The present investigation was carried out on in vitro mass multiplication, larval feeding capacity, and pollination efficiency of two aphidophagous syrphids viz., Eupeodes frequens (Matsmura) and Episyrphus balteatus (De Geer) (Diptera: Syrphidae) on cabbage aphid (Brevicoryne brassicae L.) (Homoptera: Aphididae) on mustard crop under mid hill conditions. The results revealed that the incubation, larval, and pupal periods were 3.5, 12.4, and 11.9 days, respectively for E. frequens and 3.8, 13.7, and 8.8 days, for E. balteatus. Longevity of male and female was 15.2 and 17.6 days for E. frequens and 10.6 and 12.6 days for E. balteatus, respectively. When the adults were fed on different diets, adult longevity and fecundity recorded significantly maximum on 10% honey solution + fresh pollen grains. E. frequens consumed an average of 261.7 individuals of cabbage aphids per larva during total larval period, whereas the larva of E. balteatus consumed 393.6 cabbage aphids. The pollination efficiency of hoverflies on Indian mustard (Brassica juncea L.) was studied under caged conditions. It was observed that the plants pollinated by E. balteatus and E. frequens showed 55.12 and 52.97% seed set. Among the different diets, fresh pollen grains + 10% honey solutions recorded to be the best diet for mass rearing of syrphids.

中文翻译：

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幼虫进食容量和食蚜类食蚜蝇授粉效率，Eupeodes frequens（Matsmura）和黑带食蚜蝇（蝇）（双翅目：食蚜蝇科）在甘蓝蚜（甘蓝蚜L.）：上芥菜作物（同翅目蚜科）

本研究对甘蓝蚜（Brevicoryne Brassicae L）上的两个食蚜食蚜虫（Eupeodes frequens（Matsmura）和Episyrphus balteatus（De Geer）（Diptera：Syrphidae））的体外大量繁殖，幼体摄食能力和授粉效率进行了研究。）（Homooptera：Aphididae）在中等丘陵条件下的芥菜作物上。结果表明，弗氏大肠杆菌的孵化期，幼虫期和幼虫期分别为3.5、12.4和11.9天，而巴尔提氏大肠杆菌则分别为3.8、13.7和8.8天。频率分别为：E。frequens的男性和女性的寿命分别为15.2和17.6天，Balteatus的男性和女性的寿命分别为10.6和12.6天。当成年人以不同的饮食喂养时，在10％的蜂蜜溶液+新鲜的花粉粒中，成年人的寿命和繁殖力显着最高。大肠杆菌的平均消费为261。在整个幼虫期中，每个幼虫有7个人的白菜蚜虫，而巴尔氏肠杆菌的幼虫消耗了393.6个白菜蚜虫。在笼养条件下研究了蚜蝇对印度芥菜（Brassica juncea L.）的授粉效率。观察到由巴氏大肠杆菌和弗氏大肠杆菌授粉的植物显示出55.12和52.97％的结实率。在不同的饮食中，新鲜的花粉粒+ 10％的蜂蜜溶液被记录为大规模养鱼的最佳饮食。