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本文采用多种聚集度指标对椰子树Cocos nuciferaL.上的椰心叶甲Brontispa longissima(Gestro)幼虫的空间分布型进行了研究,结果表明:椰心叶甲幼虫空间分布为聚集分布;其幼虫虫口密度在不同心叶及心叶不同部位上差异极显著,并且第一片心叶上幼虫虫口密度与整株幼虫数量显著相关,利用公式y=5.70+1.26x可推算整株椰子树的幼虫虫口密度。分析寄主受害斑与虫口密度的关系表明,寄主受害斑的长(x1)、宽(x2)、长与宽交互作用(x3=x1x2)三个因子与椰心叶甲虫口密度(y)成正相关,模型y=11.81-2.69x2+0.10x3可预测全树幼虫虫口密度。
In this paper, the spatial distribution patterns of Brontispa longissima (Gestro) larvae on cocos nuciferaL. Were studied by using a variety of aggregation degree indexes. The results showed that the spatial distribution of larvae was aggregated and distributed; There were significant differences in different parts of the heart and leaves, and the density of larvae in the first heart leaf was significantly correlated with the number of whole larvae. The formula of y = 5.70 + 1.26x was used to calculate the larval population density of the whole coconut tree. The analysis of the relationship between host damage spots and insect population density showed that the three factors of length (x1), width (x2), length and width interaction (x3 = x1x2) were positively correlated with the population density (y) = 11.81-2.69x2 + 0.10x3 Predict population density of whole tree larvae.