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Squash Tolerance to Sandea and Applying Sandea Through Drip Tape

Squash Tolerance to Sandea and Applying Sandea Through Drip Tape. Dr. Ted Webster Weed Scientist USDA-ARS Tifton, GA. Purple and Yellow Nutsedges: Primary Weeds in a Plasticulture System. What Did We Want to Find Out?. Will Sandea injure squash? Does application method matter?

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Squash Tolerance to Sandea and Applying Sandea Through Drip Tape

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  1. Squash Tolerance to Sandea and Applying Sandea Through Drip Tape Dr. Ted Webster Weed Scientist USDA-ARS Tifton, GA

  2. Purple and Yellow Nutsedges: Primary Weeds in a Plasticulture System

  3. What Did We Want to Find Out? • Will Sandea injure squash? • Does application method matter? • What kind of nutsedge control can we expect?

  4. Squash cultivars: 3 zucchini 2 yellow crookneck 1 yellow straightneck Rates of Sandea: 0.33 oz/A 0.66 oz/A 1.00 oz/A Application Methods: PRE POST Split Planting Methods: Transplants Direct Seeded Greenhouse Study

  5. Visual Squash Injury (32 DAP) * * 32 DA-PRE, 16 DA-POST

  6. Sandea Applied PRE to Direct-Seeded Zucchini Squash (Tigress) 0.33 oz/A 1.0 oz/A Nontreated Control

  7. Visual Squash Injury (32 DAP) * * * *

  8. Field Studies Pump (125 ml/min) 60 Lb. Pressure Valve Air Relief Valve Pressure Regulator (20 lb) Backflow Valve Filter Low Pressure Drain DRIP TAPE INJECTION SYSTEM Tifton, GA

  9. Treatments (Applied 14 days prior to transplanting/seeding) • Metam (75 gal/A) • Non-treated: Black Plastic mulch • Non-treated: Bareground • Sandea (PRE) – prior to laying plastic • Sandea (Drip) – applied through Drip Tape • 0.75 oz/A in 1 gal. of water, injected for 30 min. • Flush system for 1 hour Webster 2000 & 2001

  10. Field Study: Crop and Weed Responses

  11. Metam Sandea PRE Bare Ground Nontreated Sandea: Drip Nontreated

  12. Field Study: Total Crop Yields (lbs/plot)

  13. Culpepper 2001

  14. Culpepper 2001

  15. PRE 10 DAE 20 DAE 30 DAE

  16. Conclusions • Sandea caused early season squash injury. • Variable response of squash to Sandea: • Greenhouse: Early growth of transplanted squash more tolerant of Sandea than direct-seeded squash. • Field: Differences among planting methods in response to Sandea were not detected in terms of crop yield. • Field: Older/larger plants appear to be more tolerant of Sandea applications.

  17. Conclusions • Preliminary: similar nutsedge suppression from: Metam (75 gal/A) and Sandea (0.75 oz/A); Is tuber population affected? • Early season: 80% fewer nutsedge shoots in black plastic UTC vs. bareground UTC

  18. What’s next?Future research questions • Will Sandea through drip tape kill emerged nutsedge ? • Will cucurbits tolerate POST Sandea applications through drip tape? • How many purple nutsedge does it take to reduce squash yields?

  19. Acknowledgements • We acknowledge the technical skills and efforts of James Davis in coordinating these studies. • We also thank Eddie Sklany and the numerous student workers for their assistance in plot establishment and harvest. • This work was supported in part by the IR-4 Minor-Use Crops Research Project.

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