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rhizopus head rot of sunflower

Plants are virtually immune to infection at Sclerotinia basal stalk rot and wilt, mid-stalk rot, head rot Sclerotinia sclerotiorum = Sclerotinia libertiana = Whetzelinia sclerotiorum. R. stolonifer, R. oryzae (syn. Date of this Version. Head rot, caused by one or more species of Rhizopus, occurs sporadically, causing rotting and shredding of the head similar to Sclerotinia head rot. The objective of this study was to determine the effects of head rot disease on seed yield in eight sunflower cultivars. The disease is common on … Rhizopus Head Rot of Sunflower in Nebraska G1677 Sunflower crops grown in Nebraska are susceptible to diseases caused by bacteria, viruses, and nematodes, but the most economically damaging is head rot, caused by the fungal pathogen Rhizopus. Rhizopus head rot is a common and often severe fungal disease of sunflowers primarily in the high plains of the USA. Sclerotinia sclerotiorum. Download DOWNLOADS. Rhizopus Head Rot. Sclerotinia head rot. NF00-426 Rhizopus Head Rot of Sunflower. Rhizopus head rot is more serious in southern sunflower production regions including Kansas, Nebraska, Colorado, and the Texas Panhandle. The results revealed that Rust Puccinia helianthi Puccinia xanthii Uromyces junci. The Rhizopus head rot pathogens require free moisture and a wound to successfully infect sunflower heads. The affected heads turn brown and mushy, and then brittle and hard as they dry out. Rhizopus head rot is caused by various fungi in the genus Rhizopus, including R. arrhizus, R. stolonifer, and R. microsporus. These species may occur singly or in a FIGURE 4 – White mycelium and black sclerotia on the face of a skeletonized sunflower head. Since June 17, 2009. head rot, and Rhizopus head rot. Rhizopus head rot has been reported from several areas of sunflower production in the world, including Australia, South Africa, and Mediterranean areas in Europe and India. In the United States, Rhizopus head rot has historically caused only minor and localized damage to sunflowers. Rhizopus Head Rot Introduction. Head rot disease is caused by several species in the genus Rhizopus, including R. stolonifer, R. arrhizus, R. oryzae, and R. microsporus. Included in. The disease appears first as dark spots on the back of ripening heads. The sunflower cultivars were inoculated by R. stolonifer at two different growth stages (R5.7 and R6.0) of sunflower. Wet weather following flowering is conducive to Rhizopus head rot. Head rot caused by Rhizopus stolonifer reduces sunflower seed yield and quality. The Rhizopus head rot pathogens require free moisture and a wound to successfully infect sunflower heads. Robert M. Harveson, University of Nebraska--Lincoln Follow. 2000. ... Abstract. This NebFact discusses the increase in sunflower production and the potential for diseases. While both are widely distributed, white mold is a more serious problem in northern production areas, such as North Dakota, South Dakota, and Minnesota. This 2007 NebGuide discusses the pathogen, disease history, symptoms, and management. Rhizopus head rot is caused by various fungi in the genus Rhizopus, including R. arrhizus, R. stolonifer, and R. microsporus. Sunflower crops grown in Nebraska are susceptible to diseases caused by bacteria, viruses and nematodes, but the most economically damaging is head rot, caused by the fungal pathogen Rhizopus. Rhizopus head rot Rhizopus arrhizus = Rhizopus nodosus Rhizopus microsporus Rhizopus stolonifer = Rhizopus nigricans. Authors. AUTHORS: Sam Markell, Tom Gulya, Charlie Block and Bob Harveson. These fungi are cosmopolitan in soil and decaying organic matter. R. arrhizus) and R. microsporus. These fungi are cosmopolitan in soil and decaying organic matter. Rhizopus head rot. 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