 หัวเรื่อง:ความสัมพันธ์ระหว่างระดับความรุนแรงของการเกิดโรคใบจุดเหลี่ยมกับความเสียหาของผลผลิตถั่วแดงหลวงในสภาพไร่ ผู้เขียน: Parichut Junplang,  นายณรงค์ สิงห์บุระอุดม, รองศาสตราจารย์ , Pairoj Jungbhanich, นายสุรพล อุปดิสสกุล, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe relationship between disease severity and yield lossses of 6 varieties of red kidney bean had been conducted both in rainny and dry season in the field. The results of statistical analysis revealed the existence of the negative correlation between disease severity and garonomic characters. It indicated that as the dissease severity 4 increased, height at maturity, day to maturity, number of pods per plant, number of diseasse-free pods per plant, number of seeds per pods of non infected and infected pods, 100 seeds weight and grain yield were decreased. The angular leaf spot disease reduced yield of red kidney beanin rainny season to 59.44, 88.84, 140.09 and 177.33 kg/rai and 44.56, 71.43, 84.87 and 100.13 kg/rai in dry season when the level of disease severity increased to 2, 3, 4 and 5 respectively. The results of this study suggested that the assessment of yield losses of red kidney bean due to angular leaf spot disease in rainny season can be estimated by linear regression ? = 466.07 - 42.53 x and ? = 375.59 - 24.02 x for dry season. (where ? is estimated gain yield and is the observation of disease rating based on percent of infected leaf area.) |
หัวเรื่อง:ขบวนการเกิดโรคใบจุดเหลี่ยมของถั่วแดงหลวง (Phaseolus vulgaris L) ผู้เขียน:Parichut Junplang, นายณรงค์ สิงห์บุระอุดม, รองศาสตราจารย์, Pairoj Jungbhanich สื่อสิ่งพิมพ์:pdf AbstractThe penetration of the fungus Phaeoisariopsis griseola (Sacc.) Ferraris was an indirect penetration. Within 48 hours after inoculation, the conidia on red kidney bean leaf surface germinated germ tube and formed appressorium at the penetrated through stomata. Infected hypha grew in substomatal cavity and expanded to reach mesophyll, parenchyma, palisade and epidermis cells. It later ramified extensively in intercellular space. Disease symptom firstly appeared in the form of pale yellowish spot ten days after inoculation and subswquent growth of infected hypha was intracellular. Hypha was aggregated to form stroma in substomatal cavity. Conidiophore was produced and emerged from stomata to produce conidia. Sporulation was completed within 4 days after disease symptom appeared. |