关键词: 棉蚜, 聚类分析, 高氏距离分析, 形态特征, 棉蚜, 聚类分析, 高氏距离分析, 形态特征

Abstract: Numerical taxonomy studies for intraspecies differentiation of cotton aphids were carried out with the measurement of fourteen morphological characters of the cotton aphids on four summer host plants, during two growth stages of cotton and under three temperatures in laboratory respectively.The results of cluster and Gower distance analyses showed that among four summer hosts,there were no differences either between seedling aphids with the green and yellow color or dwarf aphids with the five segment and six segment antenna. But the population differentiation were significant between the aphids on cotton seedling and on potato and between the aphids on cotton seedling and the dwarf aphids (summer aphids). The laboratory populations under 30℃ or the yellow color seedling aphids tended to be analogous with dwarf aphids. Seven main morphological characters were analyzed for differentiating such intraspecies populations.

Key words: Aphis gossypii Glover, cluster analysis, Gower distance, morphological characters, Aphis gossypii Glover, cluster analysis, Gower distance, morphological characte rs