Sanogo S, Puppala N
Plant Pathologist, Department of Entomology, Plant Pathology, and Weed Science, New Mexico State University, Las Cruces, NM 88003.
Peanut Breeder, Clovis Agricultural Science Center, New Mexico State University, Clovis, NM 88101.
Plant Dis. 2007 Sep;91(9):1077-1082. doi: 10.1094/PDIS-91-9-1077.
A sclerotia-forming fungus was isolated from a peanut field in eastern New Mexico, where Valencia peanut is grown. The isolated fungus was typified by its darkly pigmented mycelium when grown on culture media, with pigmentation influenced by media. The optimal temperature range for mycelial growth was 20 to 25°C. In pathogenicity tests, the fungus caused water-soaked and light tan lesions on stems at points of inoculation, and lesions progressed up the stems into petioles followed by collapse of leaves. White fluffy mycelium and sclerotia were present on inoculated plants. Based on the examination of morphological and cultural characteristics of sclerotia, apothecia, asci, and ascospores, the isolated fungus with darkly pigmented mycelium on culture media was identified as Sclerotinia sclerotiorum. This study is the first report of S. sclerotiorum on peanut in New Mexico.
从新墨西哥州东部种植瓦伦西亚花生的花生田中分离出一种形成菌核的真菌。分离出的真菌在培养基上生长时，其特征是菌丝体颜色深，色素沉着受培养基影响。菌丝体生长的最佳温度范围是20至25°C。在致病性试验中，该真菌在接种点的茎上引起水渍状和浅褐色病斑，病斑沿茎向上发展到叶柄，随后叶片枯萎。接种的植株上出现白色绒毛状菌丝体和菌核。根据对菌核、子囊盘、子囊和子囊孢子的形态和培养特征的检查，在培养基上菌丝体颜色深的分离真菌被鉴定为核盘菌。本研究是新墨西哥州花生上核盘菌的首次报道。
