ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Phosphine Resistance in Thai Local Strains of Tribolium castaneum (Herbst) and Their Response to Synthetic Pheromone)

ผู้เขียน:Chawalit Jittanun, วิบูลย์ จงรัตนเมธีกุล

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Abstract

Tribolium castaneum (Herbst), one of the key pests of stored grains worldwide, has been reported to develop resistance to fumigants in several countries. This research was focused on assessing the toxicity of phosphine against two local strains of T. castaneum from Thailand by comparison with the standard susceptible strain (QTC-4) from Australia and evaluating the response of the selected strain to synthetic pheromone. By bioassay under laboratory conditions, it was found that T. castaneum collected from an animal feed mill in Samut Prakan province (SP strain) exhibited resistance to phosphine with resistance ratios of 3–25.8 while the strain from Khon Kaen province (KK strain) showed a much lower resistance level with resistance ratios of 1–1.45. The SP and KK strains were then observed for their responses to the pheromone in an arena of 1 m3 in a glass cage. The results showed that synthetic pheromone could attract female beetles to the traps. Traps containing synthetic pheromone caught a significantly higher number of beetles than those of the untreated control. However, when comparing the response of the resistant strain (SP) with that of the susceptible strain (KK), it was found that both pheromone traps and untreated traps caught significantly lower numbers of resistant females than the susceptible ones. This may have been due to the resistant beetles being less active and wandering around less than the susceptible beetles. The lower response of resistant beetles to pheromone suggested that there is a need to find other alternatives for a monitoring system in areas where resistant populations occur in order to be able to make proper pest management decisions.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 048, Issue 1, Jan 14 - Feb 14, Page 9 - 16 |  PDF |  Page

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Repellency, Fumigant and Contact Toxicities of Litsea cubeba (Lour.) Persoon Against Sitophilus zeamais Motschulsky and Tribolium castaneum (Herbst))

ผู้เขียน:Ko Ko, ดร.วราภรณ์ จันทรจำนงค์, ผู้ช่วยศาสตราจารย์, ดร.อังศุมาลย์ จันทราปัตย์, ศาสตราจารย์

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Abstract

Litsea cubeba is found in many parts of Thailand and has medicinal properties. Mature fruit of L. cubeba was collected from Doi Ang-khang, in the Fang District of Chiang Mai Province, Thailand in June 2007 and the essential oil was extracted by a water-distillation method. The insecticidal properties of L. cubeba were evaluated under laboratory conditions. The results showed that the essential oil of L. cubeba strongly repelled Sitophilus zeamais and Tribolium castaneum even at low concentrations, but its repellency was more marked toward T. castaneum. Of interest was the fact that the repellency against T. castaneum was fairly consistent over the 5 h period of the experiment. Moreover, it showed both contact and fumigant toxicities against the tested species. Probit analysis showed that S. zeamais was more susceptible than T. castaneum in both the fumigant and contact bioassays. Hence, the essential oil of L. cubeba might be used as an alternative for grain protection against stored-grain insects. Further studies are needed prior to its commercial use.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 043, Issue 1, Jan 09 - Mar 09, Page 56 - 63 |  PDF |  Page