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This item involves a coast-to-coast missive from thegrape research folks at Cornell University to theNational Grape Research Alliance in Sacramento to ourgrape-growing readership throughout the West. If, as the researchers believe, roguing and cleanreplanting is the cornerstone of a successful leafrolldisease management program, they advise -- a vineyardscouting and counting of diseased vines divided by thenumber of vines inspected to determine prevalence of thedisease. "If spread occurs and prevalenceis 25% or less, flag the vines and two vines on eitherside, remove them and replace them with clean vinesderived from scion and rootstock vine stocks tested forviruses and found to be clean. [Extracted from the article]

Discussion topics Topics to be discussed on the first day include canopy management; irrigation; Wyoming climate and soils; grape vineyard pests; and layout and site selection. Topics to be discussed are existing trellis rehab and maintenance; planting new vines on an existing trellis; overgrown vine rehabilitation; and vineyard training and pruning. [Extracted from the article]

Discussion topics Topics to be discussed on the first day include canopy management; irrigation; Wyoming climate and soils; grape vineyard pests; and layout and site selection. Topics to be discussed are existing trellis rehab and maintenance; planting new vines on an existing trellis; overgrown vine rehabilitation; and vineyard training and pruning. [Extracted from the article]

Discussion topics Topics to be discussed on the first day include canopy management; irrigation; Wyoming climate and soils; grape vineyard pests; and layout and site selection. Topics to be discussed are existing trellis rehab and maintenance; planting new vines on an existing trellis; overgrown vine rehabilitation; and vineyard training and pruning. [Extracted from the article]

Discussion topics Topics to be discussed on the first day include canopy management; irrigation; Wyoming climate and soils; grape vineyard pests; and layout and site selection. Topics to be discussed are existing trellis rehab and maintenance; planting new vines on an existing trellis; overgrown vine rehabilitation; and vineyard training and pruning. [Extracted from the article]

Topics to be discussed are existing trellis rehab and maintenance; planting new vines on an existing trellis; overgrown vine rehabilitation; and vineyard training and pruning. Discussion topics Topics to be discussed on the first day include canopy management; irrigation; Wyoming climate and soils; grape vineyard pests; and layout and site selection. [Extracted from the article]

A grape grower's experience Phipps says the owner had two vineyards, one at ground zero, about 2 miles away from where they found the initial infestation of spotted lanternfly in Pennsylvania in 2014. "We're very concerned for our vineyards, and those that might have grapevines in their backyard as hobby crops", says Sarah Phipps, Missouri Department of Agriculture plant protection specialist. [Extracted from the article]

The article focuses on the nursery tradition continued by Jim Duarte and his family that revolutionized commercial grapevine and nut tree production. According to Duarte, the problem in the grape vine industry in 2008 was viruses. He states on a heat-treatment method pioneered by U.S. Department of Agriculture (USDA) plant pathologist Austin Goheen to develop virus-free vines.

In grapes, Zhuang suggests growers employ late pruning of vines in February or March, when the vines can more quickly recover from those wounds and heal from the pruning cuts. As growers employ mechanical pruning, Zhuang says this technology tends to be problematic as the rough way the machines cut the vines - almost ripping them versus the clean cuts of manual pruning techniques - leaves more points of entry for pathogens to attack vines. [Extracted from the article]

Pruning used to happen early, as early as December decades ago, until it was discovered that early winter pruning meant wounds stayed susceptible for up to 3-4 weeks to infection by spores of the fungi that caused trunk diseases. Even in the absence of trunk diseases, there's good pruning practices and bad pruning practices that can affect vine growth. The whole issue of pruning timing is directly connected with the concern about grapevine trunk diseases, called one of the most relevant challenges of viticulture with worldwide economic impact of GTDs estimated to be well over $1.5 billion annually. [Extracted from the article]

Researchers from Washington State University and the Washington State Wine Commission will hold a webinar March 4 to discuss the white-headed grape leaffolder, a relatively new pest that's showing up in vineyards in the Pacific Northwest. He will also identify effective insecticides that fit integrated pest management strategies and have minimal impact on beneficial insects, the webinar's organizers say. [Extracted from the article]

Researchers from Washington State University and the Washington State Wine Commission will hold a webinar March 4 to discuss the white-headed grape leaffolder, a relatively new pest that's showing up in vineyards in the Pacific Northwest. He will also identify effective insecticides that fit integrated pest management strategies and have minimal impact on beneficial insects, the webinar's organizers say. [Extracted from the article]

Researchers from Washington State University and the Washington State Wine Commission will hold a webinar March 4 to discuss the white-headed grape leaffolder, a relatively new pest that's showing up in vineyards in the Pacific Northwest. He will also identify effective insecticides that fit integrated pest management strategies and have minimal impact on beneficial insects, the webinar's organizers say. [Extracted from the article]

Researchers from Washington State University and the Washington State Wine Commission will hold a webinar March 4 to discuss the white-headed grape leaffolder, a relatively new pest that's showing up in vineyards in the Pacific Northwest. He will also identify effective insecticides that fit integrated pest management strategies and have minimal impact on beneficial insects, the webinar's organizers say. [Extracted from the article]

Researchers from Washington State University and the Washington State Wine Commission will hold a webinar March 4 to discuss the white-headed grape leaffolder, a relatively new pest that's showing up in vineyards in the Pacific Northwest. He will also identify effective insecticides that fit integrated pest management strategies and have minimal impact on beneficial insects, the webinar's organizers say. [Extracted from the article]

The article focuses on the biological method to prevent wine grapes from Pierce's disease which is caused by Xylella fastidiosa bacteria. Topics discussed include economic cost of Pierce's disease to grape growers, symptoms of Pierce's disease and use of benign strain of bacteria to control the disease.

Long, hot summer days paired with a dry climate means one thing for grape growers: insects. Vine mealybugs produce a substance called honeydew that drops onto the bunches and other vine parts. Products such as ASSAIL SP ® sp and BIFENTURE SP ® sp EC Insecticides offer protection designed specifically to ward off harmful insects including the mealybug, leafhopper and other key grape pests. [Extracted from the article]

Long, hot summer days paired with a dry climate means one thing for grape growers: insects. Vine mealybugs produce a substance called honeydew that drops onto the bunches and other vine parts. Products such as ASSAIL SP ® sp and BIFENTURE SP ® sp EC Insecticides offer protection designed specifically to ward off harmful insects including the mealybug, leafhopper and other key grape pests. [Extracted from the article]

Long, hot summer days paired with a dry climate means one thing for grape growers: insects. Vine mealybugs produce a substance called honeydew that drops onto the bunches and other vine parts. Products such as ASSAIL SP ® sp and BIFENTURE SP ® sp EC Insecticides offer protection designed specifically to ward off harmful insects including the mealybug, leafhopper and other key grape pests. [Extracted from the article]

Long, hot summer days paired with a dry climate means one thing for grape growers: insects. Vine mealybugs produce a substance called honeydew that drops onto the bunches and other vine parts. Products such as ASSAIL SP ® sp and BIFENTURE SP ® sp EC Insecticides offer protection designed specifically to ward off harmful insects including the mealybug, leafhopper and other key grape pests. [Extracted from the article]

Long, hot summer days paired with a dry climate means one thing for grape growers: insects. Vine mealybugs produce a substance called honeydew that drops onto the bunches and other vine parts. Products such as ASSAIL SP ® sp and BIFENTURE SP ® sp EC Insecticides offer protection designed specifically to ward off harmful insects including the mealybug, leafhopper and other key grape pests. [Extracted from the article]

University of California, Davis viticulturist Dr. Andrew Walker and his research team announced success in developing five new grape varieties proven resistant to Pierce's disease - two blancs and three noirs. It's a normal part of working conditions, but various pests and viruses remain of concern in 2020, like grapevine red blotch disease, a major threat to the $162 billion domestic grape industry. [Extracted from the article]

While the disease has been around since the beginning of wine grape production in California, concerns have escalated with the arrival of the nonnative glassy-winged sharpshooter, which has the potential to spread the disease more rapidly. "So far there has not been tremendous interest in new wine grape varieties, but climate change may encourage growers to reconsider wine grape breeding as we work to address future climates and diseases". [Extracted from the article]

While the disease has been around since the beginning of wine grape production in California, concerns have escalated with the arrival of the nonnative glassy-winged sharpshooter, which has the potential to spread the disease more rapidly. "So far there has not been tremendous interest in new wine grape varieties, but climate change may encourage growers to reconsider wine grape breeding as we work to address future climates and diseases". [Extracted from the article]

While the disease has been around since the beginning of wine grape production in California, concerns have escalated with the arrival of the nonnative glassy-winged sharpshooter, which has the potential to spread the disease more rapidly. "So far there has not been tremendous interest in new wine grape varieties, but climate change may encourage growers to reconsider wine grape breeding as we work to address future climates and diseases". [Extracted from the article]

While the disease has been around since the beginning of wine grape production in California, concerns have escalated with the arrival of the nonnative glassy-winged sharpshooter, which has the potential to spread the disease more rapidly. "So far there has not been tremendous interest in new wine grape varieties, but climate change may encourage growers to reconsider wine grape breeding as we work to address future climates and diseases". [Extracted from the article]

UC: Leaving unsold grapes on vine "makes sense" University of California viticulture experts say it "makes sense" to leave unsold grapes to wither on the vine when the prices offered would be less than the cost of production. With this year's yields coming in average or better and with a significant unsold inventory of bulk wines, custom-crushing uncontracted grapes in 2019 may not be worth the expense, Smith and Giovannini wrote in an essay earlier this month. [Extracted from the article]

In an ideal world, we'd have virus-free vines and problem-free vineyards. Severe virus disease problems during the '50s spurred UC and USDA scientists to develop methods for grape virus disease detection and eradication. According to one UC, Davis report focused on grapevine leafroll, providing disease-free grapevines and rootstock to California's famed North Coast wine region is a multimillion-dollar money-saver. [Extracted from the article]

The article offers tips to the grape growers on increased disease pressures during the wet spring season that will give rise to diseases such as Botrytis bunch rot or Powdery mildew.

The article offers the author's list of do's and don'ts for controlling grape diseases during harvesting season in vineyards.

The article discusses the role played by fungicides in preventing grape diseases.

The article reflects on negative impact of sugar accumulation disorder (SAD) on grape yields as SAD causes poor berry coloration and low sugar accumulation, and mentions views of Chuck Ingels of the University of California Cooperative Extension, on SAd that is triggered after veraison.

The article focuses on a study on mating disruption to control vine mealybug in table grapes being conducted at in University of California studies, and mentions that the pest, Planococcus ficus, is the most significant one in California table grapes.

The article focuses on the problem of Powdery mildew disease, which is caused by the pathogen Erysiphe necator, has been a constant problem for grape growers in California, and prompts for strategies to deal with the problem.

The article offers information on the seeking solutions for red botch disease by researchers and wine grape growers, and efforts by entomologist Frank Zalom on the need for growers to remove infected plants.

The article presents research on ways to reduce the spread of vine mealybug (VMB) in the U.S. The authors examine survival of VMB by using a Bucher press with a 150 hL capacity to process 6 tons of Grenache clusters infested with VMB. They also assess VMB survival in two types of waste piles by doing experiments that utilize round piles of pomace.

Reports on the powdery mildew problem of grape growers in California. Powdery mildew trial conducted by George Levitt, a Madera County farm advisor; Recommended methods for controlling powdery mildew.

Reports on effects of vineyard berms in wine grapes production. Breeding ground for pests; Damage to fruits cause by the weeds; Comments of Preston Watwood, vineyard manager of General Vineyards Services in Salinas Valley, California, on effects of weedy berms on vines; Features of Monterey County which make it idea for weeds.

The article reports on the success of California to eradiacate the European grapevine moth (EGVM).

The article focuses on a research finding, confirming that a three-cornered alfalfa treehopper is responsible for the red blotch virus in grapes during a test conducted inside a greenhouse by a group of University of California Davis Entomologist.

The article discusses the removing of the diseased vine from the vineyard for an effective disease control measure. Topics include discussion on Pierce's disease (PD) by Matt Daugherty, a cooperative Extension specialist, Grapevine leafroll-associated virus infections in grape vines, and consistent vine removal as a pronged approach in combating infections.