Evaluation efficiency of severity of angular leaf spot in common bean based on diseased and healthy leaf area.

• Autor(a) principal: PARRELLA, R. A. da C.
• Data de Publicação: 2013
• Outros Autores: SANTOS, J. B. dos, PARRELLA, N. N. L. D., SILVA, D. V. F. e
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/978718
• topic: Pseudocercospora griseola; Leaf spotting; Phaseolus vulgaris; Feijão; Mancha angular; Doença de planta; Linhagem; Leaf area; Disease severity

This study compared severity of angular leaf spot in common bean lines, based on the healthy and diseased leaf area, and the graded scale. We used 12 common bean lines in the dry and rainy seasons. Two contiguous experiments were conducted in each season, with and without chemical control of the pathogen. We evaluated the percentage of the healthy and diseased leaf area; severity based on a graded scale and the area under the disease progress curve; and yield. The diseased or healthy leaf area is efficient to evaluate the severity of angular leaf spot with a sample of 20 to 30 leaflets per plot. For all traits, the results of central and border areas did not differ, indicating that the evaluation of border rows is unnecessary and, finally, the severity assessment of the upper plant half can discriminate the lines more efficiently.