การประชุมวิชาการระดับชาติ ครั้งที่ 16
มหาวิทยาลัยราชภัฏนครปฐม

The epidemic of sugarcane red rot wilt disease cause the reduction of yield (30-100% decreased) and sugar yield (31-75% decreased) in sugarcane, this disease is crucial and should be have monitored since sugarcane breeding program with testing the reaction for the selection of new sugarcane varieties. Hence, the aim of this study was evaluating the severity levels of C. falcatum and F. moniliforme, the causal agent of sugarcane red rot wilt disease in Suphanburi province for find out the most severe isolates, this research was surveyed and collected red midrib symptoms in sugarcane leaves in U Thong District, Song Phi Nong District, and Sam Chuk District, with twelve simples. Isolated using tissue transplanting method. The severity was tested using the wound Plug method with LK92-11, U Thong 8, U Thong 10, E-Hiao, and Khon Kaen 3 variety. Rating scores were done at 45 days after inoculation. The result showed that severity level of C. falcatum similar to F. moniliforme  with extended the symptom in sugarcane stalk and the highest level was the Sam Chuk isolation as 3.1 and 1.6 respectively followed by Song Phi Nong isolate and U Thong isolate. C. falcatum is more virulent than F. moniliforme. Moreover, the reactions with five sugarcane varieties were differenced according to the level of resistance of each sugarcane variety. C. falcatum and F. moniliforme Sam Chuk isolates will be used to study preservation methods and to test reaction of red rot wilt disease in the promising sugarcane clones for further certification of sugarcane varieties.