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Pest/Disease Management

PD/GWSS Winegrape Assessment set at $1.25 for 2023 Harvest

To continue funding crucial research combating winegrape pests and diseases, the Pierce’s Disease/Glassy-Winged Sharpshooter Board kept the PD/GWSS Winegrape Assessment rate at $1.25 per $1,000 value for the 2023 harvest. The Board ensures grower funds are utilized wisely and productively to support the development of innovative solutions to PD, GWSS, and seven additional designated winegrapes pests and diseases. The 2023 …

Grape Scale and Grape Mealybug Management in Missouri Vineyards

These two insects share a lot in common. Both can be found on grapevines but seldom are they readily apparent to the naked eye. First the bark needs to be peeled away from the trunk or cordon to reveal the insects (Figure 2). If these insects are apparent, the insects you are seeing are female. These females have piercing sucking …

Grapevine Leafroll Virus Survey for Mid-Atlantic Growers

PennState Extension — Grapevine leafroll-associated viruses (GLRV or Grape Leafroll Virus Disease) are widespread in many grape-growing areas in the mid-Atlantic region. As the mid-Atlantic region becomes more heavily invested in cultivars of V. vinifera, which are most susceptible to the effects of these viruses, the disease caused by these viruses will inevitably become a more severe problem for our grape …

If Your Vines are Shedding Bark, Don’t be Alarmed

One of the conditions observed in vineyards, that may seem alarming, is the shedding and loss of bark on loss on grape vine trunks. Cursory research shows this is not a condition to be concerned about, unless you are just growing vines for lawn ornaments. The process is a natural succession in the plant’s growth cycle. The vascular cambium, or …

Japanese Beetle Emergence Underway in Minnesota Vineyards

Throughout much of southern Minnesota, Japanese Beetle (JB) emergence is underway. It will be several weeks before adult feeding damage becomes a concern for fruit crops, so growers have time to prepare and review pest management strategies. Adult beetles, with an appetite for >300 host plants –including several fruit crops, sweet corn, linden trees and roses, to name a few …

Newly Identified Aspergillus Vine Canker Afflicting California Vineyards

As if there weren’t enough trunk diseases impacting California vineyards, UC Davis Plant Pathologist Akif Eskalen has been researching a newly identified disease causing a canker on the trunk of grapevines accompanied by fruit disease/sour rot symptoms. Watch this brief interview with Akif, and read more about it disease management in American Vineyard Magazine Please thank this video’s sponsor Ranch Systems for …

Combatting the Arch Nemesis Pest of the CA Grape Industry

The arch nemesis pest of the California grape industry continues to spread to more grape growing areas. Vine mealybug damage not only leads to black sooty mold on grapevine leaves and clusters, but it can also transmit and spread grapevine leafroll associated viruses that have been devastating vineyards.  Watch this brief interview with UCCE Kern County Entomology Advisor David Haviland …

Mitigating the Effects of Grapevine Red Blotch Disease

With grapevine red blotch disease widespread across the west, what’s a grower to do with a young or old vineyard that contracts this disease?  How does it impact grape yield and quality and are there ways to mitigate the detrimental effects of this disease?  Watch this brief interview with the new UCCE San Joaquin County Viticulture Advisor Justin Tanner to …

The Southeastern Spread of Spotted Lanternfly

Spotted lanternfly, Lycorma delicatula (White), is an invasive pest that is being watched closely in many states – not only the states with current infestations, but also areas where the insect is likely to show up next, or those with the most vulnerable crops.  The most vulnerable crop is grape, so this will be of interest to many readers here.  Spotted lanternfly …

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