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Purple Nutsedge Control and Cucumber Tolerance to Sandea (Halosulfuron).

Purple Nutsedge Control and Cucumber Tolerance to Sandea (Halosulfuron). Ginger K. Perdue Long County Cooperative Extension Service A. Stanley Culpepper Extension Agronomist – Weed Science. Purple Nutsedge Competition. Trial Information. Daytona Cucumbers planted Aug 25, 2001.

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Purple Nutsedge Control and Cucumber Tolerance to Sandea (Halosulfuron).

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  1. Purple Nutsedge Control and Cucumber Tolerance to Sandea (Halosulfuron). Ginger K. Perdue Long County Cooperative Extension Service A. Stanley Culpepper Extension Agronomist – Weed Science

  2. Purple Nutsedge Competition

  3. Trial Information • Daytona Cucumbers planted Aug 25, 2001. • 38” rows, 12” spacing. • Harrowed, ripped, bedded. • Plant bed prepared with Telone and ethylfluralin. • Trial used a randomized complete block experimental design, replicated 4 times. • Plots were two rows by 25 feet in length.

  4. Cucumber injury symptoms from Sandea applied POST.

  5. 50 45 40 35 30 plants/plot 25 # fruit lb/plot 20 15 10 5 0 0.5 oz 0.75 oz 1.0 oz Pre-emergence Applications • Application on Aug. 26, 2001. Soil moisture –fair. • 11 days after app. – control of purple nutsedge 51-80%. • By late-season, control dropped to 36-61%.

  6. 50 45 40 35 30 plants/plot 25 # fruit 20 lb/plot 15 10 5 0 0.5 oz 0.75 oz 1.0 oz Post-emergence 2 WAE • Application on Sept. 7, 2001. Soil moisture – moist. • Control of purple nutsedge 75 – 83% at 14 DAT. • Late Season control held to 82 – 93%.

  7. 50 45 40 35 30 plants/plot 25 # fruit 20 lb/plot 15 10 5 0 0.5 oz 0.75 oz 1.0 oz Post-emergence 4 WAE • Application on Sept. 21, 2001. Soil moisture – dry. • Control of purple nutsedge 12-16% at 9 DAT. • Late season control rose to 43-53%.

  8. 50 45 40 35 30 plants/plot 25 # fruit 20 lb/plot 15 10 5 0 0.5 oz 0.5 oz none Split Applications PRE/2WAE 2 & 4 WAE • Split applications were very effective in controlling purple nutsedge at 88% by late season.

  9. Conclusions • Applications of Sandea are most effective prior to 4 weeks after emergence.

  10. Conclusions • Applications of Sandea are most effective prior to 4 weeks after emergence. • Early season weed competition reduced yield for late application treatments.

  11. Conclusions • Applications of Sandea are most effective prior to 4 weeks after emergence. • Early season weed competition reduced yield for late application treatments. • Greatest consistency of all measured variables seen with split applications of Sandea.

  12. Conclusions • Applications of Sandea are most effective prior to 4 weeks after emergence. • Early season weed competition reduced yield for late application treatments. • Greatest consistency of all measured variables seen with split applications of Sandea. • Premier program may be 0.5 oz PRE, followed by 0.5 oz at 3 weeks after emergence.

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