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在解决生物防治问题时,经常不得不遇到外因的影响,即病原体和寄主相互关系的减弱和增强。例如,在自然条件下太阳辐射能给予昆虫病原有机体以强烈的影响。在资料中,有有关太阳光线对病毒钝化的报导。因为太阳光能够阻碍病毒制剂在野外条件下的有效利用。 1970—1972年研究了日照对苹小蠹蛾颗粒病毒侵染性的影响。试验是在室内和野外条件下进行的。病原菌的水悬浮液是通过分离因病而死亡的幼虫体制成的。病毒悬浮液通过卡玻隆
In solving biological control problems, we often have to experience the influence of external factors, that is, weakened and enhanced mutual relations between pathogens and hosts. For example, solar radiation under natural conditions gives a strong influence on entomopathogenic organisms. In the information, there are reports about sun light on the virus passivation. Because sunlight can hinder the efficient use of the virus agent under field conditions. From 1970 to 1972, the effect of sunshine on the infectivity of WPKV was studied. The test is carried out indoors and outdoors. Aqueous suspensions of pathogens are made by isolating larvae that died of illness. The virus suspension passes through the cardon