Resumo

HERNANDEZ-CASTILLO, FD et al. Biological efficiency of organic. biological and chemical products against Alternaria dauci Kühn and its effects on carrot crop. Phyton (B. Aires) [online]. 2006, vol.75, pp.91-101. ISSN 1851-5657.

The biological efficiency of five stocks of Bacillus subtilis, of the mixture of the bioproducts quitosan and Larrea tridentata extract, and five synthetic fungicides were evaluated against the fungus Alternaria dauci Kühn in laboratory and greenhouse experiments. The effect of these compounds on growth and yield of carrot was also determined. Stocks of the bacteria Bacillus (B3, B9, B15 and a combination of these) and the mixture quitosan- Larrea stimulated carrot development because it reached greater width, length and weight in comparison to the control and the other treatments. Stock B3 was the best in promoting carrot growth because it showed the greatest root diameter, length and fresh weight at harvesting time. However, it behaved statistically similar to the other stocks of Bacillus. Considering the encouraging results obtained with the studied bioproducts, it is convenient to analyze its potential against other fungi in vitro and in vivo and on other plant crops.

Palavras-chave : Bacillus subtilis; Biocontrol; Quitosan; Daucus carota; Larrea tridentata.

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