CHARACTERIZING THE SYNERGISTIC EFFECT OF SULFUR AND SYSTEMIC FUNGICIDES FOR LATE LEAF SPOT MANAGEMENT**
One of the most economically important and damaging diseases that affects the peanut (Arachis hypogaea L.) in the southeastern U.S. is late leaf spot (Nothopassalora personata (Berk. & M.A. Curtis) U. Braun, C. Nakash., Videira & Crous). Research has shown that the addition of sulfur to demethylation inhibitor (DMI) fungicides can increase their effectiveness against the pathogen, sometimes synergistically. Synergism occurs when two substances have a greater effect together than the effects of both individually summed together. A field study was conducted to better understand the synergistic effect and to see if the same effect occurs with other classes of fungicides, such as succinate dehydrogenase inhibitors (SDHI) and quinone outside inhibitors (QoI). Fourteen treatment regimens made up of three different classes of fungicides (DMI, QoI, and SDHI) and sulfur were tested in a randomized-block design field trial where disease incidence and severity were evaluated on five marked leaves per plot. Plots were monitored every two weeks between 65 and 116 days after planting (dap) and then every week between 116 to 141 dap. Disease severity was also monitored using the Florida 1-10 scale system. The results of this experiment will be presented.
VSU Dept. of Biology, Dr. Emily G. Cantonwine, Dr. Albert K. Culbreath, Dr. Timothy B. Brenneman
Harvin, Andrew S.
"CHARACTERIZING THE SYNERGISTIC EFFECT OF SULFUR AND SYSTEMIC FUNGICIDES FOR LATE LEAF SPOT MANAGEMENT**,"
Georgia Journal of Science, Vol. 78, No. 1, Article 38.
Available at: https://digitalcommons.gaacademy.org/gjs/vol78/iss1/38