees C, 67.0% to 12.5% at 30 degrees C and 18.0% to 2.6% at 35 degrees C, respectively. The searching rate (a) of E. longipes at 35 degrees C with a value of 0.2877 was significantly smaller than that at 20 degrees C with a value of 1.3354, that at 25 degrees C with a value of 1.6465 and that at 30 degrees C with a value of 1.1199, respectively (p<0.01). The handling time (Th) for E. longipes was 0.1521 at 35 degrees C, significantly longer than 0.0510 at 20 degrees C, 0.0289 at 25 degrees C and 0.0320 at 30 degrees C, respectively (p<0.01). The maximum loading number (K) of the parasitized nymphs with a value of 34.5 ind./leaf at 25 degrees C was similar to that with a value of 31.2 ind./leaf at 30 degrees C, about 1.8 times as high as that with a value of 19.6 ind./leaf at 20 degrees C and 4 times more than that with a value of 6.6 ind./leaf at 35 degrees C. It was suggested that temperature affected the functional response by balancing searching rate and handling time. The optimal temperature range for the functional responses of E. longipes to the densities of A. takahashi-3rd instar was 25 degrees to 30 degrees C.