Trapping of Cinara pinea with Shellac

Based on the observation and record of trapping effect of Cinara pinea in urban green space for three consecutive years,the occurrence regularity and causes of C.pinea in urban green space were summarized.The results showed that the quantity of C.pinea was different in different months from August to December,and the damage degree of C.pinea was reduced in the next spring.During rainy and snowy weather from August to December,the number of C.pinea was relatively large,and the egg quantity of C.pinea in February and the number of C.pinea in April were relatively low.Some suggestions on the prevention and control of C.pinea in urban parks were put forward.

异色瓢虫对松大蚜和板栗大蚜选择效应研究

异色瓢虫是徂徕山林场常见天敌之一,在实验室条件下,测定了异色瓢虫对徂徕山林场2种重要蚜虫板栗大蚜和松蚜的选择效应。结果表明,当2种蚜虫种群数量同步增加,则取决于瓢虫原来的生境和饲喂条件,当板栗大蚜或松蚜种群上升时,则喜好取食种群数量大的蚜虫。

松树大量死亡与虫害调查分析

对死亡松树研究的表明,松褐天牛等蛀虫是在松树在死亡过程中侵入的,而且许多死亡松树还未遭松褐天牛等蛀虫侵入,所以松褐天牛不是松树大量死亡的原因。在松树大量死亡的重灾林中,松针牡蛎蚧、松粉蚧、草履蚧、棒毛小爪螨、针叶小爪螨、松球蚜和松蚜等是松树的主要害虫,它们单独或其中两虫或多虫交替、同时或反复大发生侵害枝叶和新梢,严重影响营养与水分的产生、运输,导致根系与枝叶首先死亡,然后整株松树死亡。作者提出了防治松树大量死亡的对策与技术。

包头市区油松针叶"红化"及虫害成因探讨

近年发现,包头市区油松普遍长势衰弱,针叶变红。为了分析油松针叶"红化"现象与病虫害之间的关系,对包头市区油松进行了实地调查与取样检测。结果表明:包头市区油松病虫害非常严重,主要病害为针叶"红化",发病率高达90.03%,感病指数为62.06%;主要虫害为松大蚜危害,发病率高达90.03%,感病指数为44.61%;油松长势越衰弱,针叶"红化"现象的发病率、感病指数越高;同时松大蚜虫害的发病率、感病指数越低,这主要是油松针叶"红化"后,可食性成份减少导致松大蚜转移所致。

引起害虫大规模流行病的两种虫霉

我国南方重要害虫松大蚜及茶尺蠖中近年来分别发现由加拿大虫疫霉和圆孢虫疫霉造成的大面积流行病,在短期内将害虫种群摧毁殆尽。加拿大虫疫霉系我国首次记载。本文描述和讨论了2种虫生真菌的形态特征,记载了真菌病的流行概况。