Effect of aqueous extracts of alien weed Parthenium hysterophorus and two native asteraceous species on germination and growth of mungbean, Vigna radiata L. Wilczek.

A study was carried out at the Institute of Mycology and Plant Pathology, University of Punjab, Lahore, Pakistan during 2007 to investigate the phytotoxic effects of an alien weed Parthenium hysterophorus L. in comparison with two native Asteraceous weed species viz. Ageratum conyzoides L. and Sonchus oleraceous L. on mungbean (Vigna radiata L. Wilczek) germination and growth. The highest concentration of Parthenium leaf extract (15% w/v) reduced mungbean germination by 26 percent as compared to 11 and zero percent reduction due to same extract concentration of S. oleraceous and A. conyzoides, respectively. Shoot length of mungbean seedlings was reduced by 17–52 percent and 23–52 percent, and shoot biomass by 26-36 percent and 2.4–58 percent due to various extract concentrations of parthenium and A. conyzoides, respectively. Shoot length was stimulated by extract of S. oleraceous. In general, extracts of all three test weed species stimulated the root growth of mungbean. The results conclude that aqueous extracts of alien weed Parthenium exhibited more phytotoxic effects on germination of mungbean as did by two test native weed species belonging to same family.

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