| Popis: |
To protect and utilize reasonably nature enemies,and provide scientifically sampling methods,in the this study,spatial relationships of natural enemies with Empoasca vitis(Gothe) and Toxoptera aurantii(Boyer) from late September to late November in 2010,respectively,were investigated in the four kinds of tea gardens of different cultivars(i.e."Shu" tea,"Ping yang te zao" tea,"Fu yun-six" tea and "Long jing chang ye" tea) in Hefei suburban district,China.The ranges of spatial dependence(RSDs) of natural enemies and Empoasca vitis(Gothe) as well as Toxoptera aurantii(Boyer) were,respectively,calculated by the method of geostatistics,and the spatial relationships among enemies and pests were analyzed using grey relational analysis.The results showed that Empoasca vitis(Gothe),Toxoptera aurantii(Boyer) and four kinds of natural enemies(i.e.Misumenops tricuspidatus Fabr.,Theridion ocomaculatum Bose.et Str.,Oxyopes sertatus L.Koch and Erigonidium graminicolum Sundevall),respectively,displayed aggregative distribution pattern in the four kinds of tea gardens.The relational grade analysis showed that the two main enemies of Oxyopes sertatus L.Koch and Erigonidium graminicolum Sundevall,respectively,have consanguineous relation with Empoasca vitis(Gothe) and Toxoptera aurantii(Boyer) in spatial following relationships in the "Shu" tea garden.Whereas Theridion ocomaculatum Bose.et Str.and Oxyopes sertatus L.Koch,respectively,have very tight connection with Empoasca vitis(Gothe) and Toxoptera aurantii(Boyer) in spatial following relationships in the "Ping yang te zao" tea garden. Specially,in the all four kinds of tea gardens,the most amount of Empoasca vitis Gothe and Toxoptera aurantii Boyer appeared on November 25,2010,and the two kinds of insect pests and the four kinds of natural enemies,respectively,displayed aggregative distribution pattern in the "Fu yun-six" and "Long jing chang ye" tea gardens.Whilst the results showed that the main enemy of Empoasca vitis Gothe was Oxyopes sertatus L.Koch in "Fu yun-six" tea field,and Theridion ocomaculatum Bose.et Str.in "Long jing chang ye" tea field.While the main enemy of Toxoptera aurantii Boyer was Oxyopes sertatus L.Koch in the two kinds of tea fields.Moreover,our findings indicated that the RSDs of Oxyopes sertatus L.Koch in the two kinds of tea fields were 4.7222 and 7.6316,respectively.In conclusion,the present results revealed that the most main enemy of Empoasca vitis Gothe and Toxoptera aurantii was Oxyopes sertatus L.Koch Boyer in spatial following relationships in the four kinds of tea gardens in autumn-winter season,and then was Theridion ocomaculatum Bose.et Str.and Erigonidium graminicolum Sundevall. |
