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The incidence of Sclerotinia minor was assessed in seed of two peanut (Arachis hypogaea L.) varieties (VA 81B and Florigiant) harvested from two fields in Virginia exhibiting disease symptoms typical of Sclerotinia blight. The incidence of S. minor in peanut seed with pink, light brown and dark brown testae riding a 6.4 × 25.4 mm screen averaged 1.5, 3.9 and 6.0%, respectively, from both fields. Similar trends were evident with colonization of seed by other fungi. The incidence of S. minor from pieces of testa removed from seed from both fields averaged 3.4% and 2.6%, respectively. However, the incidence of S. minor from seed cotyledons with testae removed was extremely low (<0.1%). Sclerotia of S. minor were not observed on, in or under the testa of seed or between the cotyledons of seed in prepared seed lots (lots containing only seed with pink and light brown testae). BOTEC, a seed treatment fungicide applied at recommended rate (2.5 g/kg), reduced the incidence of S. minor in peanut seed from 4.5% to 0.1%. Similar decreases were noted in other seedbome fungi commonly associated with peanut seed.
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Keywords: seed transmission, Sclerotinia blight, seed infestation, Fungi, seed protectants
How to Cite:
Porter, D. & Taber, R. & Smith, D., (1989) “The Incidence and Survival of Sclerotinia Minor in Peanut Seed”, Peanut Science 16(2), p.113-115. doi: https://doi.org/10.3146/i0095-3679-16-2-13