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United States Department of Agriculture

Agricultural Research Service

Title: Efficacy of Dimethyl Disulfide (Dmds) for Control of Nematodes and Fungal Plant Pathogens

Authors
item Rosskopf, Erin
item Church, G. T. - TEXAS A&M UNIV.
item Holzinger, J. - HOLZINGER FLOWERS
item Yandoc-Ables, C. B. - USDA, ARS
item Noling, J. W. - UNIV. OF FLORIDA

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: October 11, 2011
Publication Date: May 1, 2006
Citation: Rosskopf, E.N., Church, G., Holzinger, J., Yandoc-Ables, C., Noling, J. 2006. Efficacy of dimethyl disulfide (dmds) for control of nematodes and fungal plant pathogens. Phytopathology. 96:S100.

Technical Abstract: Dimethyl disulfide (DMDS) is currently under investigation as an alternative to soil fumigation with methyl bromide. DMDS has zero ozone depletion potential and has a complex mode of action that is through mitochondrial malfunction and inhibition of cytochrome oxidase. Two on-farm field trials were conducted to evaluate DMDS for production of ornamental cockscomb (Celosia argentea var. cristata). Treatments included methyl bromide:chloropicrin (98:2 at 448.36 kg/ha), DMDS (784.63 kg/ha), and an untreated check. DMDS provided control of Pythium root rot and nematode (Meloidogyne spp.) control, based on root gall ratings, equivalent to methyl bromide and significantly reduced root knot juveniles in the soil. Marketable yields from this treatment were equivalent to those resulting from the use of methyl bromide. In microplots, control of the tomato wilt pathogen, Fusarium oxysporum f. sp. lycopersici with DMDS treatments was greatest closest to the point of fumigant injection. There was a significant treatment by depth interaction. At the 5 and 15cm depths, DMDS treatments were not significantly different from the untreated check, but inoculum survival was significantly decreased at the 25 cm depth, while depth did not impact methyl bromide or chloropicrin efficacy.

Last Modified: 9/2/2014
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