The study of the distribution of invasive plants in Bann Pong Conservation Forest,
Sansai District, Chiangmai Province was conducted during March 2017-September 2018. The
objectives of this research were to study plant invasive distribution, species index, and invasion.
Two characteristics of activities, more and less, areas were chosen for sample plots. It was found
that ten species of invasive plants distributed in the area; Mikania cordata (Burm.f.) B.L.Rob.,
Bidens pilosa Linn., Crassocephalum crepidioides, Mimosa diplotricha C. Wright ex Sauvalle,
Chromolaena odorata (Linn.) R.M.King & H.Rob., Ageratina adenophora Sieber ex Steud.,
Penisetum pedicellatum Trin, Imperata cylindrical Linn., Paederia foetida Linn. and
Pennisetum polystachyon (L.) Schult. There were 5 species widely distributed in both sites;
Crassocephalum crepidioides S.Moore, Chromolaena odorata (L.) R.M.King & H.Rob.,
Ageratina adenophora (Spreng.) R.M. King & H. Rob., Pennisetum pedicellatum Trin.) and
Paederia foetida L. The sample areas with high activities, open space, and more light were more
suitable for invasive distribution than the fewer activities areas.