黑点蚧种群空间分布型及抽样技术研究

黑点蚧种群田间分布为聚集型,其聚集强度在树冠不同部位有差异;聚块性以外层、南方、上段最高,内层、北方、下段最低。样方1叶时为均匀分布,2叶以上为聚集分布。黑点蚧雌蚧最佳抽样方式为棋盘式;对若蚧则各种方法均可采用。

PRELIMINARY STUDY ON THE SPACIAL PATTERNS AND SAMPLING METHODS OF CITRUS BLACK SCALE (Parlatoria zizyphus Lucas)

Black scale population spacial pattern in the fields presents an aggregated type, the aggregation intensities are different in different positions on the crowns of the trees. The patchiness in the outside, southern and the upper layer of the tree, is the highest, in the inside, northern and the lower layer it is the lowest. When the sample unit is one leaf, the spacial pattern is uniform, but when the sample unit increases,it becomes aggregated. The chessboard sampling method is most suitable for the female adult. But for the nymph, other methods can also be used.