摘要
中国梨木虱一代卵在梨树上呈聚集分布，其聚集原因主要是由环境作用所致。当ｔ＝１．９６，Ｄ＝０．２时，最适抽样数为：Ｎ＝５５３．０２２／ｘ＋３９．５１４。若防治指标定为每中校基部１０个生长点累积卵数为４粒，则最大抽样数为１７８枝，防治的上下限为。
The egg of 1st generation of psyllia chinensis Yang et li is aggregation patterna on pear tree, and the cause of aggregation is by the enviornment.If t=1.96, D = 0.2, the theoretical sampling number is N = 553.022/X+39.514. If the indication of control is 4 eggs at the 10buds of middle stem posteriority, and the maximum sampling number is 178, the limite of control is
出处
《莱阳农学院学报》
1994年第1期42-45,共4页
Journal of Laiyang Agricultural College
关键词
中国梨木虱
一代卵
空间分布型
Pyllia chinensis
egg of lst generation spatial pattern
aggregation pattern
sampling
