摘要
该技术体系包括３部分内容：１）棉花苗蚜特定时间生命表及其应用系统；内含小苗期和大苗期２个特定时间生命表，可根据生命表中的生命期望值（ＥＸ）大于１来确定防治关键期，用它指导防治苗蚜，可减少用药１～３次；２）棉花苗蚜为害程度与产量损失优化模型系统。即卷叶株率（ｘ）与产量损失（ｙ）的优化模型：小苗期ｙ（１～３真叶期）＝－０．３８９０＋０．３８８６Ｘ，大苗期为（ｙ）（４～８真叶期）＝９．５６６２＋０．２３０７ｘ，其小苗期和大苗期经济允许为害损失水平分别为４．１３％和１５．９％．３）其卷叶株率（ｙ）与百株蚜量（ｘ）的回归预测式为：小苗期为ｙ（１～３真叶期）＝４．２３８４＋０．０３５１Ｘ，大苗期为ｙ（４～８真叶期）＝１８．６３２６＋０．００６９Ｘ．因此，在中低产棉区，棉花苗蚜小苗期的防治指标为卷叶株率１１．６７％或百株蚜量２１２头，大苗期苗蚜防治指标为卷叶株率２７．４６％或百株蚜量１４６０头。
The technique system includes three parts: 1. The time-specific life table of cotton aphids in the seedling stage and its using system; It'S two life tables. By using Ex > 1 todetermine key period of control, 1￣3 times of insecticide application could be reduced. 2. Thedynamic medel of the yield lOSS based on aphid injury; It included two linear regressionequations in which X=percentage of curly leaved plant, Y=percentage of yield loss in 1￣3and 4￣8 true leaves stages: Y(1￣3)=￣0. 3890+ 0. 3886X ; Y (4￣ 8)=9. 5662+0.2307X.EIL (1￣3) = 4.13% ; EIL (4￣8) = 15. 9%. 4. The action threshold system. Therelationship between percentage of curly leaved plant (Y) and the aphids population per 100plant (X)can be expressed as: y(1 ￣ 3) = 4. 2385 +0. 351X; Y(4￣ 8) =18. 6326 + 0. 0069X. Based on EIL, the action threshold of cotton aphids in 1￣3 and 4￣8 true leaves stage 5 inthe low or middle output field of cotton were 11. 67% and 27. 46% of curly leaved plants orrepresented as 212 and 1460 aphids per 100 plant respectively.
出处
《河北农业大学学报》
CAS
CSCD
北大核心
1995年第2期9-16,共8页
Journal of Hebei Agricultural University
关键词
棉花
苗蚜
特定时间生命表
优化模型
防治指标
Cotton aphids in the seedling stage
time-specific Life table
dynamic moded
action threshold
