What to be doing (Berries small: bunches begin to hang):
Pea-Size Berries (5mm):

Discontinue postinfection disease managment protocol for Concord
Primary inoculum for black rot and powdery mildew is generally expended at this time. The postinfection disease management strategy can be terminated in Concord vineyards if primary infections of black rot and powdery mildew have been prevented (less than 1 percent cluster infection). If primary infection from either of these diseases is present in the vineyard, a protectant schedule should be followed until veraison (color change).




Continue disease management protocol for Vinifera and varieties susceptible to downy mildew and/or Botrytis.

• The postinfection disease management strategy for Vinifera and French hybrids should be continued to ensure management of powdery mildew, downy mildew, and Botrytis. Berries are susceptible to infection by black rot and powdery mildew from bloom until 8° Brix. Varieties susceptible to powdery mildew and downy mildew can experience premature leaf fall due to severe infections in years conducive to disease development.

Leaf removal for Botrytis bunch rot management

INOCULUM AVAILABLE FOR INFECTION
    Powdery Mildew
    Downy Mildew
    Botrytis bunch rot
    Black Rot

THIRD WEEK IN JULY -
Grape Berry Moth Risk Assessment protocol (Bulletin 138. Risk Assessment of Grape Berry Moth and Guidelines for Management of the Eastern Grape Leafhopper)
Leafhopper scouting; continue disease management protocols if applicable

• Scouting for grape berry moth damage should be accomplished for low- and intermediate-risk vineyards at this time. The sampling procedure for Grape Berry Moth Risk Assessment is to select four sites in each vineyard to be sampled: two on the vineyard edge - a wooded edge if there is one (areas 1 and 2, fig. 2 below) and two in the center of the vineyard (areas 3 and 4, fig. 2 below). Visually inspect, at random, 10 clusters on each of 5 vines (a total of 50) in each of the four areas. One damaged berry counts as a damaged cluster. At each site 50 clusters are examined, for a total of 200 clusters per vineyard.
  
  The damage threshold at this scouting is an average of 6 percent damaged clusters. Both the interior and the edge of the vineyard should be scouted.

EARLY AUGUST -
Grape Berry Moth Risk Assessment protocol (Bulletin 138. Risk Assessment of Grape Berry Moth and Guidelines for Management of the Eastern Grape Leafhopper)

• An insecticide should be applied at this time in vineyards determined to be at high risk for grape berry moth. Vineyards in the low- and intermediate-risk categories over the 6 percent threshold for grape berry moth damage during the third week of July scouting should also receive an insecticide application. Vineyards in the low- and intermediate-risk categories that did not exceed the 6 percent damaged cluster threshold require no treatment at this time.

Time the first Botrytis spray when berries reach 5° Brix; continue disease management protocols if applicable; assess row-middle weed management
THIRD WEEK IN AUGUST -
Grape Berry Moth Risk Assessment protocol (Bulletin 138. Risk Assessment of Grape Berry Moth and Guidelines for Management of the Eastern Grape Leafhopper)
DAMAGE THRESHOLD IS 15% DAMAGED CLUSTERS

Continue disease management protocols if applicable

MONITORING REQUIRED: determine when berries reach 8° Brix

• Scouting for grape berry moth damage should be accomplished for high-risk vineyards at this time. There are no further scouting requirements for vineyards classified as low- or intermediate-risk for grape berry moth. Research has shown that there is no risk of further economic damage from grape berry moth in low- and intermediate-risk vineyards if the risk assessment protocol has been followed to this point in the season. The sampling procedure for Grape Berry Moth Risk Assessment is the same as in the third week in July except that the damage threshold at this scouting is an average of 15 percent damaged clusters. Both the interiors and the edges of vineyards should be scouted.
• Disease Management
  Berries are no longer susceptible to infection by black rot and powdery mildew at 8° Brix, which occurs in the latter part of August in an average year. Varieties that are susceptible to powdery and/or downy mildew should continue to receive an appropriate disease management program to limit foliar infections, which can lead to premature leaf fall in years conducive to disease development.

PREHARVEST -

  Weed mapping

• To determine the effectiveness of the current year's herbicide program and to assist in developing next year's, it is important to determine which weeds are present in the vineyard. The Weed fact sheets will help in the identification of many of the common weeds found in vineyards. Creating vineyard maps with locations of weeds, weed species present, and weed densities between and under rows will enable the creation of the herbicide program needed for the ensuing year.

REFERENCES:
GRAPE IPM IN THE NORTHEAST
by T. Weigle and J. Kovach, New York State Integrated Pest Management Program; Publication Number 211 1995