| 红铃虫为害棉铃的损失分析和经济阈值的探讨 |
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| 引用本文： | 曹赤阳,束春娥.红铃虫为害棉铃的损失分析和经济阈值的探讨[J].植物保护学报,1986,13(1):1-7. |
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| 作者姓名： | 曹赤阳 束春娥 |
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| 作者单位： | 江苏省农科院植保所，江苏省农科院植保所 |
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| 摘 要： | 用大田取样调查资料分析了第二代和第三代红铃虫对棉铃的为害损失。被害样本的损失表现在铃重减轻和品级下降。样本单铃活虫数与重量损失率具有幂函数回归关系。二代为y=6.65x~(.9763),三代为y=5.42~(.9575)。虫量与品级具直线回归关系,二代为y’(级别)=1.4x(虫量)+1.3,三代为y’=1.2x+1.3(不计小数)。经济阈值(经济允许虫量)和防治指标是按Chiang,H.C.(1979)模式按照幂函数关系修正为由于棉花产量随时间进程渐增,因而经济阈值和防治指标也呈动态交化。设计了微机运算程序以适应在防治方法、防治次数、产量、价格变化时的运算。
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THE INVESTIGATION OF BOLL DAMAGE CAUSED BY PINK BOLLWORM (PECTINOPHORA GOSSYPIELLA SAUND.) AND THE ESTIMATION OF ECONOMIC THRESHOLD |
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| Cao Chiyang and Shu Chune.THE INVESTIGATION OF BOLL DAMAGE CAUSED BY PINK BOLLWORM (PECTINOPHORA GOSSYPIELLA SAUND.) AND THE ESTIMATION OF ECONOMIC THRESHOLD[J].Acta Phytophylacica Sinica,1986,13(1):1-7. |
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| Authors: | Cao Chiyang and Shu Chune |
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| Institution: | Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences and Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences |
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| Abstract: | Data from field samples of cotton bolls infested by the pink bollworm were analysed. The damage caused by the 2nd and 3rd generation pink bollworm larvae includes the reduction of the weight of seed cotton and the degradation of the lint quality.The degree of damage was correlated with the average number of living larvae in bolls. It could be expressed by the non linear regeession models:Y=6.65X·9763 (in 2nd generation) and Y=5.42X·9575 (in 3rd generation) for the rate of reduction of boll weight.The lint quality could be expressed in linear regression as Y(grade of lint)=1.4X(no.of larvae)+1.3 in 2nd generation and Y=1.2X+1.3 in 3rd generation. The economic threshold was calculated with the model of Chiang, H. C. (1979) and some modifications were made for adapting to the character of non linear regression between the number of larvae in the boll and the rate of damage.The modified model is lg ET=lg(CC/ECY·A·P·SC)/B.The calculated ET reveal a dynamic form as the yield of seed cotton is increasing in the growing season and is also varying with the changing of parameters in the model. |
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