Centro Internacional de Agricultura Tropical (CIAT)

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Signatura: 24698.
Autor: Sengooba, T.N.K.
Título: Angular leaf spot disease of beans (Phaseolus vulgaris L.) caused by Phaeoisariopsis griseola (Sacc.) Ferr. in Uganda. Thesis (M.Sc.).
Idioma: eng.
P.imprenta: Makerere University.Kampala, UG.1980.291 p.
Descriptores:Phaseolus vulgaris;Isariopsis griseola;Disease control;Chemical control;Uganda;Africa;DISEASES AND PATHOGENS;Mycoses;Pest control;PestsFrijol;Beans;Thesis;Tesis
2do.Resumen: A study was undertaken at Kawanda Research Station (Uganda) to investigate the pathogen Phaeoisariopsis griseola, host and environmental factors which affect the development of angular leaf spot disease, and how it can be controlled. The studies revealed that although conidia of P. griseola germinate in water, they germinate faster and more completely in nutrient solutions. The highest germination was recorded when 105 conidia/ml were germinated in a 0.5 percent solution of lactose at 25 degrees Celsius. The fungus grew and sporulated best on PDA and bean agar, resp., under alternating dark and light periods than under either continuous light or darkness. Conidia germinated and entered the host through the stomata. Disease severity was found to vary with the cv., the age of the crop, and with the environmental conditions. Infected off-season crops and volunteer plants can be a source of the primary inoculum. Benomyl was the most effective fungicide for control as compared with triphenyltin acetate and mancozeb.


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