Effect of long term aldicarb applications on the development of field populations of some endoparasitic nematodes

Globodera rostochiensis, Meloidogyne naasi, and Pratylenchus crenatus multiplying on potato, wheat, and maize, respectively, were annually exposed for 15 consecutive years to aldicarb (0, 0.3, or 0.6 g/m(2)). In the sixteenth year, all of the previously exposed and unexposed populations were treated (0, 0.3, or 0.6 g/m(2)) with the same nematicide. The development of nematodes inside the host roots was used to assess the nematode response to the final treatment. This response varied with the nematicide applications and with the nematode stages considered. Depending on the nematode species and degree of exposure to nematicide, long term annual aldicarb treatments reduced or increased the presence of some nematode stages of the three species. The effects, however, were not constant and not consistent from one stage to another. (C) Elsevier - ORSTOM.