七星瓢虫规模化饲养的质量控制

Quality Control in Mass Rearing Procedure of Coccinella septempunctata L.(Col. Coccinellidae)

从七星瓢虫生活力、生殖力、捕食能力角度 ,提出了其规模化饲养的质量控制标准 (可测量 )及其测试办法。 (1 )生活力特征 :体重大于 2 6 .9mg,羽化率大于 87.7% ,寿命达到 6 2 .9天 ,贮藏时间大于 5 1 .6天 ;(2 )生殖力特征 :成虫产卵前期短于 1 3.7天 ,产卵雌虫率大于 86 .9% ,产卵期大于 5 2 .9天 ,所产卵孵化率达到 85 .8% ,产卵量达到 40 2 7粒 ;(3)捕食能力 :饥饿 2 4小时后 ,在 2 2 0头蚜虫 / m2 密度下 ,日捕食量达到 70 .1 5头。符合此标准的七星瓢虫在捕食功能上与蚜虫饲养的试验种群相同。将此七星瓢虫以瓢蚜比 1∶ 1 0 0释放至田间时 ,成虫 5天后达到 82 .5 %的防治效果 ,释放蛹则有 2～ 3天滞后期。故在田间应用时 ,应提前 2天置室温下羽化后释放。

Quality control plays a key role in commercial production of beneficial insects. The measurable quality criteria of Coccinella septempunctata L.in mass rearing procedure are proposed in this article. (1) Life characters: bodys weight should be no less than 26.9 mg, emergence should exceed 87.7%, and adult longevity should reach 62.9 d. Furthermore, it can be stored no less than 51.63 d. (2)Fecundity characters: preovipositional period should be shorter than 13.7 d, more than 86.9% adult female should lay eggs normally. At the same time, its oviposition period should be longer than 52.9 d, and each female adult can lay more than 4027 eggs in its life. (3)Predator potentials: after starved for 24 h, the adult beetle should consume more than 70 aphids per day when 220 aphids per m 2 are supplied.