广西蔗区蔗茎红粉蚧发生危害调查

Investigation on occurrence and damage of pink sugarcane mealybug Saccharicoccus sacchari (Cockerell) (Hemiptera:Pseudococcidae) in Guangxi sugarcane-growing area

【目的】分析蔗茎红粉蚧在广西蔗区的发生危害情况，为生产上预防和控制该粉蚧提供科学依据。【方法】2012年7月-2013年1月，在广西9个主要蔗区16个点随机调查20块蔗田甘蔗上蔗茎红粉蚧的虫口密度及为害株率。虫口密度调查为在蔗田设8个取样点，每点相隔3行，每取样点随机选取相近3株甘蔗，调查记录蔗茎红粉蚧的发生数量；为害株率调查为顺序调查同行100株甘蔗中发生蔗茎红粉蚧的株数，重复4次。【结果】蔗茎红粉蚧在广西9个主要蔗区均有发生，以崇左市蔗区发生较为严重，为害株率超过60．00％；北海市合浦县南康镇的蔗茎红粉蚧为害株率虽高达79．75％，但其虫口密度相对较低；南宁市横县陶圩镇、柳州市柳城县大埔镇、河池市罗城县、贵港市港南区及百色市田阳县等蔗区蔗茎红粉蚧为害也较为严重，为害株率为40．00％～70．00％。【结论】蔗茎红粉蚧在广西蔗区普遍发生，是广西蔗区重要害虫之一。

[Objective ]The occurrence and damage of pink sugarcane mealybug Saccharicoccus sacchari （Cockerell） （Hemiptera： Pseudococcidae） in Guangxi sugarcane-growing regions were analyzed to provide scientific references for preventing and controlling this pest. [Method]The damaged plant rate and population density of S. sacchad on 20 sugarcane plots in 16 spots of 9 main cane regions were investigated from July 2012 to January 2013. To test population density, three canes in field were selected randomly from each of the 8 permanent sampling positions, which were 3 rows apart, and the mealybugs on canes were recorded. The damaged plant rate was investigated by recording the number of damaged plants from 100 canes in the same cane row for 4 times. [Result]The results showed that S. sacchad was found in the 9 main sugarcane-growing regions In particular, Chongzuo was hit most seriously with the damaged plant rate over 60.00%. Though the damaged plant rate was as high as 79.75% in Kangnan Town in Hepu County of Beihai City, the population density was relatively low there. Other severe areas were Taoxu Town in Heng County of Nanning City, Dapu Town in Liucheng County of Liuzhou City, Luoeheng County of Heehi City, Gangnan District of Guigang City and Tianyang County of Baise City with the damaged plant rate range of 40.00%-70.00%. [Conclusion]S. sacchad was one of the most important pests on sugarcane, which could be found in main sugarcane-growing regions in Guangxi Province.