2016 Fumigant Systems Stanley Culpepper, University of Georgia - - PowerPoint PPT Presentation

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2016 Fumigant Systems Stanley Culpepper, University of Georgia - - PowerPoint PPT Presentation

Oct 16, 2023 346 likes •667 views

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

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2016 Fumigant Systems

Stanley Culpepper, University of Georgia Tifton Campus

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Focus Points

  • 1. Trifecta gone; 5 systems exist.
  • 2. December fumigation for spring crop.
  • 3. Keeping the fumigant in the bed.
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Fumigant Systems For Weeds

  • 1. Paladin Pic + Vapam TIF
  • 2. UGA 3-WAY* TIF
  • 4. UGA 3-WAY LDPE
  • 5. Pic Chlor 60 TIF
  • 3. Paladin Pic TIF

All common weeds Good nutsedge, watch grass and pigweed Watch nutsedge, good grass and pigweed Watch nutsedge, grass, and pigweed… ...nematodes?? *UGA 3-WAY: system of Telone II, Pic, Metam

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Telone II Application 12 to 16 “ deep

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Paladin Pic or Chloropicrin placed 8 inches deep Pic Chlor 60 = 8-10 in. (21 G)

Low Nematode Levels

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Metam Application with blades 4” apart applying metam 4” deep – no herbicide under mulch

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Paladin Pic + Vapam TIF Check

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3-WAY; TIF Check

UGA 3-WAY. Fall 2013. Tift Co.

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Nutsedge response to the 3-WAY. Tift Co., 2013.

20 40 60 80 100

Plots were 1 bed by 150 feet. Fall soil temp 84. (Veg 43-13)

LDPE TIF 89 b 99 a %

160 plant/A 494 plant/A

82,460 plant/A check

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Nutsedge response to the 3-WAY. Echols Co., 2013.

20 40 60 80 100

Plots were 1 bed by 150 feet. Spring soil temp 64. (Veg 13-13)

LDPE TIF 65 c 97 a %

290 plant/A 37,265 plant/A

319,250 plant/A check

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Fumigant (PPM) Levels In Bed

Fumigant/ Much 4 weeks 2015 2016 UGA -LDPE 25 37 UGA-TIF 290 345

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How Intense is the Population?

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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

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Nutsedge plants/A as impacted by fumigation time of year. Tifton, 2015.

Plots 1 bed by 90 feet. (Veg 2-15). Non-treated control 203,280 plant/A. LSD 5420

UGA 3-WAY LDPE 32224 3581 Dec 11 Feb 5

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Nutsedge plants/A as impacted by fumigation time of year. Tifton, 2015.

Plots 1 bed by 90 feet. (Veg 2-15). Non-treated control 203,280 plant/A. LSD 5420

UGA 3-WAY LDPE UGA 3-WAY TIF Trifecta + Vapam TIF 32224 3581 484 1451 3872 7018 Dec 11 Feb 5

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Fumigant (PPM) Levels In Bed

Fumigant/ Much 4 weeks Dec 11 Feb 5 UGA -LDPE 25 UGA-TIF 290 6 Trifecta + Vapam- TIF 1465 88

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Fumigant (PPM) Levels In Bed

Fumigant/ Much 4 weeks 8 weeks Dec 11 Feb 5 Dec 11 Feb 5 UGA -LDPE 25 UGA-TIF 290 6 14 Trifecta + Vapam- TIF 1465 88 88

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Spring PlantBack?

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Cover Crop Should Establish More Rapidly with Dec Fumigation

2 weeks 3 weeks

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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.

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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!!

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Single Drip Metam Application – 3 WAT.

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Spring Drip Double Drip

6000 7400 15000 15000 15000 15000

Fumigant (PPM) Levels In Bed: 5 Days

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http://www.epa.gov/pesticides/reregistration/soil_fumigants/

REGULATORY CHALLENGES

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Paladin Pic Systems

Light Populations: 40 GPA TIF Moderate to Severe: 50 GPA TIF

BE CAREFUL FOR ODOR MANAGEMENT MUST USE TIF MULCH

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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

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ROTATE DISKING WITH ROUNDUP AND 1 QT 3WK AFTER NUTSEDGE EMERGENCE

ADD SANDEA IN WITH ROUNDUP ONCE IF NOT CARRYOVER PROBLEMS

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Questions or Comments?

Continued Thanks: William UpChurch and Perry Fuller