News

4_3_14

How To Select and Use Crop Protection Products in an Integrated Vineyard Pest Management Program

Rick Dunst, Viticulturist, Double A Vineyards, Inc. Double A Vineyards offers a full line of crop protection products available to our customers. There are several grape diseases that can cause crop loss directly, through infection of fruit, or indirectly, through loss of leaf area. Various insects feed on grape flowers, fruit, leaves, and roots, resulting …

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3_26_2014-Caption-(Black-Rot-on-grape-cluster.)

Disease Management Programs for Grapes – Part 2

Rick Dunst, Viticulturist, Double A Vineyards, Inc. Part I provided an introduction to the major diseases that affect grapes and some options for early season disease control in vineyards. Please refer to that article for links to fact sheets for five major grape diseases – anthracnose, Phomopsis, black rot, downy mildew, and powdery mildew. This article …

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3_21_14--Caption-(Black-Rot-leaf-infection.)

Disease Management Programs for Grapes – Part I

Rick Dunst, Viticulturist, Double A Vineyards, Inc. Managing disease is a key component to successful grape production. Cultural practices and variety selection can have a large impact on disease pressure and susceptibility, but most grape growers rely, to some extent, on chemical fungicide applications in order to produce disease-free fruit and foliage for the production …

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Magnesium deficiency-Leaves-Discoloration-interveinal yellowing

Vineyard Fertilizer and Nutrient Recommendations Provided by Double A Vineyards

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.     Most grape growers recognize the need to determine the nutritional status of their soil prior to planting, but it is also important to monitor the nutritional status of the vineyard on a regular basis once it is bearing fruit. Ideally, soil and petiole testing are …

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5_28_15

Managing Weeds in Vineyards

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.    When trouble-shooting the cause of poor growth in vineyards (especially newly-planted ones) competition from weeds is one of the first things to consider. In my experience, new growers often underestimate the competitive effects of weeds in the vineyard. This article will summarize some of the concepts …

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4_21_15

Grape Pest Management for the Homeowner

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.     Chemical pest management options for growers with only a few vines are limited. While non-restricted use pesticides can be purchased and used by anyone (meaning, anyone who reads and understands the pesticide label prior to application and applies it legally), they usually come in package …

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How-to-Calibrate-and-Use-a-Backpack-Sprayer

How to Calibrate and Use a Backpack Sprayer

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.     Small vineyard owners often find that they need to spray chemicals for control of weeds, insects, and disease, but can’t justify the expense of a tractor-operated sprayer (not to mention the tractor). The need for chemical applications to control grapevine diseases can be minimized by …

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2_20_15

Grapevine Hardiness and Using the USDA Hardiness Zone Maps

Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Winter injury caused by low winter temperatures is an important limiting factor to grape production in many regions the United States. Our Grapevine Characteristics Chart lists grape varieties by their winter hardiness according to USDA hardiness zone. Hardiness is determined by using a number of sources, including university publications, …

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Assessing Winter Injury in Grapevines

Assessing Winter Injury in Grapevines

The “polar vortex” of cold Arctic air that affected a large portion of the continental United States during early January 2014 was responsible for widespread transportation delays and a shutdown of activities at many schools and businesses. Blizzard conditions persisted for several days near Buffalo, New York, for the first time since 1993. Air temperatures …

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12_16_14

Grapevine Rootstocks

Rick Dunst, Viticulturist, Double A Vineyards, Inc. Selecting the proper rootstock for your vineyard is just as important as variety selection. Rootstocks are used to induce or reduce scion vigor or to overcome specific soil limitations caused by physical factors such as soil pH and high salt content, or biological factors such as phylloxera, nematodes, …

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Vineyard Design – Row Orientation, Row and Vine Spacing, and Trellis Height

Once an appropriate variety and rootstock are chosen for a site, vineyard design becomes an important consideration that will affect the performance of the vineyard for its lifetime. Considerations include row orientation, vine spacing between rows and within the row, and trellis height. Row Orientation The optimum orientation of vineyard rows is north to south …

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Red Blotch

Grapevine Red Blotch Disease

Rick Dunst, Viticulturist, Double A Vineyards, Inc.    Grapevine red blotch-associated virus (GRBaV) is a recently identified virus which represents the latest addition to the long list of graft-transmissible agents that have been discovered in grapevines. This article will summarize what is currently known and not known about red blotch, and the future for the …

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7_26_13

Wet Weather Brings High Disease Pressure to Vineyards

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Higher than average precipitation across many parts of the Eastern and Midwestern states has brought disease management issues to the forefront. Over the past several weeks, our staff has been contacted by grape growers from many growing regions with disease problems in their vineyards, many which …

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2_21_13

Pierce’s Disease of Grape

Rick Dunst, Viticulturist, Double A Vineyards, Inc. With Jim Kamas, Assistant Professor & ExtensionSpecialist – Pomology & Viticulture, Texas A&M AgriLife Extension Service, Fredericksburg, Texas Grape growers in southern regions of the United States face a potential problem not encountered by growers in more northern regions–Pierce’s disease (PD) of grape.  An excellent resource, Pierce’s Disease …

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11-16-12

Managing Vineyard Cover Crops

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Cover crop management is an important consideration in viticulture. Most vineyards are managed with some kind of ground cover in the row middles, while minimizing weed competition near the vines. There are many benefits from growing cover crops in row middles. These include reduced risk of …

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10_19_12

Sulfur Injury on Grapevines

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Powdery mildew (PM) is an important vineyard disease worldwide.  As pointed out by Cornell University grape plant pathologist Wayne Wilcox, Eastern North America is the origin of powdery mildew, and we cannot grow grapes here without controlling it.  Sulfur is a traditional material used to control …

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Grapevine Canopy Management

Top Photo Left: ‘Concord’ on TWC; Top Photo Right: ‘Vidal’ on TWC; Bottom Photo Left: ‘Pinot Gris’ on VSP, prior to leaf pulling; Bottom Photo Right: ‘Pinot Gris’ on VSP, after leaf pulling   Rick Dunst, Viticulturist, Double A Vineyards, Inc.   The production of large crops of high quality fruit requires that grapevines be pruned and trained …

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3_26_12

Establishing a New Vineyard

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.   Spring has sprung (albeit 3-4 weeks early in Western New York) and Double A Vineyards has begun shipping vines to our customers in warmer climates.  This month’s article will cover the basics of pre-plant land preparation, how to handle vines once you receive them, methods of …

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1_31_12

Grapevine Pruning with an Emphasis on Vineyard Establishment

  Entire textbooks (or chapters of textbooks, anyway) have been devoted to the topic of pruning, training, and trellising grapevines.  This article will provide a brief overview of the main concepts of pruning grapevines, with emphasis on pruning during vineyard establishment. Dormant grapevine pruning during vineyard establishment is performed annually with two main goals in …

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10_28_11

Winter Protection of Grapevines

  Rick Dunst, Viticulturist, Double A Vineyards, Inc.   As the 2011 growing season comes to an end, we all know what comes next – winter. In areas where extreme cold temperature or temperature drops occur, winter protection of grapevines may be necessary. By their nature, grafted vines are most susceptible to winter injury, particularly …

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