Allelopathy of Ageratum conyzoides L. on Bidens pilosa L., Oryza sativa L. and Cucumis sativus L.
DOI:
https://doi.org/10.15517/bc16e790Keywords:
allelopathic extracts, pre-emergent weed control, plant allelopathy, biological control of weedsAbstract
Introduction. Ageratum conyzoides is considered an invasive species; nevertheless, its allelopathic potential has been identified. Allelopathic extracts offer a potential alternative to conventional weed control. Objective.Determine the allelopathic effect of extracts of A. conyzoides L. on seedling emergence and initial growth of the weed Bidens pilosa L. and the crops Cucumis sativus L. and Oryza sativa L.. Materials and methods. From January to October 2021, in the greenhouse of the Fraijanes Substation, Alajuela, Costa Rica, fresh and dried extracts prepared from A. conyzoides leaves were tested. Each extract was prepared at concentrations of 100 %, 50 %, and 25 % (w/v), and applied to seeds of selected weeds and crops. The number of emerged seedlings, radicle length, shoot and seedling length, as well as biomass of weeds and crops, were determined; a completely randomized design was used. Data were analyzed using analysis of variance and Tukey’s test (for seedling and root length, and biomass) and logistic regression (for emerged seedlings). Results. The allelopathic extracts of A. conyzoides inhibited the emergence of B. pilosa seedlings; the 50% dose was more inhibitory than the 100% dose (odds ratio = 3.12) and resulted in shorter root lengthlength and lower biomass. In O. sativa, the use of both extracts showed no inhibitory effect on germination compared with the control; however, the fresh extract resulted in shorter plant length. Neither extract affected C. sativus. Conclusion. A. conyzoides extract showed inhibitory effects on B. pilosa and O. sativa but did not affect C. sativus.
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