草地螟幼虫饲养密度对伞裙追寄蝇寄生效率的影响  

Effects of Larval Rearing Density in Loxostege sticticalis on the Parasitic Efficiency of Parasitoids Exorista civilis

作　　者：孔海龙[1,2] 程云霞[1] 罗礼智[1] 江幸福[1] 张蕾[1] 

机构地区：[1]中国农业科学院植物保护研究所/植物病虫害生物学国家重点实验室,北京100193 [2]扬州大学园艺与植物保护学院,扬州225009

出　　处：《中国生物防治学报》2013年第3期450-454,共5页Chinese Journal of Biological Control

基　　金：国家自然科学基金(31201503);公益性行业(农业)科研专项(201303057;201003079)

摘　　要：为了明确草地螟幼虫饲养密度对伞裙追寄蝇寄生效率的影响,室内条件下(温度22℃,RH 70%,光周期16L﹕8D)对不同幼虫密度(1、10和30头瓶1)饲养的草地螟幼虫的被寄生率及幼虫对寄蝇寄生的耐受能力进行了研究。结果表明,幼虫饲养密度对草地螟幼虫被寄生率及幼虫对寄蝇寄生的耐受能力影响显著。幼虫被寄生率以1头瓶1最低、30头瓶1最高,且不同幼虫饲养密度之间差异显著。同时,随着幼虫饲养密度的增加,幼虫被寄生多粒卵的个体比例明显升高,30头瓶1的幼虫被寄生多粒卵的比例显著高于1头瓶1的。不同饲养密度下幼虫对寄蝇寄生的耐受能力与被寄生率的变化趋势不一致。被寄生幼虫的死亡率以10头瓶1最低,30头瓶1的最高,且二者之间存在显著差异。寄蝇的存活率与幼虫死亡率的变化趋势相同,10头瓶1的寄蝇存活率显著低于1和30头瓶1的。因此,幼虫饲养密度是影响伞裙追寄蝇寄生效果的重要因子之一,这些结果阐明了寄蝇寄生率与草地螟幼虫饲养密度之间的关系。To investigate the influence of rearing density of host larvae of Loxostege sticticalis on parasitic efficiency of tachinid parasitoids, Exorista civilis Rondani, parasitism rate and host tolerance were studied at three rearing densities （1, 10 and 30 larvae per jar） in the laboratory （22℃, RH 70%, photoperiod 16L ： 8D）. The results showed that parasitism rate and larval tolerance were significantly affected by larval rearing densities. Parasitism rate was the highest at the rearing density of 30 host larvae per jar and was significantly different between the three treatments. Superparasitism rate increased with larval rearing density, being significantly higher at 30 larvae per jar than at 1 larva per jar. Larval tolerance to parasitism was to the contrary of parasitism rate. Mortality of parasitized larvae was the lowest at 10 larvae per jar, which was significantly lower than that at 30 larvae per jar. Survival rate of tachinid fly at l0 larvae per jar was significantly lower than those at 1 and 30 larvae per jar. The results indicate that host larval rearing densities is one of the major factors influencing parasitic efficiency of E. civilis and clarify the relationship between fly parasitism rate and host rearing density.

关 键 词：草地螟 幼虫饲养密度 伞裙追寄蝇 寄生率 耐受能力 

分 类 号：S476.3[农业科学—农业昆虫与害虫防治]