THE EFFECTIVENESS OF MIXTURES OF ELEMENTAL SULFUR WITH DEMETHYLATION INHIBITORS (DMI) AND QUINONE OUTSIDE INHIBITORS (QOI) ON THE MANAGEMENT OF RUST (PUCCINIA ARACHIDIS) OF PEANUT
The most common way to manage foliar diseases of peanut (Arachis hypogaea) in Georgia is by a pattern of protectant and/or synthetic fungicide applications. Within the last decade, these protectants and synthetic fungicides have in some cases become less effective in control of early leaf spot caused by the fungus Passalora arachidicola and late leaf spot caused by the fungus Nothopassalora personta in peanut. Studies have shown that mixing synthetic fungicides with elemental sulfur has greater control over the severity of late leaf spot in peanut, brown rot in peach caused by the fungus Monilinia fructicola, and powdery mildew in nectarines caused by the fungus Sphaerotheca pannosa. Could these mixtures be used to control the severity of other fungi, like rust in peanut caused by Puccinia arachidis? The purpose of this study was to determine the effectiveness of mixtures of elemental sulfur with demethylation inhibitors (DMI) and quinone outside inhibitors (QoI) on the management of rust of peanut. A field study was conducted in Tifton, Ga in 2020 with four replications of the following treatments: 1) nontreated control, 2) elemental sulfur, 3) DMI fungicide alone, 4) elemental sulfur mixed with a DMI fungicide, 5) QoI fungicide alone, and 6) elemental sulfur mixed with a QoI fungicide. Rust incidence was assessed between August 28th and October 16th on leaves of 10 lateral or central branches collected from each plot weekly. A 9-point scale rating system was used for rust severity. The QoI performed better than the DMI alone. Adding sulfur to each did not reduce disease incidence or severity. Unlike studies with other fungal pathogens, these results suggest that the addition of elemental sulfur to synthetic fungicide is likely not effective for rust management in peanut.
"THE EFFECTIVENESS OF MIXTURES OF ELEMENTAL SULFUR WITH DEMETHYLATION INHIBITORS (DMI) AND QUINONE OUTSIDE INHIBITORS (QOI) ON THE MANAGEMENT OF RUST (PUCCINIA ARACHIDIS) OF PEANUT,"
Georgia Journal of Science, Vol. 79, No. 1, Article 54.
Available at: https://digitalcommons.gaacademy.org/gjs/vol79/iss1/54