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Squash Tolerance to Sandea and Applying Sandea Through Drip Tape

This study investigates the effects of Sandea on squash crops, specifically zucchini and yellow varieties, within a plasticulture system. Key questions addressed include Sandea's impact on squash injury, the significance of application methods, and expected nutsedge control. Using varying Sandea rates and application techniques, including pre and post-planting through drip tape, the research found varying degrees of squash tolerance and nutsedge suppression. Preliminary results suggest significant differences based on planting methods and plant maturity levels, paving the way for future inquiries and refinements in weed management strategies.

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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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