烟田蓼科杂草的重要天敌-褐背小萤叶甲对酸模叶蓼的控制效果研究  

The effect of G. grisescens on controlling P. lapathifolium

作　　者：林智慧 杨建全[2] 赖禄祥 张玉珍 陈家骅[2] 

机构地区：[1]福建烟草公司三明分公司,三明365000 [2]福建农林大学,福州350002 [3]福建烟草公司,福州350003

出　　处：《中国烟草学报》2006年第2期34-37,共4页Acta Tabacaria Sinica

基　　金：福建省烟草专卖局资助项目(MYKJHT200203)

摘　　要：试验结果表明,褐背小萤叶甲幼虫对酸模叶蓼幼苗期(4叶片/株)的控制效果较强,控制效果随着虫密度的增加而增强。幼虫期的控制效果(y)和1龄幼虫放虫密度(x)的线性关系式y=0.0781+0.2701x。每株投放1龄幼虫3.0头,就可取得良好防效。褐背小萤叶甲成虫对酸模叶蓼(10叶片/株)的控制效果更为显著。每株放虫4.0头、5.0头和6.0头的小区,10d后防治效果分别达到80.0%、91.3%和100%。放虫后10d的控制效果(y)与成虫放虫密度(x)的相关式y=0.2363+0.1309x,成虫对酸模叶蓼的控制效果随着放虫密度的上升而提高。成虫的投放密度达到5.0头/株,就能取得良好的控制效果。Studies showed that the larvae of G. grisescens could effectively control the 4-leaf-seedlings of P. lapathifolium and the control effect would be strengthened as the larva density increased. The linear relation between the control effect （y） and the density of one-year-old larvae （x） could be described as y = 0.0781 ＋ 0.2701x. Introduction of 5 one-year-old larvae to each seedling could result in a favorable control effect. The effect of the imagoes on controlling the 10-leaf-plants of P. lapathifolium was more obvious that in fields where had been respectively introduced 4, 5, and 6 imagoes to each plant, 80%, 91.5%, and 100% of P. lapathifolium plants were under control after 10 days. The linear relation between the control effect （y） after 10 days and the imago density （x） was y = 0.2563 ＋ 0. 1509x, indicating that the control effect would be strengthened as the imago density increased. Introduction of 5 imagoes to each plant could result in a favorable control effect.

关 键 词：褐背小萤叶甲 酸模叶蓼 控制效果 

分 类 号：S451[农业科学—植物保护]