Leaf spot fungicides are effective for 14 days, which is also the PHI for most fungicides. No further applications will be needed for growers who plan to dig in the next two weeks. If normal weather patterns return by the middle of the month it will be too cool and dry for further leaf spot activity.
Any leaf spot currently not under good control can (and probably will) explode given the current weather. If you are still 2 weeks or more from harvest once the weather clears, another spray could be justified. If you need to spray, use chlorothalonil (Bravo) alone or mixed with another product. Spraying an unmixed site-specific fungicide (group 3, 7, or 11) when leaf spot populations are high greatly increases the risk of fungicide resistant leaf spot populations.
We will be running disease advisory programs in-house for a few more weeks and can provide updated advisories on request. Please don't hesitate to ask questions about your specific situation.
If you have comments or suggestions about disease advisories, please give me a call or email.
Thanks for your interest in peanut disease advisories. See you next summer!
October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR BUCK Buckland Elementary (Buckland, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 37 LESD = 2015-09-17 BUCK Advisory: do not spray today Growing degree days (base 56) since LESD = 238 Growing degree days (base 56) since May 1 = 2901.2 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR CLIN Horticultural Crops Research Stn (Clinton, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 61 LESD = 2015-09-18 CLIN Advisory: spray today Growing degree days (base 56) since LESD = 242.5 Growing degree days (base 56) since May 1 = 3205.1 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR GOLD Cherry Research Station (Goldsboro, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 55 LESD = 2015-09-18 GOLD Advisory: spray today Growing degree days (base 56) since LESD = 242.7 Growing degree days (base 56) since May 1 = 3155 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR KINS Cunningham Research Station (Kinston, NC) setDate = 2015-09-27 07:00:00 lethal conditions = false favorable hours = 56 LESD = 2015-09-18 KINS Advisory: spray today Growing degree days (base 56) since LESD = 242.6 Growing degree days (base 56) since May 1 = 3195.7 Records count: 120 out of 121 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR LEWS Peanut Belt Research Station (Lewiston, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 76 LESD = 2015-09-18 LEWS Advisory: spray today Growing degree days (base 56) since LESD = 232.3 Growing degree days (base 56) since May 1 = 3163.2 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR PLYM Tidewater Research Station (Plymouth, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 79 LESD = 2015-09-18 PLYM Advisory: spray today Growing degree days (base 56) since LESD = 266 Growing degree days (base 56) since May 1 = 3080.6 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR ROCK Upper Coastal Plain Res Stn (Rocky Mount, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 49 LESD = 2015-09-18 ROCK Advisory: spray today Growing degree days (base 56) since LESD = 226.6 Growing degree days (base 56) since May 1 = 3137.2 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR WHIT Border Belt Tobacco Res Stn (Whiteville, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 52 LESD = 2015-09-18 WHIT Advisory: spray today Growing degree days (base 56) since LESD = 260.6 Growing degree days (base 56) since May 1 = 3236.9 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR WILL Highway Patrol Comm Station (Williamston, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 55 LESD = 2015-09-18 WILL Advisory: spray today Growing degree days (base 56) since LESD = 245.2 Growing degree days (base 56) since May 1 = 3105 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR WILD Williamsdale Field Lab (Wallace, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 63 LESD = 2015-09-18 WILD Advisory: spray today Growing degree days (base 56) since LESD = 261.5 Growing degree days (base 56) since May 1 = 3244.3 Records count: 96 out of 97 Most recent db ob to 8am EDT: 2015-10-02 07:00:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR KSFQ Suffolk Airport (Suffolk, VA) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 48 LESD = 2015-09-18 KSFQ Advisory: spray today Growing degree days (base 56) since LESD = 231.3 Growing degree days (base 56) since May 1 = 2868.8 Records count: 90 out of 97 Most recent db ob to 8am EDT: 2015-10-02 05:55:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR KECG Coast Guard Air Field (Elizabeth City, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 37 LESD = 2015-09-17 KECG Advisory: do not spray today Growing degree days (base 56) since LESD = 273.2 Growing degree days (base 56) since May 1 = 3054.5 Records count: 95 out of 97 Most recent db ob to 8am EDT: 2015-10-02 06:54:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR KDPL Duplin County Airport (Kenansville, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 54 LESD = 2015-09-18 KDPL Advisory: spray today Growing degree days (base 56) since LESD = 241.8 Growing degree days (base 56) since May 1 = 2989.2 Records count: 90 out of 97 Most recent db ob to 8am EDT: 2015-10-02 05:55:00 ------------------- October 2, 2015 PEANUT LEAF SPOT ADVISORY FOR KEYF Brown Field (Elizabethtown, NC) setDate = 2015-09-28 07:00:00 lethal conditions = false favorable hours = 63 LESD = 2015-09-18 KEYF Advisory: spray today Growing degree days (base 56) since LESD = 264.3 Growing degree days (base 56) since May 1 = 3359.9 Records count: 91 out of 97 Most recent db ob to 8am EDT: 2015-10-02 06:55:00 ------------------- These peanut crop disease advisories are being calculated and disseminated in collaboration with the NC State Department of Plant Pathology and with support from the North Carolina Agricultural Research Service.
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