Submitted to: International Conference on Methyl Bromide Alternatives and Emissions Reductions
Publication Type: Proceedings
Publication Acceptance Date: August 15, 2005
Publication Date: October 1, 2005
Citation: Burelle, N.K. 2005. REVIEW OF THE NON-FUMIGANT NEMATICIDES OXAMYL AND FOSTHIAZATE. International Conference on Methyl Bromide Alternatives and Emissions Reductions. 110:1-2. Interpretive Summary: Oxamyl (Vydate®, DuPont Agricultural Products, Wilmington, DE), a carbamate, and fosthiazate (NemathorinTM, Syngenta International AG, Basel Switzerland), an organophosphate, are two non-fumigant nematicides which have been evaluated as partial methyl bromide alternatives since the early 1970’s and 1990’s, respectively. Both compounds function as cholinesterase inhibitors, giving them some insecticidal as well as nematicidal activity. Plant parasitic nematode control with both compounds varies with crop, application method, and targeted nematode pest and their usefulness for soilborne nematode control in vegetable and strawberry production in the Southeastern U.S. may be limited. These products could prove useful in some areas as a supplemental nematode control or where post-plant applications are needed to enhance fumigant performance or where nematode pressure is low.
Technical Abstract: The usefulness of oxamyl and fosthiazate for soilborne nematode control in vegetable and strawberry production in the Southeastern U.S. may be limited. These products could prove useful in some areas as a supplemental nematode control or where post-plant applications are needed to enhance fumigant performance. Also, should a label become available, oxamyl could be useful in field grown ornamentals for control of foliar nematodes, or where risks of phytotoxicity to adjacent plantings restrict use of fumigants such as chloropicrin. However, according to the oxamyl label, the compound should not be used where the water table is close to the surface, where large volumes of water are applied (as irrigation or precipitation), or where there are sandy soils low in organic matter, due to groundwater contamination risks. Fosthiazate is not currently labeled for use in the U.S., although a label for use on tomatoes is expected soon. Although results of fosthiazate trials for nematode control in vegetable production in the Southeastern U.S. are limited, it has been reported to perform fairly well under low nematode pressure. Under high nematode pressure, the efficacy of fosthiazate for parasitic nematode control is reduced. It remains unclear if application methods and rates for use on vegetables will be adequate for root-knot nematode control in Florida. There are also indications that phytotoxicity can be a problem with fosthiazate. More research is needed to determine consistency, efficacy, and phytotoxicity of fosthiazate before it can be recommended as a nematicide component in IPM systems for vegetable and strawberry production in the Southeastern U.S.