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菜蛾啮小蜂Oomyzussokolowskii (Kurdjumov)是小菜蛾PlutellaxylostellaL .的一种主要寄生天敌。观察表明 ,该蜂喜产卵于小菜蛾各龄幼虫 ,也可产卵于预蛹 ,进行幼虫至蛹期的跨期聚寄生。每头寄主蛹出蜂多为 5～ 10头 ,平均 7 8头 ,其中雌蜂占 85 %～ 90 %。该蜂也可产卵于在小菜蛾幼虫体内寄生的菜蛾绒茧蜂高龄幼虫 ,故又是小菜蛾的兼性重寄生蜂。在杭州 ,每年该蜂在田间的活动期为 4～ 10月 ,10月中下旬陆续以老熟幼虫或预蛹进入休眠越冬 ,第二年 4月陆续羽化并开始产卵寄生。该蜂发育、存活和繁殖的适温范围为 2 0～ 30℃ ,低于 2 0℃或高于 30℃对其存活不利 ,但在适温下发育羽化的雌蜂 ,短时间内在 32～ 35℃高温下仍可大量产卵寄生。在2 0℃、 2 5℃和 30℃下 ,平均每雌一生可寄生小菜蛾幼虫数分别为 3 1、 13 2和 6 8头 ,产子蜂数分别为 2 0 5、 92 1和 5 0 4头 ,内禀增长率分别为 0 0 82、 0 2 40和 0 2 6 3(雌 /雌·天 )
Oomyzussokolowskii (Kurdjumov) is a major parasitic natural enemy of the Plutella xylostella L. diamondback moth. The observation shows that the bee likes to lay eggs in each instar larvae of Plutella xylostella and can also lay eggs in the pre-pupa for interphase polyparasites from larval to pupal stage. Each host pupae out of more than 5 to 10 heads, an average of 78 heads, of which female bees accounted for 85% to 90%. The bee can also spawn in the diamondback moth larvae parasitized the parasitoid larvae of the moth, so it is diamondback moth parasitoid. In Hangzhou, the annual activity of the bee in the field is from April to October. In late-mid-October, mature bee larvae or pre-pupae enter the dormancy dormancy. In April of the following year, they gradually emerge and begin spawning parasitism. The suitable range of temperature for the development, survival and reproduction of the bees is 20 ~ 30 ℃, which is unfavorable to the survival when the temperature is below 20 ℃ or above 30 ℃. However, High temperature can still be a large number of spawning parasites. The average larvae of parasitized Plutella xylostella larvae per plant per day at 21 ℃, 25 ℃ and 30 ℃ were 31, 132 and 68, respectively, and the number of bee-pollinators was 205, 92 1 and 540 respectively Head, intrinsic rate of increase were 0 0 82, 0 2 40 and 0 2 6 3 (female / female days)