桑盾蚧雌介壳在桃园中的空间分布特征研究

The Spatial Distribution of Female Shells of Pseudaulacaspis pentagona in Peach Orchard

１９９２～１９９３年对桑盾蚧（Ｐｓｅｕｄａｕｌａｃａｓｐｉｓｐｅｎｔａｇｏｎａ）雌介壳在５ａ～８ａ生桃树上的分布进行了研究。结果表明：桑盾蚧雌介壳在桃树不同方位枝条上所占树表皮面积和枝条受害程度均表现为南边＞东边＞西边＞北边，且雌介壳多集中于主枝上；主枝上空介壳多于小枝；在桃园中雌介壳呈聚集分布。

esearch results showed that the trends of the distribution of female shells onthe boughs of different direction and its damage to the boughs of peach trees were as fol-lows:the south>the east>the west>the north.Female shells mostly aggregated onthe boughs,but the empty shells on the boughs were more than those on the branches andtwigs. Female shells showed aggregated distribution in the peach orchard.