http://groups.ucanr.org/sbdisplay/blogs.cfm?county=1385&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed en-us UC ANR http://cyber.law.harvard.edu/rss/ Sat, 21 Nov 2009 15:44:58 PST Sat, 21 Nov 2009 15:44:58 PST European grapevine moth (aka European grape berry moth; (Lobesia botrana) was recently found in Napa County, a first known find for California. The insect has the potential to cause great economic harm to California’s diverse grape industries. The moth was trapped in Napa County’s, famous Oakville grape growing region known for high valued wines. Common to Europe and the Mediterranean, European grapevine moth has been intercepted from across the US where international travelers, cargo or mail......
]]> Tue, 03 Nov 2009 06:43:44 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1943&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1943 University of California (UC) researchers have extended information at Grape Days for 58 years.  Here is a brief history, as remembered by Amand (Kas) Kasimatis and L. Peter Christensen, Extension Specialist Emeriti, Dept. of Viticulture and Enology, UC Davis. Commodity days were quite popular on the Davis campus in the early fifties; the first Grape Day was held there in Aug., 1951.  H. B. Richardson, Ext. Specialist, and A.J. Winkler, Chair of the Dept. of Viticulture and Enology, organized...... Mon, 10 Aug 2009 15:44:43 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1599&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1599 Erineum mite populations seem to be exploding this season. In the past two weeks, a half-dozen samples have been dropped off at my office for inspection. Normally, a few samples are brought in from backyard vineyards, which I expect. However, the most recent samples and calls have been from commercial wine grape vineyards with concerns that it is downy mildew. First, let me assure you that it is not downy mildew. The Valley has not experienced an outbreak of downy mildew since the......
]]> Fri, 19 Jun 2009 15:09:10 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1418&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1418 Recently we joined Facebook, a social networking site on the internet. To find us, click on the following link: San_Joaquin_Valley_Viticulture. Our pages are public, so you may visit them and view all of the content, without subscribing to Facebook. When you first visit our site you’ll notice several tabs near the top center portion of the page. Currently, the tabs are labeled “Wall”, “Info”, “Photos”, “Boxes”, and......
]]> Fri, 19 Jun 2009 13:48:50 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1415&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1415 Have you recently removed an old vineyard that had treated grape stakes and now have piles sitting on your property and don’t know how to get rid of them? The Natural Resources Conservation Service (NRCS) is offering financial assistance to California grape growers to help properly dispose of chemically-treated wooden stakes. Treated grape stakes are typically treated with preserving chemicals that protect the wood from insect attack and fungal decay. Chemicals added to preserve wood and......
]]> Fri, 29 May 2009 14:16:24 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1338&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1338 With the passing of bloom, table grape growers are turning their attention from managing fruit set to maximizing berry size. One practice that increases berry size is girdling, removing a thin strip of bark from around the vine trunk. The girdle disrupts the flow of carbohydrates from the vine's canopy to its roots; the young berries grow fat on the extra sugar that would otherwise have been consumed by the roots. Special double-bladed knives are used to make the girdles. Keeping the...... Fri, 22 May 2009 15:12:56 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1313&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1313 Grapevines throughout California are now blooming. The flowers have a powerful and unique scent that reminds me of an herbal shampoo. Recently it was discovered that the characteristic odor of grapevine flowers is emitted from their pollen grains, unlike other flowers such as roses, whose scent arises from their petals. In addition to being unscented, grape flowers don't have much visual interest; the petals are green-colored and are fused together, forming a structure......
]]> Wed, 13 May 2009 17:00:24 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1281&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1281 Grapevine powdery mildew is a pathogenic fungal disease of grapes, the management of which is a yearly challenge for California grape growers. Since the mid-80’s, multiple fungicides have been registered for grapevine powdery mildew management. The first of these was Bayleton, a demethylation inhibitor (DMI). It controlled mildew well for two seasons, after which growers noticed a sharp decrease in efficacy. Growers were experiencing powdery mildew fungicide resistance firsthand.......
]]> Tue, 14 Apr 2009 10:53:15 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1185&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1185 With the prediction of rain next Monday (April 6th), Valley growers should consider applying a fungicide to protect young succulent growth from Phomopsis infections. Spring showers create optimal conditions for Phomopsis viticola pycnidia to begin producing spores that can easily spread and infect susceptible cultivars such as Thompson Seedless, Flame Seedless, Redglobe and Grenache. Timely fungicide applications are paramount in managing this disease when spring rains are predicted.......
]]> Thu, 02 Apr 2009 15:26:26 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1155&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1155 The 2009 grape growing season has commenced—Thompson Seedless budbreak occurred on March 17th—and warm weather is predicted in the days ahead. The predicted temperatures are optimal for quick spring growth and for the development of powdery mildew. To improve powdery mildew control, Valley grape growers should consider incorporating the UC Davis powdery mildew risk assessment index (RAI) into their management programs. The advantage of using the RAI will be during periods of low...... Wed, 25 Mar 2009 16:28:04 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1128&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed sjvasquez@ucdavis.edu(Stephen Vasquez) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1128 Dormant grapevines can withstand temperatures that are much lower than those normally encountered in the San Joaquin Valley. However, warm weather causes the dormant buds to deacclimate to the cold, and the succulent green tissue that emerges in the spring has little cold tolerance and can be killed by temperatures that would not injure dormant vines. It is common in the San Joaquin Valley to have warm, pleasant weather following budbreak, which instills......
]]> Tue, 24 Mar 2009 16:45:08 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1125&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=1125 On grapevines, spontaneous mutations occassionally give rise to shoots having unique characteristics. Pomologists generally refer to such shoots as "sports". If a sport has desirable characteristics, such as higher yields, or better fruit quality, than the parent plant, the sport may be collected and propagated. Sports that are very different from the parent plant may be considered a new cultivar, or if the differences are less striking, they may be considered a new......
]]> Wed, 28 Jan 2009 11:29:54 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=967&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=967 This year I've resolved to use newer (for me) technologies, including this blog, as a tool for extending viticultural information. The goal of my blog will be to provide timely information useful to raisin, table, and winegrape growers. I've also established a twitter profile (grapetweets) for extending short bits of information and am evaluating other electronic services as well. I expect that it will take a little while to develop a feel for the best way to use these electronic...... Mon, 19 Jan 2009 13:04:58 PST http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=943&utm_source=RSS&utm_medium=RSS&utm_campaign=RSS%2BFeed mwf@uckac.edu(Matthew Fidelibus) http://ucanr.org/blogs/blogcore/postdetail.cfm?postnum=943