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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Evaluation for Antibiosis Resistance in Cotton to Helicoverpa armigera Larvae) ผู้เขียน: ดร.ประภารัจ หอมจันทน์, ศาสตราจารย์ , นางอรุณี วงศ์ปิยะสถิตย์, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe antibiotic effect of the new cotton lines, NR1, NR2, NR3, NR4 and NR5 and the control, SR3, on selected developmental parameters of the 2nd instar Helicoverpa armigera larvae was investigated. The larvae were fed on four diet types of each variety/line: fresh leaf, fresh square, artificial diet mixed with lyophilized powder of leaf and artificial diet mixed with lyophilized powder of square. RCB design was employed with four replicates. Each replicate had 10 diet cups of each variety/line with one larva. The results showed that the larval and pupal weights and the adult longevity of larvae reared on all diet types from NR1 were significantly lower and the larval period was significantly longer than those from SR3. The larvae produced on 4 diets from the other tested lines were found to have only some parameters significantly differed from the control. Fresh leaves/squares had better antibiotic effects on the bollworm development than the mixed diet with dried parts. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Field Trial and Agronomic Performance Naturally-Colored Cotton: Antibiosis and Leaf Damaging Tests Against Key Insect Pests, ) ผู้เขียน:ดร.ประภารัจ หอมจันทน์, ศาสตราจารย์, นางอรุณี วงศ์ปิยะสถิตย์, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractLaboratory tests were conducted to acquire the antibiotic effect of white and naturally-colored cotton varieties/lines, AP2, PM1 and PM4 compared to the control, SR60, using fresh leaves fed to the 3rd instar Helicoverpa armigera larvae. There were no significant differences found in the developmental times and weights of the bollworm larvae and pupae fed on the leaves of the different cotton varieties/ lines except for the percentage of adult abnormalities in PM1and PM4. The leaf damage by the leafhoppers was undertaken in a greenhouse using adult and nymph leafhoppers released in a screen cage containing one month-old cotton plants of each variety/line grown in pots. After 14 days, the results revealed that AP2 had the lowest score for hopperburn rating (3.5). Cotton variety trials in sprayed and unsprayed plots were conducted during 2006 and 2007 at two locations, the Field Crop Research Center at Nakhon Ratchasima and a farmer’s field at Thongpapoom, Kanchanaburi. The mean annual number of key pests and the annual yield of each variety/line at each location were compared and the average agronomic performance of each variety/ line was HVI analyzed. At Nakhon Ratchasima, leafhoppers were more abundant than aphids and whiteflies in both 2006 and 2007. There was a significant difference in the mean leafhopper numbers for AP2 and PM4 between both plots during the two years, while for PM1 there was a significant difference in 2007 only. Seed weights of SR60 and PM1 differed between the sprayed and unsprayed plots in 2006. At Tongpapoom, Kanchanaburi, both SR60 and PM4 in 2006, and PM4 again in 2007 had significantly different amounts of leafhopper between the sprayed and unsprayed plots. The yield of SR60 in the sprayed plot significantly differed from the unsprayed plots in 2006. Agronomic performance of each cotton fiber found only micronaire range in PM1 from Thongpapoom and the fiber lengths of SR60, AP2 and PM1 grown at Nakhon Ratchasima to be designated as premium. At Tongpapoom, the AP2 fiber length fell in the base range. The percent lint of AP2 was the highest at Nakhon Ratchasima, while PM4 had the lowest value for this parameter at both locations. |
หัวเรื่อง:การแสดงออกของลักษณะความต้านทานแบบ antibiosis ต่อหนอนเจาะฝัก (Heliothis armigera Hubner) ในถั่วเหลือง 3 สายพันธุ์ ผู้เขียน:นายพรพันธ์ ภู่พร้อมพันธุ์, ดร.พีระศักดิ์ ศรีนิเวศน์, ศาสตราจารย์ ,  เจริญศักดิ์ โรจนฤทธิ์พิเชษฐ์ สื่อสิ่งพิมพ์:pdf AbstractThe experiment was aimed at studying for antibiosis resistance to pod borer in three soybean lines, viz. SJ4 (susceptible variety), SJ4 X G2105 F2-7-7-127 (breeding line) and G2105 (resistant line). The first instar of Heliothis armigera larvae were fed on mature leaves, inflorescences and young pods of three soybean lines in the laboratory. The larval and pupal weight after feeding on mature leaves were significantly different. The weights of those fed on mature leaves of SJ4 X G2105 F2-7-7-127 were higher than those fed on G2105, but lower than those on SJ4. The greatest larval mortality was observed after feeding on mature leaves, inflorescences and young pods of G2105. Less mortality rate was found after feeding on SJ4 X G2105 F2-7-7-127 and on SJ4, respectively. |
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