Antinematodal activity of some tropical rainforest plants against the pinewood nematode, Bursaphelenchus xylophilus

Sixty five methanolic extracts of Sumatran rainforest plants representing 6 3 species of 21 families were assayed in vivo for antinematodal activity ag ainst Bursaphelenchus xylophilus using our cotton ball-fungal mat method. E xtracts of 27 plants species from 14 families exhibited antinematodal activ ity, while 37 species were inactive. Among them, three extracts of Bischofi a javanica, Knema hookeriana and Areca catechu exhibited very strong activi ty at minimum effective dose (MED) of 0.7 mg/cotton ball (mg/bl.). Eight ex tracts from Allamanda cathartica, Ervatamia corymbosa, Hoya diversifolia, B ischofia javanica, Derris malacensis, Melastoma melabathricum, Ophiorriza k onsteleary and Brucea sumatrana also showed strong activity (MED, 5 mg/bl.) .