The Lake Erie Regional Grape Program
Grape Integrated Pest Management Distance Learning
This website was supported in part by grant #NEIPM9902 of the Northeastern Regional IPM Grants Program
GRAPE PEST CALENDAR
Dormant Bud Swell-Bud Break 3- to 6-Inch Shoot Growth 10- to 12-Inch Shoot Growth Immediate Prebloom
Trace Bloom Bloom Postbloom Pea-Size Berries Third Week in July
Early August Third Week in August Preharvest  
Growth Stage Date1 GDD2 GDD Range IPM Practices Implemented Pests Present3
Dormant Nov.-April
  • Set up weather equipment by April 1.
  • Prune to reduce overwintering inoculum for pests listed here.
  • Assign risk category to vineyards using Grape Berry Moth Risk Assessment protocol (GBM RA).
  • Determine weed management programs.
  • Eutypa
  • Phomopsis Cane and Leaf Spot (Phom)
  • Black Rot (BR)
  • Crown Gall
    • Bud Swell -
    Bud Break    		 May 5 109 (69-172)
  • Apply pheromone ties for GBM
    		•
  • Grape Flea Beetle
  • Climbing Cutworm
    • 3- to 6-Inch Shoot Growth
  • Monitor weather for infection periods by BR and PM.
  • Start disease management program for highly susceptible varieties and vineyards with high overwintering PM inoculum.
  • Start postinfection (PI) disease management program for varieties with moderate susceptibility to BR.
    - or -
  • Start primary-season protectant (PSP) disease protocol for vineyards with a history of severy Phom, downy mildew (DM), and/or BR.
  • BR
  • Powdery Mildew (PM)
  • Phom
  • Grape Cane Gallmaker
  • Angular Leaf Scorch
    • 10- to 12-Inch Shoot Growth
  • Monitor weather (as above)
  • Start PI disease management program for Concord vineyards with no history of disease problems.
  • Continue previously started disease managment strategies.
  • Monitor for banded grape bug.
  • BR
  • PM
  • Phom
  • DM
  • Banded Grape Bug
    • Immediate Prebloom
  • Scout for leafhopper (LH) and rose chafer.
  • Monitor weather (as above).
  • Check disease management protocol to determine whether protectant application is needed.
  • DM
  • PM
  • Phom
  • DM
  • Rose Chafer
    • Trace Bloom
  • Monitor weather (as above).
  • Botrytis Bunch Rot (Bot)
  • BR
  • PM
  • Phom
  • DM
    • Bloom June 14 584 (513-616)
  • Begin row-middle management.
  • Switch to protectant phase of PI disease strategy in varieties highly susceptible to DM and/or Bot.
  • Continue PI disease strategy for Concords.
  • Monitor weather (as above).
  • BR
  • PM
  • Phom
  • DM
  • Bot
    • Postbloom
    - or -
    Second Postbloom
  • Apply insecticide in high-risk GBM RA vineyards and vineyards with LH feeding prebloom.
  • Scout vineyards for grape rootworm las week in June.
  • Apply final fungicide for PSP strategy.
  • Continue disease management strategy, if applicable.
  • Remove leaves for Bot management.
  • BR
  • PM
  • Phom
  • DM
  • Bot
  • GBM
  • Grape Rootworm
    • Pea-Size
    Berries
  • Discontinue PI disease program in Concord berries with less than 1% (percent) BR or PM cluster infection.
  • Continue disease management strategy, if applicable.
  • Remove leaves for Bot management.
  • BR
  • PM
  • DM
  • Bot
    • Third Week in July
  • Scout low- and intermediate-risk vineyards for GBM and LH, using GBM RA and LH protocols.
  • Continue disease management stragegy, if applicable.
  • BR
  • PM
  • DM
  • Bot
  • LH
    • Early August
  • Apply insecticide in high-risk GBM RA vineyards and low- and intermediate-risk vineyards that exceeded the 6 percent damage threshold during July scouting for GBM.
  • Continue disease management strategy, if applicable.
  • Determine when berries reach 5° Brix for supplemental
  • Bot management on susceptible cultivars.
  • BR
  • PM
  • DM
  • Bot
  • LH
  • GBM
    • Third Week in August
    (Veraison)
  • Scout high-risk vineyards using GBM RA.
  • Determine when berries reach 8° Brix to ascertain susceptibility of berries to infection by BR and PM.
  • Continue disease management strategy, if applicable.
  • BR
  • PM
  • DM
  • Bot
    • Preharvest
  • Map percent weed cover and species present under and between rows.
  • Evaluate disease and insect management programs.

    • 1Dates represent averages for a Concord vineyard at the Lake Erie Regional Center for Grape Research and Extension, Fredonia, NY. Dates will differ depending on variety.
    2GDD = growing degree days, base 50, accumulations starting April 1. The numbers listed here represent averages for a Concord vineyard at the Lake Erie Regional Center for Grape Research and Extension, Fredonia, NY. Growing degree days will differ depending on variety.
    3Many of the insect pests listed are not found on a regular basis. Monitoring is required, using the techniques listed in appendix 2.