See page 7 for upcoming vineyard walks across Wisconsin - 4 locations

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1 NO Vineyard IPM Scouting Report for week of 25 June 2012 UW-Extension Door County and Peninsular Agricultural Research Station Sturgeon Bay, WI Uncommon Grape Pests become Common Problems in 2012 True armyworm Although not considered a pest of grapes, the true armyworm caused some damage to grape leaves over the past couple of weeks. The first generation is complete throughout most of Wisconsin at this point. If you did see damage in the vineyard from true armyworm, be prepared for the second generation, which will likely be emerging in 2 to 3 weeks. Vineyards located near small grains (winter wheat), corn, or large grassy areas should be scouting and monitoring for armyworm in July. True armyworm is a cyclic pest and this year black light captures of adult moths are extremely high compared to previous years. Although grasses are the preferred host, in outbreak years and when the larvae are on the move, most any plant will do as a food source. In Door County, we even experienced true armyworm damage on apples. The larvae bit into the apples and even did some burrowing but the larvae did not consume apple leaves. For more information and to view a picture please use this link Variegated cutworm Another pest that has been causing some damage is the variegated cutworm. Like the true armyworm, the variegated cutworm larvae typically feed at night and so it is difficult to identify the problem pest unless you scout at night. Although damage has not been severe, many growers have been contacting me regarding damage to grape leaves. For more information and to view a picture please use this link For both true armyworm and variegated cutworm, damage has been minimal on mature (fruit producing) vines. Your concern should focus on young or establishing vines, as severe defoliation of young vines can lengthen the period from planting to fruit bearing. Damage from both of these pests typically begins on border rows, but if populations are high, especially with true armyworm, damage can occur throughout the vineyard. Control efforts are directed at the larval stage of both pests and if you are considering applying a pesticide, pesticides should be applied when the larvae are small (1 inch or less). Pesticides applied to advanced larval stages have limited effectiveness. The same pesticides listed for climbing cutworms will control both true armyworm and variegated cutworm. (See page 11 of the 2012 Midwest Fruit and Grape Spray Guide) See page 7 for upcoming vineyard walks across Wisconsin - 4 locations

2 2 Potato leafhopper Potato leafhoppers are above threshold levels in many alfalfa fields in Wisconsin and this should put grape growers on alert for this pest. A typical management program for leafhoppers in alfalfa is to harvest the crop before economic damage occurs. This often results in leafhoppers finding an alternative food source. If your vineyard is located adjacent to alfalfa be sure to monitor your plants for potato leafhopper. Leafhoppers are sucking insects and damage is caused by toxins injected into the leaf while feeding. The toxins cause the leaves to cup and often expanding leaves are misshapen. Severe feeding results in leaf stippling and chlorosis. The threshold in Ontario is 50% of the shoots displaying damage and this is reduced to 25% if the grape vines are under water stress. The most sensitive grape varieties are vinifera varietals with lambrusca varietals being almost immune to leafhopper injury. We do not have a good understanding of damage from leafhoppers on any cold-climate varietals. If any growers experience damage from potato leafhoppers, I would appreciate some photographs and also identify the variety damaged. For more information and to view a picture please use this link What s lurking in or near the vineyard this week? Phylloxera galls (left) on wild grapes at PARS have become more abundant over the past week. Grape berry moth (GBM) (right) in grape cluster. When scouting clusters for GBM look for berries webbed together. Inset picture shows close up of berry with a GBM sting (larva entry point into fruit).

3 Development of wine grapes in the grape variety trials at the Peninsular Agricultural Research Station (PARS) Sturgeon Bay, WI and West Madison Agricultural Research Station (WMARS), Madison, WI 3 Brianna at PARS Brianna at WMARS Foch at PARS Foch at WMARS Frontenac at PARS Frontenac at WMARS

4 4 Development of wine grapes in the grape variety trials at the Peninsular Agricultural Research Station (PARS) Sturgeon Bay, WI and West Madison Agricultural Research Station (WMARS), Madison, WI La Crescent at PARS La Crescent at WMARS La Crosse at PARS La Crosse at WMARS Marquette at PARS Marquette at WMARS

5 5 Development of wine grapes in the grape variety trials at the Peninsular Agricultural Research Station (PARS) Sturgeon Bay, WI. NY 76 at PARS Vignoles at PARS Petite Pearl at PARS Two year old vines Noiret at PARS Leon Millot at PARS Wild grapes at PARS

6 6 Degree Day 1 (base 50) Accumulation from April 1 to June 24, 2012 at Peninsular Agricultural Research Station in Sturgeon Bay, WI Date Year Average 2 4/1 to 6/ Modified method. 2 Average from 2007 to Degree Day 1 (base 50) Accumulation from April 1 to June 24, 2012 at West Madison Date Year Average 2 4/1 to 6/ Modified method. 2 Average from 2007 to Accumulated degree days 1 (base 50) for the month of March in Sturgeon Bay and Madison, WI. Year Madison WI Sturgeon Bay WI Modified method. 2 Data from GDD (base 50, ceiling 86) Please scout your vineyards on a regularly scheduled basis in an effort to manage problem pests. This report contains information on scouting reports from specific locations and may not reflect pest problems in your vineyard. If you would like more information on IPM in grapes, please contact Dean Volenberg at (920) or

7 Regional Vineyard Walks The UW-Extension Fruit Team will be hosting 4 regional summer vineyard walks for 2012, according to Rebecca Harbut, the UW-Extension Fruit Specialist. With the continued growing interest in commercial wine and table grape production in Wisconsin, the Fruit Team decided to host the vineyard walks regionally to reach more growers and those interested in becoming a commercial grower. Each regional vineyard walk will be hosted by a grape grower with vines in production. The vineyard walk leader will evaluate the vines and answer questions that participants may have about commercial production practices. With the vineyard walks scheduled for 4 different dates, growers can attend the closest walk or attend any of the four if desired. The vineyard walks are held rain or shine so come prepared. Participants are also asked to bring lawn chairs for the grower socializing following the walk. Northwest Wisconsin Sunday, July 15, Spirit Creek Vineyard, 3555 Blom Lake Dr., Frederick, WI 1:00-3:00 p.m. Mike and Sue Jahnke and their family started planting Frontenac and Marquette grapes in They have added La Crescent, Petite Pearl, Brianne and Summerset. Vineyard walk leader is UW-Extension Fruit Specialist Rebecca Harbut. Registration fee is $5 payable at the vineyard walk. Please the number attending to or call the Spooner Area UW-Extension Office at Attendees may bring a wine to share. Northeast Wisconsin Saturday, July 21 Himmelgarten Vineyard, Newton Road, Newton, WI 4:00 8:00 p.m. Randy and Faye Riester planted their first Baco Noir grapes three years ago so this fall will be their first harvest. Vines are trained on a VSP system with unique in-line posts. Vineyard walk leader is UW-Extension Ag Agent Dean Volenberg. Registration is $20 which will include a catered meal. Attendees may bring a wine to share. Please send payment one week in advance to the Door County UW-Extension Office, Attn. Vineyard Walk, 421 Nebraska St., Sturgeon Bay, WI If you have question, Southwest Wisconsin Saturday, August 4 Viriditas Vineyard, E8101 Green Acres Rd., Viroqua, WI 4:00 8:00 p.m. Jeff and Mary Aderman planted their first Frontenac and Frontenac Gris vines in Since then they have added La Crescent, Marquette and Brianna. One of the biggest challenges that the vineyard had to experience a couple of years ago was the grape ripe rot infestation. Vineyard walk leader is Mark Hart, a private grape vine breeder from Bayfield, Wisconsin. Registration is $20 which will include a catered meal. Attendees may bring a wine to share. Please send payment one week in advance to the Vernon County UW-Extension Office, Attn. Vineyard Walk, Suite 392, 318Fairlane Dr., Viroqua, WI If you have questions, Southeast Wisconsin Sunday, August 12, Staller Estate Vineyard and Winery, W8896 County Rd. A, Delavan, WI 10:30 a.m. 2:00 p.m. Joe and Wendy Staller planted their first Frontenac, Foch and La Crescent vines in 2008 They planted with the plans to open a winery of which they did also in Vineyard walk leader is UW-Extension Fruit Specialist Rebecca Harbut. Registration fee is $30 which will include a catered wine food pairing meal. The winery is a state licensed facility so attendees are asked not to bring any wine to share. Wine from the Staller Winery will be supplied. Registration is limited to 40 people. Please send payment one week in advance to the Walworth County UW-Extension Office, Attn. Vineyard Walk, PO Box 1001, 100 W. Walworth St., Elkhorn, WI If you have questions,

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