October 17, 2017

Dow, Monsanto Respond to Herbicide Drift Damage

Midwest Wine Press has written and reprinted a number of herbicide drift damage stories.  Herbicides that travel from corn and soybean fields into vineyards are a significant problem for Midwestern grape growers. In addition to reporting from the perspective of grape growers, we also wanted to present the views of herbicide producers. As described later in this article,  the two big Midwestern … [Read more...]

Northern Minnesota Vineyard Trial Results

Data from the first phase of a major Minnesota vineyard trial has been tabulated, according to Dennis Emslie Drummond, VESTA Coordinator at Central Lakes College in Staples, Minnesota, about 130 miles northeast of the Twin Cities.Drummond planted an experimental vineyard at Central Lakes during 2011 as part of a $203,000, four-year grant from the National Science Foundation. The project … [Read more...]

New Herbicide Resistant Crops Being Considered By USDA

Herbicide drift has become a major issue for Midwestern grape and fruit growers as more powerful herbicides are being used to replace glyphosate.  Glyphosate- the active ingredient in the most commonly used weed killers- has lost its effectiveness as many weeds have developed natural resistance to it.Increasingly, farmers are reverting to older and more potentially toxic weed killers like … [Read more...]

John Marshall: My Favorite Red Wine Grapes

This article is a companion to an earlier piece describing cold hardy white grapes that seem to have found their niche in a crisp, flowery and fruity style.Cold hardy reds, on the other hand, do not seem to have found their place or their style and as yet.  They do not seem to get the respect their white counterparts are beginning to enjoy.Even so, these reds make palatable and interesting … [Read more...]

Red Blotch Disease Identified in Ontario

Grapevine red blotch, a disease normally found on the East and West Coasts, is turning up in Ontario according to the Ontario Ministry of Agriculture, Food and Rural Affairs. Red blotch can stop grapes from fully ripening.  Red blotch first appeared in Napa Valley in 2008 and has since been observed to at least six other states and now Canada. See: Grapevine red blotch associated virus: A newly … [Read more...]

Herbicide Drift Plagues Ohio Vineyards in 2013

Most vegetable and fruit farmers have probably experienced crop injury from glyphosate spray drift at one time or another. The most recognizable name in this class is Roundup along with several other glyphosate products such as Acquire, Glystar Plus, Rodeo and Touchdown.The glyphosate group provides good control to a wide variety of broadleaves and grasses with no residual effects to the soil. … [Read more...]

Downy Mildew in Grapes – Secrets of Disease Management

Experienced grape growers saw it coming. New growers hadn’t a clue. Regardless, my crystal ball told me that with months of rain would come severe outbreaks of downy mildew in vineyards.Grape downy mildew has reached epidemic levels in some vineyards in Kentucky and other parts of the Midwest. The pathogen that causes the disease (Plasmopara viticola) is a water mold, which warrants special … [Read more...]

Heavy Early-Season Rains Create Potassium Deficiency

Potassium is important for grapevines to function and is one of the most frequent nutritional deficiencies of vines. A grapevine with inadequate potassium produces poor, unevenly ripened fruit and reduced yields. Severe deficiency results in defoliation. Leaves in the mid- to basal portions of shoots are affected. Clusters of deficient vines tend to be small with a few unevenly ripened berries. … [Read more...]

Spotting Anthracnose and Downy Mildew Quickly

Dr. Dean Volenberg from Door County Wisconsin is back this summer with his excellent "Vineyard IPM Scouting Reports."    The link below will take you to some very revealing photos of Anthacnose and Downy Mildew.  (Some of the photos are quite graphic and squeamish viewers are advised to look cautiously.)Dr. Volenberg reports that the Wisconsin Grape Growers Educational Committee Survey that … [Read more...]

Disease Alert: Current Conditions Perfect for Disease Development

This article is reprinted by permission of the authors, Dave Scurlock, OSU/OARDC Viticulture Outreach Specialist and Dr. Mike Ellis, Ohio State University /OARDC Plant Pathology.  It appeared first in The Ohio Grape Wine Electronic Newsletter. I do not want to reinvent the wheel and I know that you know (or should know) that the past couple of weeks have been as ideal of conditions for disease … [Read more...]