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Pest/Disease Management

Fresno State Researchers Investigate Smoke Taint in Wine Grapes to Help Define Thresholds

Viticulture and enology researchers from multiple universities have been feverishly working with the western wine grape industry to learn more about how wildfire smoke impacts developing wine grapes. The hope is to develop some form of industry standard threshold for smoke taint, so that wine grapes will not be rejected at the winery unless they have truly been compromised.  Watch …

Dealing with Powdery Mildew Outbreaks in Missouri Vineyards

Grape growers as well as my visual observations confirm that some vine- yards are experiencing powdery mildew outbreaks. If your vineyard is experiencing a powdery mildew outbreak after the application of a DMI fungicide (Frac Code 3) then consider that the powdery mildew may have developed resistance. Powdery mildew resistance to DMI inhibitors was confirmed in Missouri in 2021. Some …

Harnessing the Power of Natural Volatile Compounds in Grapevines that Thwart Sharpshooters

Grapevines have a natural defense mechanism against Glassy-winged sharpshooter, a notorious vector for Pierce’s disease, that researchers are trying to learn more about. Watch this brief interview with Julie Pedraza from the Fresno State Viticulture & Enology Research Center and read more about it in American Vineyard Magazine. Please thank this video’s sponsor Suterra for their industry support.

Stomp the Spot(ted Lanternfly) Movement

Virginia’s most infamous hitchhiker is on the move again: the spotted lanternfly. These insects colonize quickly, disrupt native ecosystems, and potentially cause problems to agriculture and forest health. The spotted lanternfly is also a significant threat to Virginia’s grape and wine industries. The College of Agriculture and Life Sciences at Virginia Tech and the Virginia Department of Agriculture and Consumer Services are partnering to empower …

Pediococcus Wine Spoilage: Concern or Confusion?

Of the three main genus of lactic acid bacteria found in wine, Pediococcus is one of the least well characterized. Despite it commonly being found in wines around the world, it is still difficult to answer the simple question ‘what impact will it have on my wine?’ Unlike say Brettanomyces, whose spoilage potential is well described, the spoilage risk that …

Drosophila and Sour Rot Management in Georgia Grapes

With the increase in sugars, veraison kicks off the period to start managing drosophilid flies (e.g. spotted wing drosophila (SWD)), which can considerably help suppress sour rot in your vulnerable grapes. The drosophilid flies are active nearly year round in these parts, but near veraison, as the brix levels in wine grapes reach approximately 15 degrees Brix, the grapes become attractive (and thus susceptible) to SWD. …

First Detection of Spotted Lanternfly in Michigan

Spotted lanternfly (Lycorma delicatula) has been hitchhiking across much of the northeastern United States since its discovery in southeastern Pennsylvania in 2014. The pest can now be found in at least 13 states, including a small, localized population in Oakland County, the first known occurrence of live spotted lanternflies in Michigan. This infestation appears to have been caused by spotted …

Disease Threats as Missouri Grape Harvest Approaches

As harvest approaches for Missouri grape growers, it’s important to remain vigilant to the end regarding disease management and poor weather conditions can have a significant impact on disease pressure and crop quality this time of the year.  In order for Downy mildew to infect grape tissue the tissue must be wet or have free-water available. In the absence of …

Pestalotiopsis and Neopestalotiopsis: Missouri Research Update

Some plant diseases are sporadic and only flare–up when environmental conditions or host plant health is in decline. In comparison, some diseases appear every growing season such as downy mildew or Phomopsis cane and leaf spot. The former are endophytes and can be either bacterial or fungal and live within plants for a portion of time without causing plant disease. …

Grape Scale, an Inconspicuous Grape Pest

Unlike many other insect pests that we readily see in the vineyard, the grape scale remains mainly hidden out of sight. The hidden nature of the pest can result in the populations building up over time, but even these population increases remain hidden. Sometimes your first clue that scale insects are becoming a problem is when you see vine decline. …

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