Abstract
The effects of excised root tips of some plants on larvae of the root-knot nematode, Meloidogyne incognita acrita, were investigated with the watch glass containing 0.5% water agar. It was found that every root tip of tested plants had a repellent effect on the nematode. The repellent effect had continued from one to three hours and then disappeared except tobacco root. The repellent substance seemed to be released from the cut surface of the root.
