Tuesday, April 17, 2012

Homeowner Grape Spray Schedule - Low Impact

Home gardeners who are overwhelmed by spray schedules may be interested in this quick publication. Note, this is a low-impact schedule, so high disease pressure will warrant revision. Contact your UK county Extension agent or refer to other UK publications for more detailed information http://www.ca.uky.edu/agc/pubs/id/id21/id21.pdf and http://www.ca.uky.edu/agcollege/plantpathology/ext_files/PPFShtml/PPFS-MISC-7.pdf



Sample Simplified Home Grape Low-Spray Schedule

Dr. John Strang, Dr. Patsy Wilson, Dr. Nicole Ward & Dr. Ric Bessin University of Kentucky Extension Horticulture, Viticulture, Plant Pathology, and Entomology Specialists respectively

2012


Recommendations based on ID-21. For organic options refer to ID-21. This schedule should provide reasonable control in most seasons, but is not a complete schedule to control every pest problem.  It uses a minimal number of products.

Black Rot of Grape (Clemson)


Dormant

Ø Sulforix – Anthracnose

Bud Swell

Ø Sevin – only if flea beetles are noted eating holes in the buds

New Growth (2-4” long)

Ø Mancozeb* + myclobutanil - for black rot, Phomopsis cane and leaf spot, powdery mildew & downy mildew

Ø Myclobutanil (Immunox) is systemic and won’t wash off.

New Growth (10-15” long or 7-10 days after last spray)

Ø Mancozeb + myclobutanil for black rot, Phomopsis cane and leaf spot, powdery mildew and downy mildew

Pre- bloom (Just before blooms open)

Ø Mancozeb + myclobutanil - for black rot, Phomopsis cane and leaf spot, powdery mildew & downy mildew

Bloom

Ø Mancozeb + myclobutanil - for black rot, powdery mildew & downy mildew

Post Bloom

Ø Captan + myclobutanil - for black rot, powdery mildew & downy mildew

Ø Sevin – grape berry moth control

Ø Mix all of these in the same spray tank

First, Second third and forth cover sprays (every 10 to 14 days**)

Ø Captan + myclobutanil - for black rot, powdery mildew & downy mildew

Ø Sevin – Spray for Japanese beetles only when they are present.

Ø Check label for PHI and abide by this




*May substitute Captan for Mancozeb throughout this spray schedule

**Spray schedule frequency should be shortened in rainy weather and extended in dry weather.  Early season sprays are very important because this is a protectant spray program.

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