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利用病毒可有效地防治害虫,这在加拿大已被证实.但由于使用均为未提纯的病毒,其防治范围也比较小.为探索高度纯化核多角体病毒的毒杀力,笔者于1977年在苏格兰进行防治松叶蜂试验,用能喷洒直径50微米微粒的喷雾器,多角体每公顷使用3×10~7、3×10~9和3×10~(11)三种处理(每公顷加水约6升,并加0.25%界面活性增湿剂),喷洒时间为松叶蜂卵孵化90%时进行.结果认为,以每公顷用3×10~9多角体即达良好效果.1978年,采用多角体油剂试验,地面用手持旋转喷雾器喷洒,空中用直升飞机喷雾.结果表明:地面每公顷用1×10~(10)多角体效果良好;空中也取得了类似的结果.但昆虫种群密度过高,仍落叶较多,由此可见,仅用病毒一种方法能否达到完全防治目的,尚待进一步研究.
The use of the virus can effectively control pests, which has been confirmed in Canada, but due to the use of all unpurified virus, its control range is relatively small to explore the highly purified nuclear polyhedrosis virus poisoning, the author in 1977 in The pine needles test was conducted in Scotland using sprayers capable of spraying particles with a diameter of 50 μm and polyhedrons of 3 × 10 ~ 7, 3 × 10 ~ 9 and 3 × 10 ~ (11) per hectare 6 liters, plus 0.25% interfacial moisturizing agent) spraying time was 90% of pine needles egg hatching results that the use of per hectare with 3 × 10 ~ 9 polyhedron that is good effect in 1978, the use of Polyhedron oil test, the ground was sprayed with a hand-held rotary atomizer and the helicopter was sprayed in the air.The results showed that 1 × 10 ~ (10) polyhedron per hectare was effective on the ground and similar results were obtained in the air, but the insect population Density is too high, still leaves more, we can see that only a virus with a method can achieve the purpose of complete prevention and control yet to be further studied.