论文部分内容阅读
柑桔木虱(Daiphorina citri kuway-ama)是柑桔黄龙病的传病媒介,它的发生与柑桔黄龙病的流行密切相关.1982年以来,作者在参加全区柑桔黄龙病和柑桔木虱普查后,又多次对灵川、兴安和灌阳三县进行调查,同时在兴安和灌阳县设立监测哨,定期对柑桔木虱的动态进行调查监测.1987年8～10月间,又对1982年普查时未发现柑桔木虱的兴安等7个县进行了调查.结果所调查的7个县全都有了柑桔木虱发生,柑桔木虱在广西的分布北缘已到了最北县份.作者以调查的结果绘成《广西柑桔木虱北延情况示意图》,此图可见,1980年以来,广西柑桔木虱有两次大规模和一次小规模北移;第一次大规模北移该虫的分布北缘线由1980年的北纬25度向北推移了0.5度,分布范围扩大了7个县(市);第二次是小规模北移,分布北缘线仅向北延伸了15公里.第三次大规模北移,分布北缘线由北纬25.5度又向北推移了0.5度,分布范围扩大了7个县.经过上述三次北移,该虫在广西的分布范围扩大了14个县(市),致使广西全境都有了柑桔木虱发生.作者对柑桔木虱逐年向北迁移的原因作初步分析:1、柑桔木虱大规模向北扩散的最可能途径是:随气流迁移.如上所述,在短短的几年里,此虫就作了三次北移,范围波及14个县(市).如不是借风力作迁移,是不可能达到的.2、大量的虫源是柑桔木虱北延的
Daiphorina citri kuway-ama is a pathogenic vector of citrus yellow dragon’s disease and its occurrence is closely related to the prevalence of citrus yellow dragon’s disease.From 1982, the author participated in the citrus Huanglongbing and citrus After the census of the wood louse, they repeatedly investigated the Lingchuan, Xing’an and Guanyang counties, set up monitoring posts in Xing’an and Guanyang counties, and conducted regular surveys on the dynamics of citrus psylla. And investigated the seven counties such as Xing’an where no citrus psyllid was found at the 1982 census.Results All the seven counties surveyed had the occurrence of citrus psyllid and the distribution of citrus psyllid in Guangxi Has been to the northern counties.The author of the survey results drawn “Guangxi citrus psyllids northward extension of the situation map”, this map shows that since 1980, Guangxi Citrus psyllid has two large-scale and a small move north; The first large-scale northward migration of the worm North margin line from 1980 north latitude 25 degrees northward by 0.5 degrees, the distribution expanded by seven counties (cities); the second is a small-scale northward shift north The margin line extends only 15 km to the north. For the third large-scale northward move, the north margin of the distribution shifted from north to latitude 25.5 degrees northward by 0.5 , The distribution expanded by 7 counties.After the above three northward migration, the distribution of the insect in Guangxi expanded by 14 counties (cities), resulting in the occurrence of citrus psylla throughout Guangxi.The author of the citrus psyllid The reasons for migration to the north each year for a preliminary analysis: 1, citrus psyllid spread to the north most likely way is: migration with the air As mentioned above, in just a few years, the worm made three times North Shifting, the scope spread to 14 counties (cities) .If not by wind for migration, is impossible to achieve.2, a large number of insects citrus psyllids north extension