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EVALUATION OF THE FUNGICIDE EFFICIENCY FOR THE GRAY LEAF SPOT (Cercospora zeae-maydis) CONTROL IN CORN

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Author(s): NICÉSIO FILADELFO JANSSEN DE ALMEIDA PINTO | BRUNO DE ANGELIS | MARCELO HADIMU HABE

Journal: Revista Brasileira de Milho e Sorgo
ISSN 1676-689X

Volume: 3;
Issue: 1;
Start page: 139;
Date: 2004;
Original page

Keywords: Zea mays | fungus | grain production

ABSTRACT
The gray leaf spot of the corn, one of the most harmful foliar diseases of this crop, caused by the fungi Cercospora zeae-maydis, is now in Brazil, causing severe damage in Southwestern Goiás - GO. This experiment was carried out in a direct corn on corn crop area, in Montividíu, GO, infected with Cercospora zeae-maydis. The experimental design was randomized blocks, with 8 treatments in 4 replications. The simple hybrid Avant of precocious cycle was used. The fungicides were sprayed manually (CO2) at 40 pounds of pressure using 4 pulverizing spouts. The applied volume of fungicide in each plot was of 1.4 liters. The following fungicides (g a.i.ha-1) were used: propiconazole (100.0), propiconazole (125.0), difenoconazole (50.0), difenoconazole (75.0), azoxystrobin (50.0), azoxystrobin (75.0) e tebuconazole (200.0). Plot without fungicide constituted the check. The first spray was accomplished in the V8 stage (43 days after sowing - DAS) and the second spray in the pretasseling stage (58 DAS). At 85 DAS, plants with ears in the pasty grain stage, the evaluation of the foliar symptoms of gray leaf spot was proceeded, being graded 0 = symptomless; 1 = little lesions below the ear, any lesion above; 2 = much lesions below the ear, little lesions above; 3 = severe development of lesions below the ear, all the leaves above the ear with lesions; 4 = all the leaves with severe development of lesions, but green area still visible; 5 = all the leaves dry and dead. Thus the results show that the fungicides propiconazole, difenoconazole, azoxystrobin and tebuconazole are efficient in the control of the gray leaf spot (Cercospora zeae-maydis) of the corn and that all the fungicides increased the production of corn grains, being 38.9% the largest increment.
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