04080cas|a2200433 a 4500 20260817171458.0 300300s1999 th uu|m rtt 0| a1eng d .b11783527 AIT Thesis no.AC-99-01 Le Thi Thu Huong Biological control of red spider mite (Oligonychus coffeae) on tea plants in Thai Nguyen Province, Vietnam Bangkok : Asian Institute of Technology, 1999 62 leaves Thesis ; no. AC-99-01 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1999 Tea is the principal crop and main resource income of the people in upland area in northern Vietnam. Tea plant has been grown as perennial crop in upland area so its attacked by many pests. Red spider mite (Oligonychus coffeae, Acarinae: Tetranychus) is one of the most damaging tea pest in northern Vietnam. The current tea management strategies heavily depend on chemical means. The chemical with strong effect to the pests but also give negative effect to natural enemies and human health as well. In this context, the current study was done to find out the possibility to control red spider mite by biological control. In this study, population of red spider mite and natural enemies were assessment from 5 farmers fields. It was showed that the density of red spider mite was higher in the fields with has not applied neither irrigated nor shade trees. The red spider mite population was observed correlated with rainfall, it normally high level of the density in dry weather condition. The predatory spider (Araneae order), two beetles (Coccinellidae and Staphylinidea) and predator mite (Phytoseiidea) which observed in the fields as well as in the laboratory were effectiveness in order to control red spider mite. The effectiveness of pesticide propargite (COMITE 75 EC) was studied both in the fields and in the laboratory. This result was shown that this pesticide has strong effect not only to the red spider mite but also to the predators. Results from survey involving farmers, extension and plant protection officers showed that the current farmers' practiced for controlling red spider mite was mainly chemical pesticide, followed by IPM (Integrated Pest Management) practice, and cultural practices. The majority of the farmers in study area spray pesticide without recommended from officers and they harvested after spray less than 20 days, The IPM program has been disseminated by officers and its interested by number of farmer 82% in the study area and 48% in whole province. Pests Biological control Mites Biological control Hansen, Gunner Kjer, Chairperson Banpot Napompeth, Co-chairperson Salokhe, Vilas M., Examination Committee Halwart, Matthias, Examination committee Danish International Development Assistance (DANIDA), Scholarship donor Asian Institute of Technology. Thesis ; no. AC-99-01 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12258 .b11783527 mnait u 240329 0 000330 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120585822 CREATED : 1998-10-31 RECORD # : i12184378 LPATRON : 1017973 LCHKIN : 2005-10-19 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 6 TOT RENEW : 1 Barcode : 30050120585830 CREATED : 1998-10-31 RECORD # : i1218438x LPATRON : 1021897 LCHKIN : 2014-07-05 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 5 TOT RENEW : 2 Barcode : 30050160053848 CREATED : 2016-05-18 RECORD # : i12982957 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 12379 12379 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AC-99-01 30050120585822 2026-08-17 17:14:59 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AC-99-01 30050120585830 2026-08-17 17:14:59 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.AC-99-01 30050160053848 2026-08-17 17:14:59 1 2026-08-17 40