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Ciência e Agrotecnologia

versão impressa ISSN 1413-7054versão On-line ISSN 1981-1829

Resumo

FERREIRA, Magda Cristiani; SOUZA, José Roberto Pinto de  e  FARIA, Terezinha de Jesus. Allelopathy of plant extracts on germination and initial growth of beggartick (Bidens pilosa L.) and lettuce (Lactuca sativa L.). Ciênc. agrotec. [online]. 2007, vol.31, n.4, pp.1054-1060. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542007000400017.

Bidens pilosa L. is an aggressive weed found all over Brazil. The main control method for this species is chemical treatment however, causes strong environmental impact, and it has great human contamination risks, and may cause phytotoxity to crops. The objective of this study was to evaluate the effect of ethanolic extracts of Eucalyptus citriodora Hook. and Pinus elliottii L. on seed germination and initial growth of B. pilosa and lettuce (Lactuca sativa L.). Five concentrations of each extract (0.0; 0.25; 0.50; 1.0; 2.0%) were tested in laboratory conditions using a randomized complete block design with four replicates. P. elliottii extract had no effect on B. pilosa and lettuce. However, E. citriodora extract, significantly reduced germination index (GI) of B. pilosa, in all tested concentrations, when compared with the control composed by distilled water. Lettuce GI was affected only by 2,0% concentration of ethanolic extract. Extracts of both P. elliottii and E. citriodora had no significant effect on the root length parameter of both B. pilosa and lettuce.

Palavras-chave : Eucalyptus citriodora; Pinus elliottii; Bidens pilosa; Lactuca sativa.

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