The aphid endoparasitoid Diaeretiella rapae (McIntosh), parasitizing green peach aphid Myzus persicae (Sulzer), mustard aphid Lipaphis erysimi (Kaltenbach) and cabbage aphid Brevicoryne brassicae (L.) in Kangra, Kullu, Mandi, Shimla, Hamirpur, Sirmaur, Una and Bilaspur districts of north Indian Himalayan state, Himachal Pradesh was studied. At different locations, parasitism by D. rapae in December, January, February and March ranged from 0.00 to 5.30, 0.00 to 16.40, 19.30 to 31.20 and 0.00 to 49.80%. Under field conditions, experiments were conducted to evaluate the side effect of some commonly used chemical insecticides and biopesticides on D. rapae. Percent parasitism by D. rapae in dimethoate treated plots was negatively affected, and it reduced from 11.85 to 0.01%, whereas biopesticides didn't affect the parasitism. Further laboratory investigations assessed the suitability of aphids viz. M. persicae, B. brassicae and L. erysimi as hosts for mass rearing of D. rapae. Among the aphid hosts, second nymphal instar of M. persicae was found to be the larger in size, followed by B. brassicae and L. erysimi. D. rapae reared on M. persicae were larger in size compared to those reared on B. brassicae and L. erysimi. Further, M. persicae reared on Capsicum annuum proved to be the best aphid host for D. rapae based on high percent parasitism (58.60%) and high fertility (76 eggs/female). The current research advises that D. rapae can be mass reared on aphid hosts in a laboratory that would supplement augmentative biological control in rapeseed-mustard. Our results also demonstrate that biopesticides can be used against aphids infesting rapeseed-mustard, with limited risk to the parasitoid, D. rapae and can be a fruitful option to chemical-based insecticides.

蚜虫内寄生Diaeretiella rapae (McIntosh)，寄生在Kangra、Kullu、Hamdiir、Shimla、西姆拉和西姆拉的绿桃蚜虫Myzus persicae (Sulzer)、芥菜蚜虫Lipaphis erysimi (Kaltenbach)和甘蓝蚜虫Brevicoryne brasicae (L.)研究了北印度喜马拉雅州喜马偕尔邦的 Bilaspur 地区。在不同地点，油菜花在 12 月、1 月、2 月和 3 月的寄生率范围为 0.00 至 5.30、0.00 至 16.40、19.30 至 31.20 和 0.00 至 49.80%。在田间条件下，通过实验评估了一些常用的化学杀虫剂和生物农药对油菜的副作用。寄生百分比D.菜粉蝶在乐果处理小区则是负面影响，这从11.85下降到0.01％，而生物农药并没有影响到寄生。进一步的实验室调查评估了蚜虫的适用性，即。M. persicae, B . 芸苔属和L . 蚜作为大规模饲养主机D.菜青虫。在蚜虫寄主中，发现M. persicae 的二龄若虫体积较大，其次是B。芸苔属和L . Ë rysimi。D. rapae在M 上饲养。桃科与在B 上饲养的那些相比，它们的体型更大。芸苔属和L . 蚜。此外，桃蚜饲养辣椒被证明是最好的蚜虫主机D.菜粉蝶基于高百分比寄生（58.60％）和高育（76个卵/女）。目前的研究表明，油菜花可以在实验室中对蚜虫宿主进行大规模饲养，以补充油菜芥菜中的增强生物控制。我们的结果还表明，生物农药可用于防治感染油菜芥的蚜虫，对寄生蜂D. rapae 的风险有限 并且可以成为化学杀虫剂的有效选择。