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Variation for nine virulence and four electrophoretic characters was determined for 69 samples of Colletotrichum gloeosporioides collected in five natural stands of its host, Stylosanthes guianensis, in South America. Virulence phenotypes varied from four in the Quilichao population to 22 in the ...


Lenne, J.M.Burdon, J.J.[Preliminary study of virulence and isozymic variation in natural populations of Colletotrichum gloeosporioides from Stylosanthes guianensis]Preliminary study of virulence and isozymic variation in natural populations of Colletotrichum gloeosporioides from Stylosanthes guianensis

Diseases of Aeschynomene spp. observed in forage evaluation trials in South America and Florida, U.S.A. are described and discussed. Newly discovered diseases include Polythrincium sp. leaf blotch, Calonectria sp. dieback, and Rhizoctonia solani Kuhn foliar blight. Diseases previously reported fr...


Sonoda, RMLenne, J.M.[Diseases of Aeschynomene species]Diseases of Aeschynomene species
Lenne, J.M.Hernández Romero, Luis Alfredo[Primer registro de pudricion carbonosa de Stylosanthes guianesis en Colombia]Primer registro de pudricion carbonosa de Stylosanthes guianesis en Colombia
Autor: Lenne, J.M.

Native populations of Stylosanthes capitata, a promising perennial pasture legume in tropical America, were evaluated for their reaction to a virulent widespread race of Colletotrichum gloeosporioides. Considerable variation in anthracnose reaction among progenies from individual plants, among pl...


Lenne, J.M.[Variation in reaction to anthracnose within native Stylosanthes capitata populations in Minas Gerais, Brazil]Variation in reaction to anthracnose within native Stylosanthes capitata populations in Minas Gerais, Brazil

During field screening from 1978 to 1981 of 121 accessions of the tropical pasture legume Stylosanthes capitata at two sites in Colombia and at Planaltina in Brazil, 94.2% of the accessions were resistant to anthracnose (caused by Colletotrichum gloeosporioides) in Colombia while 85.1% were susce...


Lenne, J.M.Thomas, D.Andrade, Ronaldo P. deVargas, A.[Anthracnose of Stylosanthes capitata: Implications for future disease evaluations of indigenous tropical pasture legumes]Anthracnose of Stylosanthes capitata: Implications for future disease evaluations of indigenous tropical pasture legumes

A previously undescribed leaf spot of Centrosema spp. in Colombia and Costa Rica was found to be caused by Cylindrocladium colhounii. Symptoms included irregular, zonate, brown leaf spots, 10–30 mm in diameter; chlorosis; and defoliation. Pastures of Centrosema acutifolium cv. Vichada in the east...


Lenne, J.M.Vargas de Alvarez, A.[Leaf spot of Centrosema species caused by Cylindrocladium colhounii]Leaf spot of Centrosema species caused by Cylindrocladium colhounii

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