| 稻纵卷叶螟与褐稻虱混合种群经济阈值的研究 |
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| 引用本文： | 蒋杰贤,陈永年,潘桐.稻纵卷叶螟与褐稻虱混合种群经济阈值的研究[J].湖南农业大学学报(自然科学版),1994(4). |
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| 作者姓名： | 蒋杰贤 陈永年 潘桐 |
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| 作者单位： | 衡阳医学院，湖南农业大学农学系 |
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| 摘 要： | 采用二次回归通用旋转组合设计，探讨了１９８７年晚稻“圭巴”品种小区笼罩条件下稻纵卷叶螟、褐稻虱及其混合种群为害损失率和经济阈值．稻纵卷叶螟经济阈值因生育期不同而异，每百蔸幼虫分蘖期为１２１．３头，抽穗期为１３１．２头．褐稻虱抽穗期的经济阈值为百蔸４９４头若虫．本文提出了抽穗期稻纵卷叶螟、褐稻虱混合为害的产量损失率模型，在生产实践中，可直接利用此模型进行防治决策．
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| 关 键 词： | 稻纵卷叶螟，稻飞虱，病虫害防治方法／混合种群，经济阈值 |
A STUDY ON THE ECONOMIC THRESHOLD FOR THE MIXED POPULATION OF CNAPHALOCROCIS MEDINALIS GUENEE AND NILAPARV ATA LUGENS STAL |
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| Jiang Jiexiang,Chen Yongniang,pan Tong.A STUDY ON THE ECONOMIC THRESHOLD FOR THE MIXED POPULATION OF CNAPHALOCROCIS MEDINALIS GUENEE AND NILAPARV ATA LUGENS STAL[J].Journal of Hunan Agricultural University,1994(4). |
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| Authors: | Jiang Jiexiang Chen Yongniang pan Tong |
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| Abstract: | The injurious loss caused by Cnaphalocrocis medinalis,Nilaparvata lugensstal,their mixed population damage and their economic threshold(ET)were studied by regres-sion rotational combinational design in cage condition in this paper.The results were as fol- lows:The ET of rice leaffolder varies with different rice growth stages,its ET is 121.3 sec-ond instar larvae per 100 plants at tillering stage,131.21 second instar larvae per 100 plantsat initial heading stage.The ET of brown planthopper is 494 fourth instar nymph at rice ini-tial heading stage.The ET of mixed population can be determined according to the regressiveequation. |
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| Keywords: | Cnaphalocrocis medinalis rice leaf rollers Nilaparvata lugens rice plant hop-pers pest control methods/pest mixed population economic threshold |
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