Comparison of yield damage of tropical maize hybrids caused by anthracnose stalk rot

Autor(es)

Matiello, Rodrigo R. ^[1] ; Lopes, Maria Teresa G. ^[2] ; Brunelli, Katia R. ^[3] ; Camargo, Luis Eduardo A. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Ponta Grossa, Dept Fitotecnia & Fitossanidade, BR-84030900 Ponta Grossa, PR - Brazil

^[2] Univ Fed Amazonas, Fac Ciencias Agr, Dept Prod Anim & Vegetal, BR-69077000 Manaus, Amazonas - Brazil

^[3] Sakata Seed Sudamer, BR-12906840 Braganca Paulista, SP - Brazil

^[4] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Fitopatol & Nematol, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TROPICAL PLANT PATHOLOGY; v. 38, n. 2, p. 128-132, MAR-APR 2013.
• Citações Web of Science: 4

Resumo

The objective of this study was to estimate the reduction in yield caused by Colletotrichum graminicola in resistant and susceptible maize hybrids inoculated at different stages of development. Two trials were conducted in different environmental conditions in a randomized block design with treatments arranged as a 2 x 5 factorial scheme and three replications. Treatments consisted of two hybrids (H8664, resistant and H8621, susceptible) inoculated at three growing stages (8-leaf, 12-leaf and tasseling stage). Internal lesion length, adjusted yield, and yield components (length, diameter and ear weight) were evaluated 120 days after emergence. Significant differences in yield and ear weight were detected in the susceptible hybrid inoculated at the earliest stage: yield was reduced by 16.1 and 20.2% in the first and second experiment, respectively. Although lesion length in the susceptible hybrid was approximately three times greater than in the resistant, there were no significant differences in lesion length among treatments for each hybrid. However, there were differences in the number of dead plants and ear weight. It is suggested that damage caused by early infection with C. graminicola results mainly from plant death and reduction in ear weigh rather than from the extent of colonization of the stalk. (AU)

• Processo FAPESP: 01/02793-0 - Genes de resistência a patógenos em milho e trigo: caracterização por meio de marcadores moleculares
• Beneficiário: Luis Eduardo Aranha Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular