摘要
利用4a对杨毒蛾发生期的系统观测资料,运用数理统计方法,计算出杨毒蛾同一虫态和不同虫态的理论期距值和平均值标准差,准确地预测出某一虫态的始盛期、高峰期和盛末期。可为确定该种最佳的防治时期提供科学的依据。
Systemic data of teucome candida occurrence periods were desired by four years direct observation. We used symbolic statistic methods and fogured out theory distance value and average standard deviation of this insect in same state and different states,and forecast Scientific tests were provided for determining optimal vigorous period, fastigium period and telophase periods truly. date of prevention and control.
出处
《青海农林科技》
2007年第3期19-20,共2页
Science and Technology of Qinghai Agriculture and Forestry
关键词
杨毒蛾
期距值
标准差
预测预报
Leucoma Candida oistance value
Standard deviation
Forecast and prediction.
