PHENOLOGICAL STAGES: Late flowering: 80% of caps fallen
Edith Byrne, Association Program Educator I
Lake Erie Regional Grape Program
January 7, 2013
What to be doing (Late flowering: 80% of caps fallen):
Trace Bloom:
- Scout for pests (Watch Scouting Video)
- Continue disease managment protocols
- MONITORING REQUIRED: weather parameters of temperature, precipitation and leaf wetness
- Prepare for bloom --- BLOOM
- Petiole testing - submit ASAP for recommendations on N needs for soil applications
Watch Petiole Gathering Video
- Roots - add nitrogen to the soil by mid-June; preferably 2 weeks prior to bloom (up to 25 lbs actual N) and 2 weeks post bloom (up to 25 lbs actual N)
- INOCULUM AVAILABLE FOR INFECTION
Leaves and fruiting zone - scout and spray for:
Powdery Mildew
Downy Mildew
Phomopsis
Black Rot
Botrytis bunch rot
- Row-middle management; Continue disease management protocols
- Botrytis spray if average temperature is <60F and there is abundant rainfall
- MONITORING REQUIRED: weather parameters of temperature, precipitation and leaf wetness
- INOCULUM AVAILABLE FOR INFECTION
Powdery Mildew
Downy Mildew
Phomopsis
Botrytis bunch rot
Black Rot
- Grape Berry Moth Risk Assessment protocol (Bulletin 138. Risk Assessment of Grape Berry Moth and Guidelines for Management of the Eastern Grape Leafhopper)
- MONITORING REQUIRED: weather parameters of temperature, precipitation and leaf wetness;
grape rootworm - INOCULUM AVAILABLE FOR INFECTION
Powdery Mildew
Downy Mildew
Phomopsis
Botrytis bunch rot
Black Rot
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