News and Announcements!

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 selecting cultivars that are relatively disease-resistant, and by planting the vineyard in a location with full sunlight and good air movement. However, in humid climates, some fungicide applications are almost always needed to maintain a healthy canopy of leaves and/or disease-free fruit. Most fungicides are applied to prevent the development of diseases, while insecticides are usually applied when insects are present and have met or exceeded established thresholds. In very small vineyards weeds can be controlled by hand-pulling or hoeing, or by applying organic or synthetic mulches, but larger vineyards often require the application of chemical herbicides. Finally, wildlife predation by deer, rabbits, and birds is sometimes accomplished with the use of exclusion devices such as fences and netting, but repellant sprays are sometimes needed to minimize predatory damage to young vines or to fruit.

Read More »

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, variety release bulletins, and our own and other grower’s experiences.

Read More »

Rick Dunst, Viticulturist, Double A Vineyards, Inc.

There are many factors that influence whether or not a specific grape selection will survive and be capable of producing high quality fruit at a certain location, including winter hardiness, length of growing season, and risk of spring frost. A common measure of the growing season is Growing Degree Days (GDD). Grapevine development during the growing season is strongly influenced by air temperature, with little plant development occurring below 50°F. GDD estimates the heat accumulation of the growing season. GDD are calculated by subtracting 50 from the average daily temperature; if that value is less than 0, then the GDD accumulation for that day is zero (there are no negative GDD values). The average daily temperature can be calculated as the daily high temperature plus the daily low temperature divided by 2, so

Daily GDD = (high + low)/2 – 50 Read More »

Shipping Update

We are now accepting online orders to be shipped the Spring of 2015!! 

(Books, Accessories, Chemicals, and Chemical Application Accessories will be sent out on a year round basis). 

Any chemical orders placed between now and the end of February will be held for Spring delivery as we do not inventory these products through the winter months.


Warranty/Return Policy:

Warranty:Warranty applicable only to rooted vines and plants. We are not liable for crop loss or damage from causes beyond our control. We will gladly replace any stock which proves to be untrue to variety or fails to grow the year that it is planted. We are not responsible for losses sustained over the winter. Under no circumstances is our liability greater than the cost of the stock purchased. It is mutually agreed that this is the total extent of our liability involving any matter concerning our product. All claims must be submitted by August, 15th of the year the product is delivered. For losses in excess of 10% we require notice within 30 days of planting so we can verify practices. Only applicable to vines planted by June 1st.


Receive Our Email Newsletter

Join our email list and receive exclusive viticulture content from Double A Vineyards. You can unsubscribe anytime, and we will never sell or rent your email address.