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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Sampling Technique in Rice Pest Management: A Tool for the Rice Growing Farmers at Buang Thong Lang Village in Lam Luk Ka Sub-district, Pathum Thani Province, Thailand) ผู้เขียน: Ngawang, Apichai Daorai,  นายสุรเชษฐ จามรมาน, รองศาสตราจารย์ , Somsak Thongdeethae สื่อสิ่งพิมพ์:pdf AbstractBuang Thong Lang village at Lam Luk Ka sub-district, Pathum Thani province was the area where the experiments were conducted for two consecutive rice cropping seasons, February-May 2004 and July- November 2004. It was aimed to assess effectiveness of sampling tactics through visual counting of pests from randomly selected rice hills. Pesticide spraying schedule was administered through the determination of economic threshold of rice pests. The study comprised of four farmers’ fields in a locality each of which was compared for grain yield, net returns taking into account the ecological aspects. The net economic benefits and presence of counts on natural enemies in an experimental plot were high which showed comparative advantages over the indecisive pesticide use driven traditional practices. It was concluded that the trends in present integrated pest management strategies designed for the farmers’ situation needed timely and accurate information on identification of the key pests before drastic chemical actions are deployed. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluating Four Bioassay Techniques for Insecticide Resistance
Monitoring in Helicoverpa armigera (Lepidoptera: Noctuidae)) ผู้เขียน:Geremew Terefe, นายสุรเชษฐ จามรมาน, รองศาสตราจารย์, ดร.ประภารัจ หอมจันทน์, ศาสตราจารย์ , Apichai Daorai, Supranee Impithuksa สื่อสิ่งพิมพ์:pdf AbstractLaboratory studies were performed on Helicoverpa armigera strain collected from Werer
Agricultural Research Center cotton fields to investigate resistance to the field rates of profenofos,
endosulfan and lambdacyhalothrin using adult vial, topical application, square dip and larval immersion
techniques. It was found that LD50 values of endosulfan, profenofos and lambdacyhalothrin in the third
instar topical bioassay were 29.84, 4.068 and 0.18 mg/g body weight, respectively. In the square dip test
profenofos (Calofos) resulted in 100% kill at two-times lower dose (1.25 ? 10-3 g a.i/ml) and 86.67%
larval deaths were observed at four-times lower dose. Endosulfan (Ethiosulfan) gave 99.33% only at the
field rate (5.25 ? 10-3 g a.i/ml). Lambdacyhalothrin (Karate) was observed to yield 99.33% larval death
at eight-times lower dose (6.25 ? 10-5 g a.i/ml) than the field rate. In larval immersion experiment
lambdacyhalothrin and profenofos gave 98.33 and 99.33% kills at eight-time lower dose, respectively,
while endosulfan expressed 96.67% efficacy only at the field rate. LC50, and LC90 in adult vial test for
endosulfan were found to be 1.333 and 3.099 mg/ml, respectively. However, the observed high mortality
(> 25%) in control treatments warranted reevaluation of adult vial technique. Square dip technique was
found easy and economical. |