%0 Journal Article
%T Reaction of corn genotypes to eyespot caused by Kabatiella zeae Rea  o de gen¨®tipos de milho ¨¤ mancha ocular causada por Kabatiella zeae
%A Rubia Cristiani Camochena
%A Idalmir dos Santos
%A Claudia Manteli
%A Gustavo Malawi
%J Semina : Ci¨ºncias Agr¨¢rias
%D 2012
%I Universidade Estadual de Londrina
%X The objective of this study was to evaluate the reaction of corn genotypes to eyespot caused by Kabatiella zeae under natural field conditions. The assay was carried out during the 2006/2007 growing season, in Pato Branco-Paran¨¢ State, consisting of 33 hybrids and two sowing seasons, on 10/13 and 12/27/2006, respectively; and in the 2007/2008 growing season, in the same place, with 10 hybrids and two sowing seasons, on 10/20 and 11/12/2007, respectively, and in Palma Sola-Santa Catarina State, with 8 hybrids and one sowing season, on 09/30/2007. Disease intensity was determined by means of severity evaluations. The observed corn plant reactions allowed genotypes with different levels of eyespot resistance to be discriminated. Hybrids AG 9020 and SPRINT were the most susceptible to the disease, while AS 1565 and DKB 234 were the most resistant; this behavior was repeated in both years and growing seasons. It was concluded that the variation in susceptibility to eyespot among the hybrids tested, may have been influenced by ambient conditions. O objetivo deste trabalho foi avaliar a rea  o de gen¨®tipos de milho quanto ¨¤ mancha ocular causada por Kabatiella zeae sob condi  es naturais de infec  o. Os ensaios foram instalados na safra 2006/2007, no munic¨ªpio de Pato Branco, PR, com 33 h¨ªbridos e com duas ¨¦pocas de semeadura, dia 13/10 e 27/12/2006, respectivamente; e na safra 2007/2008, no mesmo munic¨ªpio, com 10 h¨ªbridos e com duas ¨¦pocas de semeadura, dia 20/10 e 12/11/2007, respectivamente e no munic¨ªpio de Palma Sola, SC, com oito h¨ªbridos e com uma ¨¦poca de semeadura, dia 30/09/2007. A intensidade da doen a foi determinada pela avalia  o de severidade em todos os h¨ªbridos de milho, em diferentes est¨¢dios de desenvolvimento. As rea  es de milho observadas permitem separar estatisticamente gen¨®tipos com diferentes n¨ªveis de resist¨ºncia ¨¤ mancha ocular. Os h¨ªbridos AG 9020 e SPRINT apresentaram maior suscetibilidade ¨¤ doen a, e AS 1565 e DKB 234, maior resist¨ºncia, repetindo este comportamento nos dois anos e ¨¦pocas de cultivo. Concluiu-se que a varia  o na suscetibilidade ¨¤ mancha ocular entre os h¨ªbridos de milho testados, pode ter sido influenciada pelas condi  es ambientais.
%K Doen as do milho
%K Resist¨ºncia gen¨¦tica.
%U http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/7029