论文部分内容阅读
小地老虎是棉花苗期的主要害虫之一,抓住防治适期给于消灭是保全苗的一个重要措施。如何预测防治适期,以前报导主要是靠检查叶面被害情况进行防治。现根据一九七二年至一九八○年九年资料分析,有效发蛾高峰日到防治适期为一个经验值,而有效发蛾高峰日又可根据其与当年早春二至四月的相关性来确定。一、预测方法1、有效发蛾高峰日的测定:据九年资料统计分析,有效发蛾高峰日与三月下旬气温呈负相关,相关系数为-0.8239;可靠性0.05>P>0.01,相关显著。其直线相关预测式为y=62.9985-3.465x(y 为有效发蛾高峰日,以三月十日为起点,x 为三月份
Small tiger is one of the main pests in cotton seedling stage, to seize the appropriate period for the prevention and control of extinction is to protect seedlings an important measure. How to predict the appropriate period of prevention and control, previously reported mainly by checking the case of leaf damage control. Based on the data analysis from 1992 to 1980, it is an empirical value for effective moth to reach the appropriate stage of control and effective peak moth can also be calculated according to the data of the peak from February to April of the same year Relevance to determine. First, the forecast method 1, effective hair moth peak day determination: According to nine years of statistical analysis, effective hair moth peak day and late March temperature was negatively correlated, the correlation coefficient was -0.8239; reliability 0.05> P> 0.01, the correlation Significant. The linear predictive formula for the y = 62.9985-3.465x (y is effective hair moth peak day, March 10 as a starting point, x for March