Resumo

SILVA, Cristiane Mendes da; BOTELHO, Renato Vasconcelos; FARIA, Cacilda Marcia Duarte Rios  e  MATEUS, Milena Aparecida Ferrari. Influence of extraction method of chinaberry to control of anthracnose of grapevine. Ciência Téc. Vitiv. [online]. 2013, vol.28, n.1, pp.01-08. ISSN 0254-0223.

The objective of this study was to compare different preparing methods of chinaberry extract (Melia azedarach L.) on mycelial growth and sporulation of Elsinoe ampelina. For in vitro assay it was tested the concentrations of 0, 10, 20, 30, 40 and 50 mL.L^-1 of chinaberry aqueous extract (1:10 w/v) and the standard treatments with bordeaux mixture and mancozeb. From these methodologies, it was chosen the extract by infusion for experiments in field, where it was evaluated their action on the severity of grapevine anthracnose. In this experiment was used the same chinaberry concentrations of in vitro assay added to vegetable oil as adjuvant, besides a absolute control and standard treatment with bordeaux mixture. In the vitro assays, the methodology that presented an effective antimicrobial activity on E. ampelina was the aqueous microfiltered, giving a decrease in colony diameter from 82.2 to 99.4%, and sporulation from 77.6 to 100%, not differing from standard treatments with bordeaux mixture and mancozeb. In field conditions, all concentrations of chinaberry extracted by infusion showed a significant reduction on AACPD, that did not differ from the treatments with bordeaux mixture and vegetable oil. The reduction of AACP grapevine anthracnose ranged from 51 to 56.3%.

Palavras-chave : Vitis labrusca; santa-barbara; plant extracts; agroecology; organic production.

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