Abstract: The relationship between the number and the total length of feeding scars of the first generation adults of the rice water weevil(RWW),Lissorhoptrus oryzophilus Kuschel(Coleoptera: Curculionidae) was analyzed in field experiments during 2004 and 2005.The feeding scars on the barnyardgrass(Echinochloa crus-galli L.) leaves overnumbered those on leaves of rice,Cyperus difformis and Leersia herxandra.All 16 couples of relationships between the number and the total length of feeding scars for combinations of 2 host plant species and 2 transplanting dates,4 different species with 2 measurements respectively,were significantly positive linear.The plant species had significant effect on the regression coefficients,with the highest one on barnyardgrass.Such linear regression was robust for rice and barnyardgrass with different transplanting dates,but was not stable for different measure dates in most cases.The regression approach could be used for preliminary quantitatively inference of total feeding(and then density) of RWW at the early stage of invasion in a newly RWW invaded habitat,for evaluation of RWW resistant rice germplasm,and for test of host plant specificity in selection of biocontrol candidate agents of alien invaded weeds.

Key words: Lissorhoptrus oryzophilus, feeding scars, barnyardgrass, regression analysis, forcast

摘要： 在2004年和2005年两年的田间实验中，研究分析了每丛植物上稻水象甲一代成虫的取食斑数量与长度间的线性回归关系。每丛稗草上的稻水象甲取食斑总量显著高于水稻、异型莎草和李氏禾上的；两种寄主植物的两种移栽期的组合、4种不同寄主植物各2次观察得到的共16组每丛植物上的稻水象甲取食斑数量和总长度间的直线回归方程均显著；植物种类对回归系数有显著影响，以稗草上的最大。这些回归方程对稗草和水稻的不同移栽期总体而言是稳健的，但对不同观察期则不稳健。本试验建立的取食斑数量与总长度的直线回归法可用于稻水象甲控制阈值的确定、稻水象甲入侵早期的取食量及成虫密度初步推断、抗稻水象甲的水稻种质资源评估以及应用一些象甲控制外来入侵植物时的寄主专一性测定。

关键词: 稻水象甲, 取食斑, 稗草, 回归分析, 预测预报