Controle químico da mancha-bacteriana do tomate para processamento industrial em campo
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2013-03
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Resumo
In order to evaluate chemical control of bacterial spot on tomato
for industrial processing, two field trials were carried out at the
Unilever Bestfoods experimental station, in Goiânia, Goias state,
Brazil. The first trial was in a randomized complete block design,
with 15 treatments and three replications, using the hybrid Heinz
9992 inoculated with Xanthomonas perforans. The second trial was
in a split-plot randomized complete block design with chemical
foliar applications (10 treatments) and hybrids (Hypeel 108 and
U2006) as factors. Plants were inoculated with X. perforans and
X. gardneri. In both trials the chemicals, in different number of
applications and combinations, were: acibenzolar-S-methyl (ASM);
famoxadone + mancozeb; metiram + pyraclostrobin; phosphite PK;
benzalkonium chlorides; cuprous oxide, and copper hydroxide (SC,
WP and WG). For both trials, disease severity on leaves, number of
fruits with symptoms and yield were evaluated. In the second one,
sunscald was also evaluated. For the first trial, significant severity
differences (p>0.05) among treatments were observed only in the
first two evaluations, but none of them differed from the water check
control. In the second trial, significant differences were detected only
in foliar severity in first evaluation for hybrids. For number of fruits
with symptoms and sunscald, besides hybrids, interaction among
factors was also significant. ‘U2006’ was more resistant than ‘Hypeel
108’, which also had highest sunscald values, but concerning fruits
with symptoms, the opposite was observed. The two factors were
significant for yield data, ‘U2006’ yielded better than ‘Hypeel 108’.
Despite none of the treatments have differed in yield from the water
control, famoxadone + mancozeb, which resulted in the highest yield,
differed from copper hydroxide, ASM – famoxadone + mancozeb,
and benzalkonium chlorides. ASM and famoxadone + mancozeb were
those that promoted benefit/cost relation higher than 1.
Descrição
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Solanum lycopersicum, Agrotóxicos, Xanthomonas gardneri, Xanthomonas perforans, Indutor de resistência, Solanum lycopersicum, Xanthomonas perforans, Xanthomonas gardneri, Pesticides, Systemic acquired resistance inducer
Citação
NASCIMENTO, Abadia dos R.; FERNANDES, Paulo M.; BORGES, Lino Carlos; MOITA, Antonio W.; QUEZADO-DUVAL, Alice Maria. Controle químico da mancha-bacteriana do tomate para processamento industrial em campo. Horticultura Brasileira, Brasília, DF, v. 31, n. 1, p. 15-24, jan./mar. 2013.