Management of root knot nematodes in turfgrass using mustard formulations and biostimulants.

The control of nematodes in turfgrass poses particular problems for turf managers. Due to the nature of this specialized "crop" system, many of the options available in agriculture and horticulture are impractical and the range of available chemical controls limited. This is particularly highlighted by the withdrawal of fenamiphos, one of the most widely used nematicides in the turfgrass industry. Mustard products are known to release allyl isothiocyanate, a potent nematicide. Laboratory based trials have shown mustard formulations can release enough of this chemical to significantly reduce numbers of root knot nematodes in pot trials using sand based soils. During 2005, trialling at a number of golf courses assessed the efficacy of mustard as a practical alternative to fenamiphos. During heavy nematode infestations, turf grass is exposed to high levels of stress resulting from direct nematode feeding damage as well as the usual environmental stresses imposed by low cutting and heavy wear and tear during play. Stress relief using biostimulants has proven useful in helping maintaining turf cover in these situations and can be applied as part of the normal turf management programme.