 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Monitoring Insecticide Resistance Development in Beet Armyworm, Spodoptera exigua (H?bner) (Lepidoptera: Noctuidae)) ผู้เขียน: Md. Abdullah, Ouab Sarnthoy,  ดร.ศิริพรรณ ตันตาคม, รองศาสตราจารย์ , Somchai Isichaikul, ดร.สุดาวรรณ เชยชมศรี สื่อสิ่งพิมพ์:pdf AbstractField collected larvae of beet armyworm, Spodoptera exigua (H?bner) were reared and evaluated for resistance against cypermethrin 10 EC, neem extract (Azadirachtin 0.1%) and Bacillus thuringiensis Berliner var. kurstaki (53,000 SU per mg) for 12 generations under laboratory condition by using leaf dip bioassay. Cypermethrin showed LC50 value of 251 ppm at F1 generation and decreased gradually to onward generations resulting LC50 value of 90 ppm at F12 generation for non-selection, whereas LC50 increased rapidly with a value of 8625 ppm at F12 generation under selection pressure. Neem extract exhibited LC50 value ranging from 3.98 ppm to 9.99 ppm for non-selection, whereas under selection pressure LC50 ranged from 4.38 ppm to 13.04 ppm throughout the generations. Bacillus thuringiensis var. kurstaki showed LC50 value which ranged from 7.3 ? 106 SU/L to 15.9 ? 106 SU/L for non-selection, and selection for resistance monitoring gave LC50 value ranged from 7.6 ? 106 SU/L to 73.9 ? 106 SU/L . Compared with non-selection strain, selection strain exhibited 95.83-fold, 1.44-fold and 5.6-fold increase in the LC50 for 12 generations against cypermethrin, neem extract and Bacillus thuringiensis var. kurstaki, respectively. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : New Records of Two Nasutitermitinae Termites (Isoptera: Termitidae) from Hill Evergreen Forest on Khao Kitchakut National Park in Thailand) ผู้เขียน:ดร.วีรวรรณ อมรศักดิ์, ผู้ช่วยศาสตราจารย์ , Ouab Sarnthoy, นายณิศ กีร์ติบุตร, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractTwo new unidentified species of termites genera of Subfamily Nasutitermitinae (Isoptera: Termitidae), Hospitalitermes sp. and Bulbitermes sp. collected from Khao Kitchakut National Park in Thailand are reported. The taxonomic status of these unidentified termites species has not been completely resolved. Soldier bodies, head capsules, pronotum, antennae, and nasus are illustrated for undescribed Hospitalitermes sp. and Bulbitermes sp. Alate and worker of Hospitalitermes sp. are also shown. Morphologically, the arboreal nests of Hospitalitermes sp. is provided. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Belt-Transect: A sampling Device for Termite Communitite Study) ผู้เขียน:Yanyong Chalermsan, Ouab Sarnthoy, นายณิศ กีร์ติบุตร, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe termite community, which is one of the key roles in the carbon cycle of ecosystems, had been studied from Tropical rain forest ecosystems in Chanthaburi, Thailand. The belt-transect sampling method was applied to monitor termite communities in moist-evergreen forest (MEF), hill-evergreen forest (HEF) and dry-evergreen forest (DEF) during December 1999-January 2001. Data obtained by belt- transect sampling described the characteristics of termite’s community in terms of its diversity and distribution. The results showed that MEF obtained the highest diversity of 2.10. DEF and HEF had lower H-index results of 1.72 and 1.49 respectively. Termite communities in the MEF and HEF had regular distribution of ?2/? <1 but approached random distribution, (?2/? <1), in DEF with termite species. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : A Probit Analysis of the Disinfestation of Mangosteens by Cold Treatment Againts the Larval Stages of the Oriental Fruit Fly (Bactrocera dorsalis (Hendel)) ( Diptera : Tephr ผู้เขียน:ดร.อินทวัฒน์ บุรีคำ, รองศาสตราจารย์ , Ouab Sarnthoy, นายโกศล เจริญสม, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe presence of the oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera : Tephritidae), in Thailand restricts entry of mangosteens to some foreign markets because of plant quarantine regulations. Mangosteens infested with third instar larvae of B. dorsalis were held at 5, 6 and 7oC for ?, ?, 1, 2, 4, 8, 11, 14, 16 and 20 days. Probit regression lines were fitted to the data of the relationship between exposure time and mortality of the insect. The exposure times required to kill B. dorsalis in mangosteens at 99.9968% mortality (probit 9), based on the recovery of puparia or adults, were calculated to be 19.4, 24.9 and 24.9 days for fruit treated at 5, 6 and 7oC, respectively. Attempts to find alternative procedures given the criterion of probit 9 were discussed. |