| 摘要: |
| 1983-1986年在河北省邯郸地区,从不同世代、不同虫量及不同类型棉田,采用自然感虫和人工控制虫量的开放式方法研究了棉铃虫对棉花的为害损失。结果得知每头二代幼虫为害蕾铃约13个、顶尖约0.5;每头三代幼虫约为害蕾铃14个。群体为害量与虫量的关系呈对数曲线变化。为害对产量的影响、主要决定于成铃数的多少,而对品质的影响则决定于造成霜前花的比例大小。由于棉花的补偿能力,低虫量为害对产量反有所增加;不同世代、不同类型田棉花的补偿能力不同,为制定经济阈值提供依据。通过对虫量与产值损失率的关系分析,建立了产值损失模型. |
| 关键词: 损失率 为害损失 虫量 补偿能力 棉花产量 不同世代 邯郸地区 棉铃虫 霜前花 不同类型 |
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| Abstract: |
| The effect to cotton yield and quality due to bollworm injury were studied with field experiments for different generations,and popula- tion density of bollworm,and different fertility levels of cotton fie- lds in Handan,Hebei in 1983-1986. The results revealed that:each larva of the second generation could consume about 13 Squares and bolls,and about 0.5 terminal buds in its whole larval stage,while those of the third brood could damage about 14 to 15 squares and bolls each.The relationship of injury by on... |
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