Tang Rui, Babendreier Dirk, Zhang Feng, Kang Min, Song Kai, Hou Mao-Lin
MoA-CABI Joint Laboratory for Bio-Safety, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, 2 West Yuan-Ming-Yuan Road, Haidian District, Beijing 100193, China.
CABI Europe-Switzerland, Rue des Grillons 1, Delémont CH-2800, Switzerland.
Insects. 2017 Feb 8;8(1):19. doi: 10.3390/insects8010019.
Two species of wasps were assessed for their effectiveness against yellow stem borer . A laboratory cage test with and showed that both species parasitized yellow stem borer egg masses at 60.0% ± 9.13% and 40.7% ± 7.11%, respectively, with egg parasitism rates of 15.8% ± 22.2% for and 2.8% ± 5.0% for . Once the host eggs were parasitized, emergence rates were high for both species (95.7% ± 0.12% for and 100% for ). In paddy field trials, the two species were released at three densities (50,000/ha, 100,000/ha and 200,000/ha) in Southwestern China. Egg mass parasitism was 9% ± 7.7% for and 15% ± 14.1% for , and again only a relatively small fraction of eggs was successfully parasitized. No clear conclusion could be drawn on the most efficient release rate as no significant differences were found among the three release rates. A comparison of field-collected with and mass reared on showed significantly larger body size and ovipositor length in field-collected wasps, suggesting potentially higher effectiveness on yellow stem borer eggs after at least one generation on the target host. Factors contributing to the low field parasitism rates are discussed.
对两种黄蜂防治二化螟的效果进行了评估。一项针对[黄蜂种类1]和[黄蜂种类2]的实验室网笼试验表明，两种黄蜂对二化螟卵块的寄生率分别为60.0%±9.13%和40.7%±7.11%，其中[黄蜂种类1]的卵寄生率为15.8%±22.2%，[黄蜂种类2]的为2.8%±5.0%。一旦寄主卵被寄生，两种黄蜂的羽化率都很高（[黄蜂种类1]为95.7%±0.12%，[黄蜂种类2]为100%）。在中国西南部的稻田试验中，以三种密度（50000只/公顷、100000只/公顷和200000只/公顷）释放了这两种黄蜂。[黄蜂种类1]的卵块寄生率为9%±7.7%，[黄蜂种类2]的为15%±14.1%，同样只有相对较小比例的卵被成功寄生。由于三种释放率之间未发现显著差异，因此无法就最有效的释放率得出明确结论。将田间采集的[黄蜂种类1]与在[特定寄主]上大量饲养的[黄蜂种类1]和[黄蜂种类2]进行比较，结果表明田间采集的黄蜂体型和产卵器长度明显更大，这表明在目标寄主上经过至少一代后，对二化螟卵的防治效果可能更高。文中还讨论了导致田间寄生率较低的因素。
