Study of the Spatial Relationships of Frankliniella Intonsa and Brevipalpus Obovatus Donnadieu with Their Natural Predators in Anji White Tea Garden

Key words: 
• Frankliniella intonsa；Brevipalpus obov atus Donnadieu；grey correlation degree；ecological niche analyses；dominant natural enemies /
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Abstract: Spiders and ladybird enemies are the main biological resources of biological control of insect pests .In order to reasonably protect and utilize natural enemies for pest control ,system survey of main pests and natural enemies was conducted in Anji white tea garden .Then the quantity ,and the temporal and spatial relationships of Frankliniella intonsa and Brevipalpus obov atus Donnadieu with their predators were analyzed by using grey relational and ecological niche analyses .It was determined that the five domi‐nant natural predators of Frankliniella intonsa were Clubiona j aponicola , Erigonidium graminicolum , Propylea j aponica ,Leis axyridis and Tetragnatha m axillosa .And the five dominant natural predators of Brevipalpus obov atus Donnadieu were Erigonidium graminicolum ,Plexip pus paykulli ,Clubiona j a‐ponicola ,Oxyopes sertatus and Tetragnatha squamata .The results also showed that the spatial pattern of Frankliniella intonsa were all gathered pattern in five times .The |w |values of Frankliniella intonsa with five main natural enemies were all less than 13.462 9 ,which means that the gathered degree difference was not significant between them .The λ values of gathering average of Frankliniella intonsa was great than two ,indicating that the aggregation of Frankliniella intonsa were caused by itself .And the aggregation of Propylea j aponica were also caused by itself .But the aggregation of other four kinds enemies were caused by different environmental factors .The distribution pattern of Breuip alpus obov atus Donnadieu was ran‐dom pattern in May 25 ,and the other days were gathered pattern .The |w | values of Brevipalpus obov a‐tus Donnadieu with five main natural enemies were all less than 13.462 9 ,which means that the gathered difference was not significant .The λ values of gathering average of Brev ipalpus obov atus Donnadieu was 2.039 7 in June 9 ,indicating that the aggregation of it was caused by itself .However ,the aggregation of the other four days of Brevipalpus obov atus Donnadieu and its five enemies were caused by different envi‐ronmental factors .