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Demonstration and Evaluation of Integrated Crop Scouting on Pumpkins in Southern NJ

Demonstration and Evaluation of Integrated Crop Scouting on Pumpkins in Southern NJ. Sally Walker Rutgers Cooperative Extension Vegetable IPM Program. Investigators. Joe Ingerson-Mahar Vegetable IPM Coordinator Kris Holmstrom IPM Program Associate

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Demonstration and Evaluation of Integrated Crop Scouting on Pumpkins in Southern NJ

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  1. Demonstration and Evaluation of Integrated Crop Scouting on Pumpkins in Southern NJ Sally Walker Rutgers Cooperative Extension Vegetable IPM Program

  2. Investigators Joe Ingerson-MaharVegetable IPM Coordinator Kris HolmstromIPM Program Associate Michelle Infante-Casella Gloucester CountyAg Agent Ray SamulisBurlington CountyAg Agent Bill SciarappaMonmouth CountyAg Agent Steve JohnstonSpecialist in Vegetable Pathology Frank SpiekerGarden State Pest Management

  3. Objectives • On-farm demonstration • Evaluate jack-o-lantern pumpkins (powdery mildew susceptible and resistant varieties) • Test and compare the North Jersey IPM scouting protocol vs. grower’s usual practices

  4. IPM - pest management based on field scouting information Control - grower follows normal practices Methods 5 farms, 6 comparison blocks/fields (Cumberland, 2-Gloucester, Burlington, Monmouth) Evaluate yields and field pest levels

  5. 1.5 acres Control IPM 0.4 acres 2.3 acres 1.8 acres 0.5 acres 2.5 acres Field Layout

  6. 4.8 acres 4.5 acres Control IPM 2.9 acres 1.8 acres 1.8 acres 2.0 acres

  7. Methods • Scout twice a week from emergence to start of fungicide schedule • 2 leaves, 5 plants, 10 locations • Insects, mites • Foliar and fruit diseases • Weeds, other problems noted

  8. Scouting Form

  9. Cucumber Beetles Threshold: >2 per 6 sites

  10. Spider Mites Squash Bug Aphids Threshold: >20 leaves w/colony Threshold: increasing # leaves infested Threshold: 1 nymph group/plant

  11. Powdery Mildew Threshold: 1 lesion/50 mature leaves

  12. Phytophthora Threshold: Presence of disease

  13. Threshold: Presence of disease or Disease forecasted for our region (Cucurbit Downy Mildew Forecast) Downy Mildew

  14. Bacterial Spot Threshold: Presence of disease

  15. Virus Watermelon mosaic virus 2 Potyvirus

  16. Protocol for IPM fields • Admire at planting or scout for cuke beetles and treat as needed • Initiate fungicide treatments at powdery mildew threshold (1 lesion/50 mature leaves) • Bravo+Nova alt. Quadris 7-10 day schedule • Modify schedule based on scouting results • Add insecticide if needed • Modify fungicide if needed

  17. Marketable Yield

  18. Average Fruit Weight

  19. Results

  20. Fungicide Reduction

  21. Insecticide Reduction

  22. Bottom Line Scouting costs: $25 per acre Pesticide Costs: Potential Savings: Fungicides: 1-2 applications each: $17 - Bravo OR = $17-$34 $27 - Bravo+Nova = $27-$54 $31 - Quadris = $31-$62 Insecticides/Miticides: 2 applications: $7-10/acre/appl. = $14-$20

  23. Conclusions • Disease scouting worked well for timing and choice of fungicide • Potential for pesticide reduction and cost savings: • 1-4 fungicide applications • 2+ insecticide applications • Overall grower response has been positive

  24. Plant & Pest AdvisoryVegetable Crops Edition • Stay informed of insect and disease advisories • Reduce costs through IPM and more effective use of pesticides • New info each week • Available by mail or fax subscription Visit the Vegetable IPM Program booth for subscription forms

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