Invasive weeds a threat to the biodiversity: A case study from Abbottabad district [North-West] Pakistan
2002
Hashim, S. | Marwat, K.B. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Weed Science)
A survey was conducted using a sample of 200 farmers from 16 villages of Abbotabad district, during August 2001 to March 2002 regarding weeds. A total of 36 weeds were reported as problem weeds, and out of that, only 16 weeds reported as invasive. These were Xanthium strumarium, Ipomoea eriocarpa, Alternanthera pungens, Trianthema portulacastrum, Tagetes minuta, Imperata cylindrica, Amaranthus hybridus, Robinia pseudoacacia, Broussonetia papyrifera, Ailanthus altissima, Pistia stratiotes, Phragmites australis, Parthenium hysterophorus, Cannabis sativa, Galium aparine and Emex spinosus. Among these invasive plants, Robinia pseudoacacia, Broussonetia papyrifera and Ailanthus altissima, were purposely introduced and all three are trees and they later on became invasive or at least aggressive by replacing or suppressing the local vegetation. Their distribution, history of invasion and management has been discussed in this manuscript.
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