Abstract:

Ecological space getting smaller, new shoots fast growing, tender leaf which cause harmful organism hazards collar-pruning tea garden. To improve the temperature and humidity conditions of tea garden and the population of natural enemies Phytoseiid mites by interplanting with Ageratum conyzoides can attain the objective of control the mites by mites. Three different kings of cultivation model tea test zone were set in test collar-pruning tea garden. There were the test tea garden interplanting with Ageratum conyzoides (test zone A), the test tea garden interplanting with Cassia tora (test zone B) and the weed clearing tea garden (test zone C). From May onwards, when Ageratum conyzoides grew up to 10-15 cm high, the growth and decline rate of Tarsonemid mites and its natural enemies Phytoseiid mites in three different kings of cultivation model test tea zone were investigated. And the temperature and humidity of test tea garden were recorded from July to August. There were a peak of Phytoseiid mites in test zone of A and B especially in test zone A. The peak of Phytoseiid mites in test zone C wasn’t obvious. In the period of peak of Tarsonemid mites and its natural enemies Phytoseiid mites, the density of Tarsonemid mites was up to 6.6 every shoot, the density of Phytoseiid mites was only 0.13 every shoot in the test zone C; The density of Tarsonemid mites was 5.3 every shoot, the density of Phytoseiid mites was 1.26 every shoot in the test zone B; In the test zone A the density of Tarsonemid mites was 2.1 every shoot, the density of Phytoseiid mites was 2.48 every shoot. In July and August, the average air temperature of test zone A and B reduced 2.57-2.84℃ and the average relative humidity increase 12%-13% in compared with test zone C. The biology-covering measure of interplanting with Ageratum conyzoides in collar-pruning tea garden can improve the microclimate of tea garden, provide food for Phytoseiid mites, create a living environment which is beneficial to increase the population of Phytoseiid mites, build a good manual complex ecosystem of tea and Ageratum conyzoides, and promote the ecological control effect of controlling mites with mites.