摘要
瓢虫柄腹姬小蜂在南昌室内,5月下旬至12月上旬可繁殖11代,每代需12～46天。该蜂的发育起点温度为5.28℃。有效积温296.85日度。在28℃下,饲以10％蜂蜜,成蜂平均寿命为5.52天,不喂蜂蜜平均约缩短3天。该蜂能寄生28星瓢虫幼虫的各个龄期,但更喜寄生高龄幼虫,以4龄幼虫作寄主,每雌一生能寄生幼虫6.21头,子蜂数平均为74.57头。可行孤雌生殖产雄。在马铃薯上的自然寄生率以6月份最高,平均为28.47％。在龙葵上以7月份最高平均达64.5％。7月中旬由于高温的影响,寄主和寄生蜂的发育受到抑制,寄生率急剧下降。
In the laboratory rearings at the natural temperature of Nanchang, P. foveolatus could complete 11 generations during late May to early December in a year. Each generation needed 12 to 46 days. The threshold and accumulative effective temperatures for development were determined as 5.28°C and 296.85 degree-days, respectively. Under a laboratory condition of 28°C the average adult longevity of the parasitoid was 5.52 days when fed with 10% honey solution. Removing the honey solution reduced adult longevity for about 3 days. The parasitoid could parasitize all larval stages of Henosepilachna viginiioctopunctata [Col: Coccinellidae], but preferred later instars. When provided with 4th instar larvae in the laboratory, the female wasps parasitized an average of 6.21 larvae in its life span, and produced 74.57 offsprings. The females couid perform thelytoky parthenogenesis. In fields, the peak of natural parasitization of H. vigintioctopunctata by P. foveolatus on potato occurred in June as 28.47%, but in July as 64.5% on black nightshade, Solanum nigrum. The high temperature during July caused high mortalities of both the pest and the parasitoid, resulted in a dramatic decline of the parasitization rate.
关键词
柄腹姬小蜂
28星瓢虫
生物学特性
Pediobius foveolatus Henosepilachna vigintioctopunctata potato pest
