关键词: 潜蝇姬小蜂, 美洲斑潜蝇, 营养, 寄主取食, 寄生率, 致死能力

Abstract:

 In order to investigate the host-feeding behavior of Diglyphus isaea (Walker), the oviposition behavior and the trade-off between the two behaviors in different nutritional status, we compared the influences of the parasitism, host-feeding and the lethal capability of female D. isaea on Liriomyza sativae Blanchard larvae that were supplied with the distilled water (hungry), diet with honey and that without honey, respectively. The results showed that under the condition of no-choice, parasitoids in the three kinds of nutritional status had higher parasitism rate on the late instar larva, higher feeding rate on the mid-instar larva, and the mortality and the lethal capability had significant difference. Parasitoids in the three kinds of nutritional status had no lethal capability to the early instar larva. Under the condition of choice, the hungry parasitoids had the lowest parasitism rate (5.0%±1.6%) and the highest feeding rate (16.0%±2.9%), especially the feeding rate of the late instar larvae amounted to 91.9% of all instar larvae. When honey were supplied, the feeding rate (8.3%±0.9%) and the mortality (17.7%±1.1%) of the parasitoid was the lowest; however, its parasitism rate (13.3%±1.1%) and the mortality (28.4%±1.8%) were the highest when no honey was supplied. In conclusion, the parasitoids feeding hosts have stronger lethal capability than those feeding honey, and the parasitoids supplied with host food have stronger activity than those not supplied with host food.

Key words: Diglyphus isaea, Liriomyza sativae, nutrition, host feeding, parasitism rate, lethal capability