为明确枣食芽象甲越冬幼虫的空间分布和抽样技术，为该虫预测预报和综合防治提供理论依据，应用8种聚集度指标、Taylor幂法则和Iwao线性回归分析法，对枣食芽象甲越冬幼虫在枣园土壤中的空间分布型和抽样技术进行研究。结果表明：枣食芽象甲越冬幼虫的空间分布呈聚集分布，种群分布的基本成分是个体群，且聚集是由环境因素或者自身的聚集习性引起的；根据Iwao m*-m关系的序贯抽样决策模型确定了枣食芽象甲越冬幼虫的序贯抽样模型和最适理论抽样公式；当枣食芽象甲幼虫防治阈值为30头/株，10株调查枣树虫口密度大于342头，则需采取措施及时进行防治。本研究建立的序贯抽样模型和最适理论抽样公式可用于该象甲越冬幼虫调查、预测预报和综合防治。
Abstract
The study aims to clarify the spatial distribution and sampling technique of overwintering larvae of Scythropus yasumatsui Kono et Morimoto and provide theoretical basis for making forecast and integrated control of the pest. Spatial distribution and sampling technique of the overwintering larvae of this weevil in soilwere investigated by using 8 aggregation indexes, Taylor′s power law and Iwao’s regression analysis methods. The results showed that the overwintering larvae had an aggregated spatial pattern, the basic component of distribution was individual group and the aggregation of the overwintering larvae of this weevil was due to the environmental factors. The sequential sampling formula and the most suitable theoretical sampling number could be calculated by the Iwao’s m*-m. It was necessary to take actions when the weevil larva numbers were more than 342 heads/10 plants and the control threshold of larva was 30 heads per plant. The model can be used to survey, forecast and control of the pest.
关键词
枣食芽象甲;越冬幼虫;空间分布型;抽样技术
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Key words
Scythropus yasunatsui Kono et Morimoto; overwintering larvae; spatial distribution pattern; sampling technique
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