叉角厉蝽对烟草上斜纹夜蛾搜索效率影响因子的研究

A study on influence factors of search efficiency of Eocanthecona furcellata(Hemiptera)on Spodoptera litura(Lepidoptera:Noctuidae)in tobacco

叉角厉蝽Eocanthecona furcellata(Wolff)是捕食烟草上斜纹夜蛾Spodoptera litura(Fabricius)的重要天敌,是斜纹夜蛾生物防治的潜在控制因子。为了探明不同因子对叉角厉蝽搜索效率的影响,提高田间释放的控害效果,本试验采用二次通用旋转组合设计,研究了不同因子(叉角厉蝽释放量、斜纹夜蛾幼虫密度和烟草植株数量)对叉角厉蝽搜索效率的影响,根据测得的不同因子处理下叉角厉蝽对斜纹夜蛾的捕食率,所建立得到的搜索效率(Y)与叉角厉蝽释放量(X 1)、斜纹夜蛾幼虫密度(X 2)和烟草植株数量(X 3)3个试验因子的关系的回归模型:Y=67.82809+6.74050 X 1-4.92690 X 2-1.22581 X 3-9.22848 X 12-1.32656 X 22-9.98862 X 32+4.17500 X 1 X 2+8.17500 X 1 X 3+0.87500 X 2 X 3,能较好地拟合参试因子与叉角厉蝽搜索效率的关系。单因子效应分析表明,对叉角厉蝽搜索效率的影响依次为叉角厉蝽释放数量(X 1)>斜纹夜蛾幼虫密度(X 2)>烟草植株数量(X 3),叉角厉蝽释放数量对天敌的搜索效率有显著的正效应。在交互效应分析中,随着烟草植株数量的上升,叉角厉蝽的搜索范围扩大,抑制了叉角厉蝽数量和斜纹夜蛾密度的增益效果,对捕食效率产生负效应。叉角厉蝽释放数量、斜纹夜蛾幼虫密度和烟草植株数量均能影响叉角厉蝽的搜索效率,且各因子之间的交互作用明显。

The predatory stink bug, Eocanthecona furcellata(Wolff)is an important polyphagous insect predator which as a kind of important biological agents to control on Spodoptera litura(Fabricius)in tobacco fields. In order to find out the influence of different factors on the search efficiency of E. furcellata and improve the control efficiency in the field, based on the quadratic general rotary unitized design, the effects of different factors(such as release density, larval density and number of tobacco plants)on the search efficiency of E. furcellata were studied in this paper. The results showed that the quadratic orthogonal regression model of the predation efficiency(Y)for release density of E. furcellata(X1), larval density of S. litura(X2), and number of tobacco plant(X3)was Y=67.82809+6.74050X1-4.92690X2-1.22581X3-9.22848X12-1.32656X22-9.98862X32+4.17500X1X2+8.17500X1X3+0.87500X2X3,with good fitting degree. The single factor effect analysis showed that the influencing extent of factors on the search efficiency of E. furcellata was release density of E. furcellata(X1), larval density of S. litura(X2), and number of tobacco plant(X3). The release density of E. furcellata had a significant positive effect on the search efficiency of predator. The result of analysis on interactive effect indicated that the search ranges of E. furcellata was expanded with the increase of the number of tobacco plants, which inhibited the gain effect of E. furcellata and S. litura density, and made negative effects on the predation efficiency. The different factors such as release density of E. furcellata, larval density of S. litura, and number of tobacco plant had effect on the search efficiency of predator which the interaction among there factors was obvious.