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前言 在我国,利用赤眼蜂防治农林害虫是生物防治中的一种主要方法。为大量繁蜂,有必要及时地积累和长期保存中间寄主卵。目前,米蛾卵在4℃左右的冰箱中只能保存10～20天;柞蚕卵在-20℃冰箱中只能贮存一个月。而且,寄主卵羽化率和它在低温下贮存的时间成反比。因此,中间寄主卵的长期保存是赤眼蜂生产中一个急待解决的技术问题。液氮冷冻赤眼蜂寄主卵(米蛾卵等)是一项新技术,它对扩大赤眼蜂的防治面积,实
Preface In our country, the use of Trichogramma against pests in agriculture and forestry is a major method of biological control. For a large number of beekeeping, it is necessary to accumulate and long-term preservation of intermediate host eggs in time. At present, rice moth eggs can only be stored in refrigerators at about 4 ℃ for 10 to 20 days; the eggs of ova eggs can only be stored for one month in -20 ℃ refrigerators. Moreover, the rate of host egg emergence is inversely proportional to the time it is stored at low temperatures. Therefore, the long-term conservation of the intermediate host eggs is an urgent technical issue in the production of Trichogramma. Liquid nitrogen freezing Trichogramma host eggs (moth eggs, etc.) is a new technology, it is to expand Trichogramma prevention and control area, the real