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Sugar Beet (Beta vulgaris)-Nematode, Beet Cyst By O. Neher and C. M. Ocamb Cause Heterodera schachtii is a sedentary endoparasite with a relatively small host range. Other crop hosts are mangel-wurzel, table beet, cabbage, cauliflower, Brussels sprouts, b ...
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Sugar Beet (Beta vulgaris)-Nematode, Root-knot Cause Meloidogyne hapla is a sedentary endoparasite; only second-stage juveniles (the infective stage) and adult males (which may be rare) are in soil. Symptoms Beets are stunted in small, conspicuous areas o ...
Sugar Beet (Beta vulgaris)-Phoma Leaf Spot and Root Rot By O. Neher and C. M. Ocamb Cause Phoma betae, a fungus that attacks seedlings, leaves, and roots in the field and in storage. It often enters wounds during the growing season and at harvest. The dis ...
Sugar Beet (Beta vulgaris)-Phytophthora Root Rot and Pythium Root Rot By O. Neher and C. M. Ocamb Cause The fungus-like soilborne organisms, Phytophthora drechsleri and Pythium aphanidermatum, cause root rot primarily in waterlogged soils at high temperat ...
Sugar Beet (Beta vulgaris)-Powdery Mildew By O. Neher and C. M. Ocamb Cause The fungus, Erysiphe betae (syn = E. polygoni, Microsphaera betae), affects plants in the Polygonaceae. The disease has been widespread in several Western States since 1974. Funga ...
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Sugar Beet (Beta vulgaris)-Ramularia Leaf Spot Cause Ramularia beticola, a fungus. Most likely it is seedborne. It is believed to persist in beet debris at least 1 year. The disease is not considered an economic problem. Symptoms Leaf spots, which occur o ...
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Sugar Beet (Beta vulgaris)-Rhizoctonia Root and Crown Rot By O. Neher and C. M. Ocamb Cause Rhizoctonia solani is a fungus that survives primarily as mycelium or sclerotia in plant debris. Rhizoctonia solani becomes active when soil is 77°F to 91°F, attac ...
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Sugar Beet (Beta vulgaris)-Rhizomania By O. Nehers and C. M. Ocamb Cause A virus (Beet necrotic yellow vein virus) transmitted by a fungus (Polymyxa betae) commonly found in soil. The disease was first detected in Idaho, Wyoming, and Nebraska in 1992. Inf ...
Sunflower (Helianthus spp.)-Powdery Mildew Cause The fungi, Golovinomyces cichoracearum (formerly Erysiphe cichoracearum), has been reported from Idaho and Washington and G. spadiceus has been reported from Washington. Podosphaera xanthii and G. ambrosiae ...
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Sunflower (Helianthus spp.)-Sclerotinia Wilt and Head Rot Cause The fungus Sclerotinia sclerotiorum overwinters as black sclerotia in soil, among seeds, and in plant debris for 3 to 7 years. Dry, cool soil conditions favor survival of sclerotia. Sclerotia ...
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