INFLUENCE OF FOLIAR APPLICATION OF FUNGICIDES TO CONTROL
PHAEOSPHAERIA LEAF SPOT IN MAIZE
INFLUÊNCIA DA APLICAÇÃO FOLIAR DE FUNGICIDAS NO CONTROLE DA MANCHA DE PHAEOSPHAERIA NA CULTURA DO MILHOJosé Roberto Chaves Neto, Ricardo Boscaini, Ivan Francisco Dressler da Costa, Nívea Raquel Ledur, Renato Carnellosso Guerra, Wellington Mezzomo, Heriksen Higashi PuerariThe
objective of this study was to evaluate the effectiveness of foliar application
of fungicides to control Phaeosphaeria
leaf spot and consequently on the features of the maize crop productivity in
the crop year 2014/15. The experimental design was randomized blocks, in a 2x4
factorial scheme, with two hybrids, three treatments + a control in four
replications. The treatments were based on the following fungicides (g i.a L-1):
epoxiconazole + pyraclostrobin (333 + 167); cyproconazole + picoxystrobin (80 +
200); azoxystrobin + benzovinliflupyr (300 + 150), which were applied in
BG7051H and BG7060HR hybrids with knapsack/ manual sprayer, pressurized with CO2
in the phenological stage of culture V8, 70 days after seeding (70 DAS). The
experimental plot had four rows spaced at 0.50 m and length of 10.0 m,
resulting in a total area of 20 m2 and useful area of 8 m2,
which held the white spot severity assessments, grain yield (kg ha-1)
and thousand grain weight (g). Significant differences were observed for all
fungicides compared to the control. The control alone had the highest severity
index compared to the other treatments. Regarding the thousand grain weight and
productivity (kg ha-1), the azoxystrobin + solatenol treatment was
superior to the control and other treatments with fungicides, with a higher
production of grain compared to the control.
Zea mays L., chemical control, effectiveness of fungicides, Phaeosphaeria maydis.Artigo Completo