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对桃树树冠上、中、下3层及东、西、南、北4个方位桃一点叶蝉及其天敌草间小黑蛛的系统调查分析表明,桃一点叶蝉及其天敌草间小黑蛛种群在7个部位的聚集强度其5个判断指数都大于聚集格局的判断标准,证明桃一点叶蝉及其天敌草间小黑蛛种群7个部位均为聚集格局,Iwao公式m=α+β中的α值均大于0,表明个体间互相吸引,其中树冠中层和东面树冠平均拥挤度最高,而树冠下层和南面树冠最低,在时间上平均拥挤度为9月中旬最高。
The peach tree top, middle and lower three layers and east, west, south and north of four directions Peach Leafhopper and its natural enemies of small black spider grass system investigation and analysis showed that a little peach leafhopper and its natural enemies grass small The clustering intensity of black spider population at five sites was higher than that of the aggregation pattern. The results showed that all seven sites of the leafhopper and its natural enemies were clustered. The formula of Iwao m = α The values of α in + β are all greater than 0, indicating that the individuals attract each other. The average crown crowns in the middle crown and the east crown are the highest, while the crown crown in the crown and south crown is the lowest, with the average crowding time in mid-September being the highest.