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Smoke Tree (Cotinus coggygria)-Verticillium Wilt Cause Verticillium dahliae, a soilborne fungus that affects many annual and perennial plant species. The fungus produces microsclerotia in the tissues of diseased plants. Microsclerotia are released into th ...
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Snapdragon (Antirrhinum majus)-Botrytis Blight See: Greenhouse Plants, Ornamental- Gray Mold Chemical control Best used with cultural controls. Tank-mix and/or alternate products with different modes of action to prevent the buildup of resistant fungi. Li ...
Snapdragon (Antirrhinum majus)-Damping-off Cause Both Pythium spp. a fungus-like microorganism and Rhizoctonia solani, a fungus, can cause pre- and post-emergence damping-off. Pythium irregulare, the species found frequently in the Northeastern United Sta ...
Snapdragon (Antirrhinum majus)-Downy Mildew Cause The fungus-like organism Peronospora antirrhini causes a systemic infection of young snapdragons. The disease is favored by cool, wet conditions and/or high humidity. Spores are produced between 44°F and 7 ...
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Snapdragon (Antirrhinum majus)-Impatiens Necrotic Spot See: Greenhouse Plants, Ornamental- Impatiens Necrotic Spot Symptoms Round, white, or tan leaf spots up to a quarter inch in diameter. Stem necrosis and wilting is frequent, which causes tissues to tu ...
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Snapdragon (Antirrhinum majus)-Powdery Mildew Cause The fungus Golovinomyces orontii (formerly Erysiphe cichoracearum) has been reported from Washington. Conidia are released in response to abrupt decreases in relative humidity. Wind blows conidia to heal ...
Snapdragon (Antirrhinum majus)-Rust Cause Puccinia antirrhini, a fungus carried in diseased cuttings or spread by wind-blown rain, splashing water or clothes. Spores can also be spread by wind over long distances. Two races of the fungus have been identif ...
Snowberry (Symphoricarpos spp.)-Leaf Spots Cause Many fungi are capable of causing necrotic leaf spots on snowberry. Of these, Phyllosticta symphoricarpi, Ascochyta tenerrima, Septoria symphoricarpi, and Sphaceloma symphoricarpi (anthracnose) are reported ...
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Snowberry (Symphoricarpos spp.)-Powdery Mildew Cause The fungus Erysiphe diffusa (formerly Microsphaera diffusa) has been reported from Oregon, Washington and Idaho while Podosphaera clandestine has been reported from Washington and Idaho. Symptoms White ...
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Soybean (Glycine max)-Soybean Rust Cause Two fungi, Phakopsora pachyrhizi and P. meibomiae, cause rust on soybean, snap bean, dry bean, cowpea, and numerous other legume species. P. pachyrhizi is considered the more aggressive strain on soybean and also i ...