%0 Journal Article
%T Rela£¿£¿o entre o teor de clorofila nas folhas e a severidade de brusone nas pan¨ªculas em arroz de terras altas
%A Silva-Lobo
%A Val¨¢cia L.
%A Filippi
%A Marta Cristina C.
%A Silva
%A Gisele B.
%A Venancio
%A Wemerson L.
%A Prabhu
%A Anne S.
%J Tropical Plant Pathology
%D 2012
%I Sociedade Brasileira de Fitopatologia
%R 10.1590/S1982-56762012000100011
%X rice blast (magnaporthe oryzae) is the most important yield limiting factor of upland rice in brazil. the nitrogen application rate and planting date determine the level of panicle blast severity. a field experiment was conducted with the cultivar brs bonan£¿a to establish the relationship between chlorophyll content in leaves and panicle blast severity. the layout was a randomized split plot design with three replications. the treatments included 12 planting dates at weekly intervals and five rates of nitrogen (0, 30, 60, 120 and 240 kg ha-1 of n). the chlorophyll content was measured on flag leaf with a chlorophyll meter. panicle blast severity increased significantly with the increase in nitrogen fertilization. the correlation between nitrogen rate and chlorophyll content in flag leaf was positive and significant (r=0.98; p < 0.01). the relationship between panicle blast severity and chlorophyll content was linear and positive (r= 0.99; p < 0.01). the chlorophyll content in the flag leaf can be included as independent variable in the development of a mathematical model for panicle blast forecasting.
%K oryzae sativa
%K pyricularia grisea
%K epidemiology.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1982-56762012000100011&lng=en&nrm=iso&tlng=en