摘要
为探讨甜菜夜蛾(Spodoptera exigua)幼虫对不同寄主植物的危害性,选取灰菜、苋菜、甜菜和葱4种植物进行了选择性实验,并同时研究了幼虫对4种植物的营养利用。结果表明:甜菜夜蛾1龄幼虫的趋性表现为灰菜、苋菜、甜菜、葱;3龄幼虫对寄主植物的选择性低于1龄幼虫,且随观测时间的延长,选择性明显减弱。取食甜菜组的幼虫相对生长率和食物转化率显著高于其余组;取食葱组的幼虫相对取食量和近似消化率显著高于其余组;取食灰菜组的食物利用率最高。甜菜夜蛾3龄幼虫可严重为害甜菜和葱。因此,在农业操作过程中,应加强对甜菜夜蛾3龄幼虫的监控和治理。
In order to explore the larval damage of Spodoptera exigua on different host plants,Chenopodium album L.,Amaranthus mangostanu,Beta vulgaris and Allium fistulosum L.were assessed by selection tests feeding preferences and the nutritional utilization of S.exigua.The results indicated that the preference of 1 st instar larva to the four plants was C.album L.,A.mangostanu,B.vulgaris and A.fistulosum L..Feeding preference of the 3 rd instar larva was not as obvious as the 1 st instar larva.And the host plant feeding preference of 3rd instar larva was weakened with the prolonged observation period.The nutrition indexes of 3rd instar larvae on consumption of the four host plants indicated that the relative growth rate（RGR） and efficiency of conversion of digested food（ECD） in larva feeding on B.vulgaris was significantly higher than that on the three plants;the relative consumption rate（RCR） and approximate digestibility（AD） in larva feeding on A.fistulosum L and the efficiency of conversion of ingested food（ECI） in larva feeding on C.album L.was the highest.3rd instar larva could seriously harm the B.vulgaris and A.fistulosum L..Therefore,in the process of operation in agriculture,the 3rd instar larvae should be strengthened monitoring and management.
出处
《中国农学通报》
CSCD
北大核心
2011年第30期233-236,共4页
Chinese Agricultural Science Bulletin
基金
黑龙江省教育厅科学技术研究面上项目"甜菜夜蛾寄主定向行为的化学机制研究"(11531293)
关键词
甜菜夜蛾
趋性
营养指标
Spodoptera exigua
host preference
nutritional indices
