2016 Fumigant Systems Stanley Culpepper, University of Georgia Tifton Campus
Focus Points 1. Trifecta gone; 5 systems exist. 2. December fumigation for spring crop. 3. Keeping the fumigant in the bed.
Fumigant Systems For Weeds 1. Paladin Pic + Vapam TIF All common weeds 2. UGA 3-WAY* TIF Good nutsedge, watch 3. Paladin Pic TIF grass and pigweed Watch nutsedge, good 4. UGA 3-WAY LDPE grass and pigweed Watch nutsedge, grass, 5. Pic Chlor 60 TIF and pigweed… ...nematodes?? *UGA 3-WAY: system of Telone II, Pic, Metam
Telone II Application 12 to 16 “ deep
Paladin Pic or Chloropicrin placed 8 inches deep Low Nematode Levels Pic Chlor 60 = 8-10 in. (21 G)
Metam Application with blades 4” apart applying metam 4” deep – no herbicide under mulch
Paladin Pic + Vapam TIF Check
UGA 3-WAY. Fall 2013. Tift Co. 3-WAY; TIF Check
Nutsedge response to the 3-WAY. Tift Co., 2013. 100 99 a 80 89 b 60 % 40 20 494 plant/A 160 plant/A 0 TIF LDPE Plots were 1 bed by 150 feet. Fall soil temp 84. (Veg 43-13) 82,460 plant/A check
Nutsedge response to the 3-WAY. Echols Co., 2013. 100 97 a 80 60 65 c % 40 20 37,265 plant/A 290 plant/A 0 LDPE TIF Plots were 1 bed by 150 feet. Spring soil temp 64. (Veg 13-13) 319,250 plant/A check
Fumigant (PPM) Levels In Bed Fumigant/ 4 weeks Much 2015 2016 UGA -LDPE 25 37 UGA-TIF 290 345
How Intense is the Population?
Factors Influencing Rate/Control = Keeping Fumigant in the Bed 1. 1. Bed formation/compaction 2. Mulch type 3. Moisture 4. Soil Temp 5. Soil Texture INFLUENCE CONCENTRATION OVER TIME
Nutsedge plants/A as impacted by fumigation time of year. Tifton, 2015. Dec 11 Feb 5 32224 3581 0 UGA 3-WAY LDPE Plots 1 bed by 90 feet. (Veg 2-15). Non-treated control 203,280 plant/A. LSD 5420
Nutsedge plants/A as impacted by fumigation time of year. Tifton, 2015. Dec 11 Feb 5 32224 7018 3581 3872 1451 484 0 UGA 3-WAY UGA 3-WAY Trifecta + Vapam LDPE TIF TIF Plots 1 bed by 90 feet. (Veg 2-15). Non-treated control 203,280 plant/A. LSD 5420
Fumigant (PPM) Levels In Bed Fumigant/ 4 weeks Much Dec 11 Feb 5 UGA -LDPE 25 0 UGA-TIF 290 6 Trifecta + Vapam- 1465 88 TIF
Fumigant (PPM) Levels In Bed Fumigant/ 4 weeks 8 weeks Much Dec 11 Feb 5 Dec 11 Feb 5 UGA -LDPE 25 0 0 0 UGA-TIF 290 6 14 0 Trifecta + Vapam- 1465 88 88 0 TIF
Spring PlantBack?
Cover Crop Should Establish More Rapidly with Dec Fumigation 2 weeks 3 weeks
Nematode Impact on Cucumber Fumigant/Much Galling Dec 11 Feb 5 NT 4.0 2.3 UGA – LDPE 0.1 0.1 Trifecta + Vapam - TIF 0.2 0.2 MCW + Pic + Vapam-LDPE 0.1 0.1 Foster, Sanders, Bhabesh. LSD galling = 0.6.
Fall Fumigation 1. Work rotation to treat lower infested fields in fall???? 2. Higher fumigant rates needed? 3. TIF mulch over LDPE? 4. Herbicides……but injury more likely with those under mulch!!
Single Drip Metam Application – 3 WAT.
Fumigant (PPM) Levels In Bed: 5 Days Spring Drip Double Drip 15000 15000 7400 6000 15000 15000
REGULATORY CHALLENGES http://www.epa.gov/pesticides/reregistration/soil_fumigants/
Paladin Pic Systems Light Populations: 40 GPA TIF BE CAREFUL FOR ODOR MANAGEMENT Moderate to Severe: MUST USE TIF MULCH 50 GPA TIF
Managing Nutsedge YEAR ROUND 1. Select the right fumigant system 2. Sandea in crop when feasible 3. Sandea row middles 4. Terminate crops/weeds as soon as crop done
ROTATE DISKING WITH ROUNDUP AND 1 QT 3WK AFTER NUTSEDGE EMERGENCE ADD SANDEA IN WITH ROUNDUP ONCE IF NOT CARRYOVER PROBLEMS
Questions or Comments? Continued Thanks: William UpChurch and Perry Fuller
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