Slide Presentation

TITLE    (click title to view slides)
Squash Tolerance to Sandea and Applying Sandea Through Drip Tape

AUTHOR
Dr. Theodore M. Webster
Weed Scientist
USDA-ARS
Tifton, GA

DOWNLOAD
• Slide Presentation (PowerPoint, 900 KB)

TABLE OF CONTENTS
  1. Squash Tolerance to Sandea and Applying Sandea Through Drip Tape
  2. Purple and Yellow Nutsedges: Primary Weeds in a Plasticulture System
  3. What Did We Want to Find Out?
  4. Greenhouse Study
  5. Visual Squash Injury (32 DAP)
  6. Sandea Applied PRE to Direct-Seeded Zucchini Squash
  7. Visual Squash Injury (32 DAP)
  8. Drip Tape Injection System
  9. Treatments
  10. Field Study: Crop and Weed Responses
  11. Comparisons
  12. Field Study: Total Crop Yields
  13. Crop Injury Rating Results
  14. Squash Plant Biomass Results
  15. Squash Plant Biomass Results
  16. Conclusions
  17. Conclusions
  18. What’s next? Future research questions
  19. Acknowledgements



SLIDE CONTENTS
  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. Greenhouse Study 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
  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. 60 Lb. Pressure Valve Air Relief Valve Backflow Valve Low Pressure Drain Filter Pressure Regulator (20 lb) DRIP TAPE INJECTION SYSTEM Tifton, GA Pump (125 ml/min) Field Studies
  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. Bare Ground Nontreated
  12. Field Study: Total Crop Yields (lbs/plot)
  13. Culpepper 2001
  14. Culpepper 2001
  15. PRE 20 DAE 30 DAE 10 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.