【摘要】 通过限制选择和自由选择试验,研究松粉蚧抑虱跳小蜂(Acerophagus coccois Smith)在扶桑绵粉蚧(Phenacoccus solenopsis Tinsley)的1~3龄若虫与雌成虫体上的寄生及其子代生长发育情况。结果表明:在限制选择和自由选择的2种试验中,松粉蚧抑虱跳小蜂均可寄生扶桑绵粉蚧的1~3龄若虫和雌成虫,其中对2龄若虫的寄生率最高,分别是41.20%和45.00%;对粉蚧雌成虫的寄生率最低,但每头僵蚧平均羽化出蜂数最多,分别为9.42头和7.00头,子代雌蜂比例也最大;子代雌蜂在粉蚧1龄若虫体内发育的历期最长,为14.62 d;在粉蚧雌成虫上发育的历期最短,为13.97 d;在粉蚧1龄若虫体内发育的子代蜂的个体最小,在粉蚧雌成虫上发育的子代蜂个体最大。因此,利用松粉蚧抑虱跳小蜂防治扶桑绵粉蚧,应以粉蚧2龄若虫为防治对象,以粉蚧雌成虫为繁殖寄主。更多还原

【Abstract】 Non-choice and choice parasitic experiments of Acerophagus coccois Smith(Hymenoptera: Encyrtidae)on the 1st-3rd instar nymphes and female adult of Phenacoccus solenopsis Tinsley(Homoptera: Pseudococcidae)were carried out in the laboratory.Host age preference and development of the offspring were evaluated.The results showed that,all 1st-3rd instar nymphes and female adults of the mealybug were susceptible to parasitism in both non-choice and choice situation,while the parasitism on the 2 nd instar nymph was 41.20% and 45.00%,respectively,which was significantly higher than those of the others.The lowest parasitism was observed on host female adult,which,however,had the greatest mean number of progeny,11.40 and 7.00 offsprings per female mealybug in non-choice and choice,respectively,and the sex ratio of the parasitoids on mealybug adult is the highest.Developmental durations of A.coccois progenies on different instars or stage of the mealybug were also investigated.Longest development duration of female A.coccois progeny was 14.62 d from the 1st instar nymph of the mealybug,shortest 13.97 d from female adult.Progeny parasitoids from the 1st instar nymph had the smallest size,and largest size from female adult.The results suggested that the 2nd instar nymph of mealybugs as the most suitable control target and the female adult as the most preferred stage for mass production of the parasitoid.更多还原