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1973年5月,在上海郊区的一个桑园内,发现了患自然流行病死亡的越冬代桑毛虫幼虫,检验证明是感染了一种核型多角体病毒病。用电子显微镜观察,可以看到病毒粒子在多角体内部成束状存在。每束内的病毒粒子数目大多为6-10个。游离释放出来的病毒粒子为杆状。其大小为:60.4士4.1×347士33毫微米。根据1971年提出的病毒分类系统,这种病毒是属于杆状病毒属、亚组A中的一个种。从死虫中分离到的多角体病毒,用来对桑毛虫进行室内感染及现场小区防治试验,均有很强的致病力。桑毛虫核型多角体病毒对寄主有专一性。对家蚕没有感染致病作用。桑毛虫核型多角体病毒对桑园内桑毛虫防治提供了一个新的途径。
In May 1973, overwintering generations of mulberry larvae that died of a natural epidemic were found in a mulberry plantation on the outskirts of Shanghai and were found to be infected with a nuclear polyhedrosis virus. Observation with an electron microscope revealed that the virus particles were present in bundles inside the polyhedron. The number of virus particles in each bundle is mostly 6-10. Free release of the virus particles are rod-shaped. Its size is: 60.4 ± 4.1 × 347 ± 33 nm. According to the virus classification system proposed in 1971, this virus belongs to the genus Baculovirus, a subgroup A. Polyhedrosis virus isolated from dead insects, used for indoor infection of caterpillars and on-site cell control trials, have a strong virulence. Mulberry nuclear polyhedrosis virus is specific to the host. Silkworm infection is not pathogenic role. Mulberry nuclear polyhedrosis virus provides a new approach to the control of Mulberry mulberry.