摘要
８０年代以来，河南省棉区棉红铃虫再度猖獗，其发生特点为：由豫南向豫北逐渐发展。发生期较５０年代有所延长；年度内田间生存率逐代提高，棉花受害逐代加重，不同种植和生长类型的棉田受害有显著差别；主害代为第三代，其年度间发生轻重主要受第三、四代棉铃虫防治频度和８、９月份降雨的影响。棉红铃虫对棉花的危害损失率Ｙ与单铃子棉含虫量（包括羽化孔）Ｘ呈幂函数关系，第二代为：Ｙ＝２．７４２Ｘ１．４１，第三代为：Ｙ＝５．４７５Ｘ０．９３６，据此模型估算的防治指标试用于生产，取得了成效。
Since l980’s,the pink bollworm is resurgence in Henan Province cotton areas。 Thefeatures of occurrence was the damage of pink bollworm gradually serious from the south tonorth cotton area sin Henan Provice,the period of the occurrence and damage of the pest isprolonged in comparison with the l950’s.the survival rate of the larvae in cotton field hasbeen increasing generation by generation. The 3rd generation is the major damage generation,and the lightness and heaviness of the degree of the occurrence of the pest among those years ismainly effected by control frequency of the 3rd and 4th generation of cotton bollworm and therainfall of July and August. the relationship between the damage loss rate(Y)of seed cottonand number of the larvae(X) per boll of seed cotton(involved the number of the hole of the emergence) was power function,the regression equation of the 2nd generation was Y=2.742X1.41;the 3rd generation was Y=5.475X0.936. Applications of the control thresholds based onthe models were exarnined in cotton field.A siginficant benefit was obtained。
出处
《棉花学报》
CSCD
北大核心
1994年第1期57-60,共4页
Cotton Science
关键词
棉红铃虫
生态学
经济阈值
pecttnophora gossypiella,ecological feature economic threshold
