Allelopathy Journal

The control of P. hysterophorus using crude preparations of I. cylindrica, an allelopathic grass, was evaluated. An ecological survey in Pakistan revealed that the frequency and density of P. hysterophorus were significantly lower in I. cylindrica-dominated localities than in nearby areas without I. cylindrica. The aqueous extracts of I. cylindrica inhibited P. hysterophorus germination and seedling growth. The aqueous root and shoot extracts at 5, 10, 15, 20 and 25% (w/v) were evaluated for their effects on P. hysterophorus germination and seedling growth. The root and shoot aqueous extracts significantly suppressed the germination of P. hysterophorus. Early seedling growth of P. hysterophorus was generally reduced by the extracts at concentrations of >=10%. Increasing the concentration of the extract increased its inhibitory potential. The shoot extract was more inhibitory than the root extract.