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Controle químico da brusone em arroz de terras altas: efeitos nos fungos não alvos do filoplano; Chemical control of upland rice blast: effects on fungi not targeted by phylloplane

Gonçalves, Fábio José; Silva, Gisele Barata da; Filippi, Marta Cristina Corsi de; Araújo, Leila Garcês de
Fonte: Alexsander Seleguini Publicador: Alexsander Seleguini
Tipo: Artigo de Revista Científica
PT_BR
Relevância na Pesquisa
27.36%
v. 42, n. 1, p. 77-81, jan./mar. 2012.; Upland rice blast significantly affects yield, requiring one or two fungicides applications to control it. However, the effect of fungicides on beneficial fungi and on fungi not targeted by rice phylloplane are unknown. This study aimed to evaluate the effect of fungicides on panicle blast control, on fungi not targeted by rice phylloplane, and to study the antibiosis of fungi not targeted by M. oryzae. A field experiment was conducted by using two cultivars (Primavera and Bonança), four fungicides (trifloxistrobina + propiconazol, azoxistrobina, tebuconazol, and triciclazol) and a control, with a randomized blocks design, in a split-plot scheme, and four replications. The panicle blast severity, leaf chlorophyll content, number of colony-forming units cm-² of leaf area, and antibiosis were assessed. The Primavera cultivar showed higher panicle blast severity than Bonança. The fungicides azoxistrobina and trifloxistrobina + propiconazol significantly differed from the control, showing the lowest panicle blast severities. The fungicides did not affect the chlorophyll content, but differences were noticed between the cultivars. The fungicides tebuconazol, trifloxistrobina + propiconazol, and azoxistrobina significantly reduced the phylloplane fungi...