Fuzzy-similitude-priority and fuzzy-judgement of the dominant pests and their superior natural enemies in plum orchards.
The correlations of the major pests and the dominant natural enemies on quantity in plum orchards were analyzed by the method of fuzzy-similitude-priority(FSP)and fuzzy-judgement(FJ)in this paper.The results of FSP showed that the dominant natural enemy of Emposca larescens,was Tetragnathida,Misumenops tricuspidatus secondly;The dominant natural enemy of Myzus persicae was Chrysopa sinica,Propylaea japonica secondly;The dominant natural enemy of Cleoporus variabilis was Propylaea japonica,Leis axyridis secondly.The results of FJ showed that the dominant natural enemies of Emposca larescens,was also Tetragnathida.The results of FSP and FJ also showed the same trend.