| 棉花不同生育期棉蚜危害损失及防治指标的研究 |
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| 引用本文： | 高宗仁 郭良仁. 棉花不同生育期棉蚜危害损失及防治指标的研究[J]. 华北农学报, 1989, 4(3): 60-66 |
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| 作者姓名： | 高宗仁 郭良仁 |
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| 作者单位： | 河南省农科院植保所 郑州(高宗仁，罗印凡)，河南省太康县农业局 太康(郭良仁) |
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| 摘 要： | 1980—1986年,通过田间试验,研究了棉蚜对棉花的危害损失,平均单株蚜量(x)与籽棉产量损失率(y)的关系:出苗至3片真叶期为y=-38,574+11.645Inx;4—6片真叶期为y=-49.633+11.232lnx;成株期(伏蚜)为y=-28.802+5.465lnx.在经济允许损失为1%左右时,三个生育期的棉蚜防治指标分别为平均每株30—50头,每株80头左右,和每株(3片叶)200头左右.经生产示范,执行本指标可减少药剂防治2—3次,有明显的经济效益和生态效益.
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| 关 键 词： | 棉蚜 虫害 防治指标 棉花 |
Economic Threshold for Cotton Aphids (Aphis gossypii Glover) on Different Development Stages of Cotton in Henan Province |
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| Gao Zongren Luo Yinfan. Economic Threshold for Cotton Aphids (Aphis gossypii Glover) on Different Development Stages of Cotton in Henan Province[J]. Acta Agriculturae Boreali-Sinica, 1989, 4(3): 60-66 |
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| Authors: | Gao Zongren Luo Yinfan |
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| Abstract: | Studies were carried out in Henan province in 1980-1986 to determine the loss caused by aphids on yield of cotton. Six-seven grades of aphid number were established in field trials by using insecticide spray at different stages of cotton growth. The subsequent development of regression equation, the exact economic threshold for cotton aphid on cotton is given. The calculated economic thresholds were 30-50 aphids/plant for the stage before three-leaves stage of cotton, 80 aphids/plant for the 4-6 leaves stages and 200 aphids/plant(three leaves)more or less for maturity stage of cotton,respectively.Aphid number accumulation on developing stage of cotton showed negative linear relationships with the yield, and insecticides should be applied before population reached critical level of aphids at different growth stage of cotton. |
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| Keywords: | Cotton aphid Damage Economic threshold |
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