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Search Our KnowledgebaseDouble A Vineyards is a family owned operation dedicated to supplying you with high quality grapevines, along with berry plants, figs trees and juice for wine making. We began production in 1990 with a small number of grapevine cuttings; since then, we have grown to over two million. We have also increased our grapevine variety list to over 150, with production of other varieties by request. Beyond offering a robust plant selection, we are also committed to treating our customers how we’d want to be treated – like family.
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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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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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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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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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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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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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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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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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Rick Dunst, Viticulturist, Double A Vineyards, Inc. It is the time of year when our office starts receiving calls about “bumps” forming on grape leaves. While pest identification is usually quite difficult when based solely on a rough description of the symptoms, “bumps” on grapevine leaves are almost always associated with the aerial, …
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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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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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Rick Dunst, Viticulturist, Double A Vineyards, Inc. This month’s article is inspired by several e-mails and phone calls received over the past few weeks from all over the country regarding yellow jackets in vineyards and how to control them. Unfortunately, there are no easy solutions to this group of insects, and they can …
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Rick Dunst, Viticulturist, Double A Vineyards, Inc. After successfully managing a crop to within weeks or even days of harvest, few things can be as frustrating as fruit damaged by birds and other pests. In addition to direct loss of fruit, bird-damaged fruit is also more susceptible to various fruit rots that can cause …
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