| Shandong,as a representative of the tea area in the north of the new type with unique geographical location and special climate conditions,tea production as a special industry,but relative to the conditions of southern tea area,the investigation of the basic information is relatively small,this study mainly aims at the tea plantations of taian jiuqu white tea co.,LTD.,through the system,using the principle and method of ecology,analyses the population dynamics and community characteristics of pests and natural enemies,the optimal partition of pests and natural enemies in order samples,clear the time pattern,to better provide theoretical basis for tea garden green pest control technology.1.A total of 42 species of pests(including mites)and natural enemies,belonging to 2classes,9 orders and 32 families,were found through 28 systematic investigations on tea plantations.There were 31 species of insect pests(including mites),consisting of 2 classes,5orders and 25 families,accounting for 73.81% of the total species.There were 11 species of natural enemies,consisting of 2 classes,5 orders and 7 families,accounting for 26.19% of the total species.The main pests(including mites)in the tea garden were Aleurocanthus spiniferus,Empoasca onukii,Apolygus lucorĪ¼m,Toxoptera aurantii,Scirtothrips dorsalis Hood,Caloptilia theivora,Acaphylla theae Watt and Calacarus carinatus.It was found that the main natural enemies of the tea plantation were the Eretmocerus Haldeman,Chrysopa sinica,Propylaea japonica,Episyrphus balteatus De Geer,Harmonia axyridis,Araneidae,Salticidae,etc.2.The relative abundance of main pests and natural enemies in tea plantation was analyzed.The results showed that the herbivorous group of the main pests and natural enemies in the tea plantation community accounted for 93.55% of the total number of individuals,and the main pests were stinging and sucking mouthparts pests and chewing mouthparts pests,which accounted for 75.59% and 15.97% of the total number of individuals,respectively.The biting and sucking mouthparts pests were Aleurocanthus spiniferus,which accounted for 48.16% of the total pests.Among the predatory natural enemies,lacewings,arachnids,ladybugs and hoverflies accounted for 0.45%,0.59%,0.64% and 0.84%of the total enemies,respectively.Among the parasitic natural enemies,the parasitoids were 3.9% of the total parasitic natural enemies.3.The dominant species of pests and natural enemies were analyzed according to the dominance index.During the whole growth period of the tea garden,the main pests were the Aleurocanthus spiniferus and Empoasca onukii.From June to early October,Aleurocanthus spiniferus was the dominant pest in tea plantation and maintained the most obvious dominance degree.From the beginning of the survey on June 9 to the end of the survey,except for the three surveys on October 17,and November 5,the occurrence of Aleurocanthus spiniferus and Empoasca onukii was always serious,which were the dominant pests of tea trees.From June to August,Eretmocerus Haldeman and Episyrphus balteatus De Geer is dominant natural enemy,the second is the Propylaea japonica and Harmonia axyridis,in September,Harmonia axyridis to keep the advantages of high degree,at the end of September to November,Chrysopa sinica to maintain dominance in groups of natural enemies,November to December,Araneidae became the highest dominance predators,from December to the end of the survey,the temperature drop,natural enemy species decreased dramatically,the dominance of the highest natural enemies is Episyrphus balteatus De Geer.4.The species richness,ecological dominance,diversity and evenness of the main pests and natural enemies in the tea plantation were analyzed.The optimal time series segmentation method was used to divide the time pattern of the main pests and natural enemies into four periods(June 9th-July 17 th,July 25th-September 12 th,September 20th-October 17 th,October 27th-December 23rd).The occurrence characteristics of pests and natural enemies in tea plantation were analyzed in combination with the factors of tea tree growing period and environmental conditions. |
