Study on the Technology of Pest Control in Organic Tea Plantation in Sichuan
|Course||Agricultural Entomology and Pest Control|
|Keywords||Organic Tea Control technologies Population dynamics Composite panels Predation of|
Sichuan tea area tea producing areas in China, and the ecological environment of the area is superior, the tea plant is rich in resources. With the development of modern industry, the unreasonable application of pesticides and fertilizers, resulting in the pollution of the agricultural ecosystem, and the deterioration of ecological conditions, the quality of tea severely affected. Pesticide residues and heavy metal contamination, tea has become one of the most concern of the tea trade and consumers, organic tea came into being for this situation. In this study, the tea garden pest species undergoing complex undue reliance on chemical pesticides, tea pesticide residues exceeding the critical issues in the prevention, types of pests and their natural enemies, the tea garden pest populations occurred dynamic, physical control and biological control technology to filter out the best way for the organic tea garden pest control, and to provide a basis to regulate the organic tea garden pest control technology. The main contents and conclusions follows a clear Sichuan tea garden pests and natural enemies species collected in the different ecological zones of Sichuan Province Pujiang Mabian, Hongya organic tea garden in 2009, identification of pests (mites) a total of 9 orders, 38 families, 57 kinds. Among them, the Homoptera sucking pests most of 16, accounting for 28.07%, in the tea garden infestation the most heavy tea leafhopper spiniferus. The Coleoptera of The second dominant groups up to 13 species, accounting for 22.81%. Lepidopteran pests the third dominant groups, a total of nine species accounted for 15.79%. Tea garden natural enemies of 2 classes, 9 orders, 23 families, 34 species of Hymenoptera class of natural enemies most 7 Section 11 species, accounting for 32.35% of the total number of natural enemies. Second Araneae 6 families accounted for 26.47%, Coleoptera mesh natural enemies 2 families six kinds accounted for 17.65%. On this basis the List of the Sichuan tea garden pests (mites) and the Sichuan tea plantations natural enemies directory. 2 four tea plantations major pest population dynamic four major tea-growing areas in Pujiang pest population dynamics system. The results show that the spiny whitefly year 5 occurrence of the peak of the overwintering generation nymphs in the end of March, the first damage peak in early May, late April to late June are nymphs high incidence of early July, and In late August peak of twice, but the number was greatly reduced compared to previous gradually enter the overwintering period after October. Leafhopper year round insect population growth and decline was twice the peak nymphs in late March began early April insect population continued to grow, up to a full year maximum to late June. In late May to early August for a period of high and gradually enter the overwintering period after mid-October. Throughout the year there are two tea aphid occurrence of the peak period of April 20 to May 10, is the occurrence of the first peak of the second harm peak in September, but the population density is higher than the previous few. The insect population number of the sharp decline in October, up into the overwintering state. Side multi-food the tarsal lines mite infestation has three main peak, in May into, mites volume is less, in early May into the nymphs increased gradually, in mid-June of the annual maximum mites, the subsequent mites amount continued decline in early July in turn could rebound to two peaks in early August. Subsequently, the the mites amount gradually reduced, in mid-October into the winter period. 3 sex pheromone composite panels control the organic tea garden spiniferus the leafhopper effects significantly to control tea garden spiniferus Sichuan Pujiang organic tea garden application lure ordinary yellow plastic sheet combination of technologies (hereinafter referred to as the composite board) 2009-2010 significant leafhopper effect. The test results showed that the composite plates (3 plates / District): The case of the same density, compared with ordinary yellow plates (3 plates / area), composite panels trapping effect is significant. Peg board booby traps after 20 days composite panels Black assassination tabaci adults a total of 9618 / area the ordinary yellow board for 6410 / zone, the composite board attracting insects increase of 50.05%; composite panels trap and kill the leafhopper into nymphs a total of 676 / area, ordinary yellow plate 308 / area, doubling the amount of composite panels attracting insects, the differences between the two have reached a significant level. Number of attracting insects increased with the increase in the density of composite board hanging board, the amount of cell-attracting insects with marked increase in composite boards density increased, but the average each composite board of attracting insects but showed a decreasing trend with the increase in the number of composite panels, 20 days after the hanging board peg board density of the composite panels in each plot wrench, 3 boards, 4 boards and 5 board four treatments, trapping black assassination whitefly adult turn of 6195 / District, 9618 / District, 11860 / District and 12276 head / area, trapping leafhopper into nymphs sequence number 590 / District 676 / District, 898/648 / area. Sequentially the per plate spiniferus average amount of attracting insects: 3098 / board, 3206 / board, 2965 / plate and 2455 / board leafhopper per plate average of attracting insects sequentially: 287 head / board, 225 / board, 236 / plate and 126 / plate. 4 plates per cell composite board density attracting insects for maximum efficiency. From a the cell attracting insects total number of veneer attracting insects, the density of the peg board with the funds a combination of factors to consider, each plot board (ie per acre about 20 board) is the use of composite panels to trap and kill the the spiny whitefly adults and small green leaves The cicada nymphs optimal density. Per acre using the standard of 20 composite panels, large-scale demonstration in 2010: The results showed that after 20 days, composite board control the field spiniferus and the effect of leafhopper peg board increased by 18.26% and 16.04, respectively, than ordinary yellow plate %. 4 A. cucumeris contralateral tarsal line mites eat more predatory role of research in artificial climate chamber (temperature 25 ° C, relative humidity of 85 ± 5%, photoperiod 8L: 16D) conditions, the system studied A. cucumeris female adult mites contralateral tarsal more food line mites mite functional response of the state. The results showed that the functional response in line with the the Holling equation II type fitting A. cucumeris female adult mites contralateral polyphagia tarsal line mite egg, larva, nymphs and adult mites functional response equation Na = 0.4303N / (1 0.0125N); Na = 0.7806N / (1 0.0070N); Na = 0.4857N / (1 0.0092N); Na = 0.6188N / (1 0.0093N), R2 is 0.966-0.992, fit better. The female mite, mite, Amblyseius contralateral multi-a fresh tarsal line mites larva selection coefficient (1.52) is greater than the adult mites (1.12), contralateral tarsal line mites eat more eggs and nymphs selection coefficient were 0.6 and 0.76. Show that the the A. cucumeris preference predator side of the multi-food the tarsal lines mite larva and adult mites. Amblyseius mites female adult mites Predation by their density, predation rates decline with their own density increases.