Responses of root-knot nematode densities to aqueous extracts of chilli and tamboti

Abstract

Globally, more than 40 % of crop losses can be attributed to pest damage (Pedigo, 1996). Yield losses due to plant-parasitic nematodes range from 8- 20 % in various crops (Table 1.1). However, in developing countries the loss may be as high as 25 to 50 %. The losses due to the root-knot nematode (Meloidogyne species) are heavy, and amount to millions of dollars worldwide. In practice, this implies that many people who go hungry, especially in developing countries, would have been fed if this plant pest had been controlled (Lucas, Campbell and Lucas, 1985).