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Ciência Rural

versão impressa ISSN 0103-8478versão On-line ISSN 1678-4596

Resumo

PERUCH, Luiz Augusto Martins  e  BRUNA, Emílio Della. Relation between doses of Bordeaux mixture and phosphites potassium on the intensity of Downy Mildew on grape cv. 'Goethe'. Cienc. Rural [online]. 2008, vol.38, n.9, pp.2413-2418. ISSN 1678-4596.  https://doi.org/10.1590/S0103-84782008000900001.

The Downy Mildew, considered the most important disease of grape, causes great damage to the culture in the South of Brazil. News aspects of control, like new substances, should still be studied to reduce disease intensity. The objective of this research was to evaluate efficiency of Bordeaux mixture and phosphites on control of downy mildew and productivity of grape cv. 'Goethe' in the South Coastal of Santa Catarina, Brazil. The concentrations tested of 0.0; 0.1; 0.2; 0.4 e 0.8% of the fungicide and the foliage fertilizer were evaluated in a DBC factorial scheme with three repetitions. The AACPD, bunch diseased incidence (incidence) and productivity were submitted to regression analyses and F test. Differences were observed for AACPD and incidence for concentrations, but not to different treatments and interactions between treatments and concentrations. The doses of 0.4% Bordeaux mixture and 0.3% phosphite reduced the AACPD in 98 and 94% and incidence in 46 and 76%, respectively. Phytotoxycity symptoms were observed in 0.8% and 0.4% doses of Bordeaux mixture and phosphites, respectively. No differences were verified for productivity. The dosis of 0.4% of Bordeaux mixture and 0.3% of phosphites resulted in control of Downy Mildew of grape.

Palavras-chave : Plasmopara viticola; control; phytotoxicity; production.

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