江汉平原地膜棉田二代红铃虫种群动态研究

A Study on the Population Dynamics of the Second Generation of Pink Bollworm in Cotton Field with Film Mulching in Jianghan Plain

根据１９８６～１９９５年历时１０ａ的系统观察资料，以同期移栽露地棉田为对照，对江汉平原地膜棉田二代红铃虫的种群动态进行了统计分析及较系统的研究。结果表明，地膜、露地两类棉田二代红铃虫的种群数量及田间发生动态均存在显著差异。１０ａ平均，地膜棉田二代红铃虫累计卵量是露地棉田的３．４倍；平均有卵株率是露地棉田的２．８倍；年发生程度较露地棉田提高１．７级；每年７次调查达到防治指标的次数年平均比露地棉田多２次，有些年份多达４～５次；实际需要用药防治的次数平均每年比露地棉田增加１次，有些年份增加２～３次。

Based on the systematic investigation data from 1986 to 1995, the population dynamics of the second generation of pink bollworm (Pectinophora gossypiella) in cotton field with film mulching was compared with that in cotton field without film mulching. The population dynamics were systematicly analysed. The result showed that the population and occurrence dynamics of the second generation of pink bollworm were significantly different in the two different cotton fields. The accumulation of egg amount in the field with film mulching was 3.4 times as that in the field without film mulching. The percentage of the plant with egg existed in the field was 2.8 times as that in the field without film mulching, and the degree of occurrence of the second generation of pink bollworm was increased by 1.7 grades. The threshold reached, in the field with film mulching, was 2 times more than that without film mulching, with sometimes 4￣5 times more. The times needed control practice in the field with film mulching increased 1, sometimes 2￣3 when compared with that in field without film mulching.