Biological control of Parthenium iv: Suppressive ability of aqueous leaf extracts of some allelopathic trees against germination and early seedling growth of Parthenium hysterophorus L.
2005
Shafique, S. (Punjab Univ., Lahore (Pakistan). Dept. of Mycology and Plant Pathology) | Bajwa, R. (Punjab Univ., Lahore (Pakistan). Dept. of Mycology and Plant Pathology) | Javaid, A. | Shafique, S.
Aqueous extract bioassays were conducted to evaluate the allelopathic potential of five-tree species viz. Azadirachta indica (L.) A. Juss. Ficus benghalensis L., Melia azadarach L., Mangifera indica L. and Syzygium cumini (L.) Skeels., for their use in Parthenium hysterophorus L. control, one of the world's worst weeds. Aqueous extracts of 2, 4, 6, 8 and 10% (w/v), obtained from dry leaves of test tree species were bio-assayed on P. hysterophorus seeds. Toxicity of the aqueous extracts was assessed by recording their effect on germination, radicle and plumule length, and seedling biomass of the test weed species. Aqueous extracts of 8 and 10% concentrations of the entire test tree species invariably and significantly (P less than or equal to 0.05) suppressed germination of P. hysterophorus seeds. Extracts of F. benghalensis and M. indica were proved more inhibitory than rest of the test species, where extract of lowest concentration of 2% significantly suppressed the germination. Extracts of M. azadarach were found most effective in suppressing the radicle and plumule growth of P. hysterophorus followed by S. cumini and F. benghalensis.
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