Submitted to: European Society of Nematologists
Publication Type: Abstract Only
Publication Acceptance Date: September 19, 2010
Publication Date: September 24, 2010
Citation: Timper, P., Davis, R.F., Jagdale, G. 2010. Impact of a nematicide on biological suppression of plant-parasitic nematodes [abstract]. 30th International Symposium of the European Society of Nematologists. pg. 84. Technical Abstract: Application of the fumigant nematicide 1,3-D (Telone) could lead to pest resurgence if populations of predatory nematodes are slower to recover than populations of plant-parasitic nematodes. We sampled soil from control and 1,3-D-treated plots in a replicated field study to determine the effect of the nematicide on abundance of predatory nematodes. The soil was collected from the planting furrow before fumigation, after planting cotton (3 wks post fumigation), and at mid season. Two bioassays were also conducted with soil collected from control and 1,3-D plots: one to determine survival of vermiform reniform nematode (RN, Rotylenchulus reniformis) at the three sampling times, and the other to determine the reproductive potential of Meloidogyne arenaria post plant. Numbers of predatory nematodes were substantially reduced by 1,3-D post plant and mid season. Compared to the control, survival of RN in soil from the 1,3-D plots was lower pre-fumigation, but was greater post plant. There was also a negative correlation between abundance of predators and % survival of RN post plant. By mid season, there was no difference between control and 1,3-D plots in survival of RN. Reproduction of M. arenaria was also lower in the control compared to the 1,3-D soil. In this study, 1,3-D reduced biological suppression (in part due to predatory nematodes) for only a brief period of time.