论文部分内容阅读
为弄清榆木蠹蛾Holcocerus vicarius Walker幼虫的发育情况及预测其发生时间,通过测量榆木蠹蛾幼虫的头壳宽、体长、体宽、前胸背板宽、上颚长和上颚宽,运用Crosby生长法则和线性回归方法分析来找出判定幼虫龄数的最佳形态指标,推断其幼虫的龄数。结果表明:各龄幼虫头壳宽平均值的变异系数和Crosby指数最小,其他5项指标的变异系数和Crosby指数较大,头壳宽为最佳分龄指标。根据头壳宽将榆木蠹蛾幼虫分为20龄,不同龄幼虫头壳宽值符合Dyar定律提出的幼虫头壳宽增长规律,头壳宽和龄数的回归方程为y=0.233+1.686x+0.127x2-0.005x3(R2=0.996)。榆木蠹蛾幼虫龄数的确定为研究其发生规律、生物学习性及进行综合防治提供依据。
In order to understand the development of Holcocerus vicarius Walker larvae and predict their occurrence, we measured the head shell width, body length, body width, The Crosby growth rule and linear regression analysis were used to find out the best morphological indexes for judging the larval age and deducing the larvae ’s age. The results showed that the coefficient of variation and the Crosby index of the wide-shell average of the head larvae of each instar larvae were the smallest, while the other 5 indexes had the largest coefficient of variation and Crosby index and the wide head-shell lamellae. According to the width of the head shell, the age of H. armigera larvae was divided into 20 age groups. The width of head shell of different age larvae was in accordance with the rule of Dyar’s law. The regression equation of head shell width and age was y = 0.233 + 1.686x + 0.127x2-0.005x3 (R2 = 0.996). The determination of larvae age of Cydia pomonella provides the basis for studying its genesis, biological behavior and comprehensive control.