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通过几年来的实践,我们对玉米螟卵赤眼蜂的繁殖和应用,初步明确了以下几个问题。 一、蜂种问题 本地蜂种有适应性强、生活力旺盛、寄生率高等优点,因此采集本地玉米螟卵的赤眼蜂作蜂种比较好。一般在8月下旬晚玉米收获前15-20天采集3—4次,将卵块周围叶片剪去,装入大指形管,待羽化后作蜂种。 开始接种繁殖时寄生率往往很低,一般不寄生柞蚕卵;冷藏二、三个月的蓖麻蚕卵,寄生率仅有5％左右,新鲜卵可达20％左右;柳天蛾新鲜卵寄生率可高达40％左右。需连续繁殖二、三代后寄生率才能明显提高,如蓖麻蚕卵为61.7—85.9％,柳天蛾卵为80.6—91.0％。因此,用田间赤眼蜂作蜂种和选择适宜寄主卵很重要。
Through years of practice, we have initially identified the following problems on the breeding and application of Trichogramma ostriniae. First, the bee species of native bee have strong adaptability, strong viability, high parasitism advantages, so collecting the local corn borer eggs Trichogramma bee is better. Usually in late August late 15-20 days before harvest corn harvested 3-4 times, the leaves around the cut off, into the big finger pipe, to be after the emergence of bee. The parasitism rate is usually very low when the inoculation is started, generally do not parasitize the tussah eggs; the refrigerated two or three months of castor silkworm eggs, the parasitism rate is only about 5%, the fresh eggs can reach about 20%; The rate can be as high as 40%. The need for continuous breeding two or three generations after the parasitic rate can be significantly improved, such as castor silkworm eggs 61.7-85.9%, willow moth eggs 80.6-91.0%. Therefore, the use of Trichogramma bee species and choose suitable host eggs is very important.