甘薯小象甲田间发生规律试验研究

Experimental study on the occurrence of sweet potato weevil in the field

近年来,甘薯小象甲在衢州市发生趋重,以衢江区十里丰始发地为中心的疫区已蔓延至整个衢州市乃至周边地区,严重威胁衢州市乃至浙江省甘薯产业的发展。本研究通过性诱剂诱捕监测甘薯小象甲田间虫口密度消长动态,分析了甘薯小象甲田间消长特点及其原因,同时比较了不同甘薯品种的小象甲为害差异。结果表明:2019年甘薯小象甲在衢江区的田间发生高峰在10—11月,最高峰在10月底。气温是影响小象甲生长活动的一个重要因素,甘薯小象甲的消长动态与平均气温呈现显著的负相关。甘薯品种的早熟性与结薯深浅的不同会显著影响小象甲消长动态,会直接造成小象甲的危害程度的不同,本研究中早熟性最好、结薯最浅的品种衢薯2号拥有最大的小象甲诱捕量(1 229头)和最严重的薯块受害率(85.71%)。

In recent years,the sweet potato weevil has become more and more severe in Quzhou city,and the epidemic area centered around the origin of Shilifeng in Qujiang District and has spread to the entire Quzhou City and even the surrounding areas,seriously threatening the development of the sweet potato industry in Quzhou City and even Zhejiang Province.In this study,the population density and growth dynamics of sweet potato weevils in the field were monitored by sexual attractant trapping,and the characteristics and causes of sweet potato weevils in the field were analyzed,and the differences in the damage of weevils of different sweet potato varieties were compared.The results showed that in 2019,the peak occurrence of sweet potato weevils in Qujiang District was from October to November,and the peak was at the end of October.Temperature is an important factor affecting the growth of weevils,and the dynamics of sweet potato weevils are negatively correlated with the average temperature.Qushu 2,the cultivar with the best precociousness and the shallowest potato setting in this study,had the largest weevil trapping rate(1229)and the most serious tuber damage rate(85.71%).