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Pest/Disease Management

To Use or Not Use? Dealing with Fungicide Resistance

Fungicide resistance in both grape powdery mildew and botrytis bunch rot is making growers question what fungicides are and aren’t efficacious. Like with many things in life, the answer is… “it depends.” Botrytis bunch rot. Alex Wong, during his PhD in my group, monitored fungicide resistance in Botrytis cinerea across Oregon and Washington production regions. He observed that over 50% of the Botrytis …

Reminders for Early-Season Disease Management in Virginia Vineyards

Phomopsis cane and leaf spot One of the diseases you need to consider soon after bud break is Phomopsis cane and leaf spot. It causes minor leaf spots, which are more evident to our eyes, but necrotic lesions cause more critical damage on shoots and rachis. It also causes berry rot; however, it is not common with wine grapes because …

Identifying, Mitigating and Preventing Fungicide Resistance

– SPONSORED CONTENT – Until new fungicide products with new modes of action become registered and commercialized, maintaining the efficacy of current fungicides takes a concerted effort from all high-value crop growers, professional crop advisors and consultants. You have, no doubt, heard the saying that one bad apple spoils the whole bunch. When it comes to the development of fungicide …

Protecting Your Vineyard From the Threat of Fungicide Resistance

– SPONSORED CONTENT – Every grape grower understands the challenge of controlling fungal diseases. Although fungicide applications are the most effective strategy for disease management, the rise of fungicide resistance poses a significant threat to efficacy. Growers are often unaware they have a fungicide resistance issue until devastating diseases like botrytis bunch rot and powdery mildew have caused substantial and …

Legislation Introduced to Extend Pierce’s Disease Control Program

Last week, Assemblywoman Dawn Addis, (D-Morro Bay) introduced AB 1861 to extend a vital program within the California Department of Food and Agriculture (CDFA) that protects California’s picturesque vineyards and our iconic wine industry from deadly disease. This legislation is sponsored by the California Association of Winegrape Growers and Wine Institute. “The wine industry is integral to the economic success …

New Stanislaus County Ag Commissioner Serves as Liaison Between Farmers and California DPR

At Malcolm Media’s recent Tree & Vine Expo, event host Matthew Malcolm was pleased to introduce, Linda Pinfold, the new Stanislaus County Ag Commissioner to attendees.  Watch this brief video to get to know Linda and her emphasis on serving and assisting local farmers in navigating the ever-changing pesticide regulatory environment of California. Please thank this video’s sponsor Thunder Creek Equipment for …

State of the California Pest Control Adviser

Pest Control Advisers (PCAs) in California are some of the brightest and versatile in the nation. They each generally cover a wide spectrum of crops grown under a many different conditions and pest challenges.  Watch this brief interview with Ruthann Anderson, President and CEO of the California Association of Pest Control Advisers, as she discusses the current State of the …

Invasive Vineyard Pest’s Preferred Host Plant is Everywhere

Two separate serendipitous events occurred recently that brought a plant back to the forefront of my attention. First, a few weeks ago a colleague asked me to confirm the species of a tree growing near a public garden. The garden was struggling to grow, and a cursory identification of the tree marked it as Black Walnut (Juglans nigra). Having earned …

Destructive Vineyard Pest, Spotted lanternfly Spreads to Illinois

The Illinois Department of Agriculture (IDA) has confirmed the first detection of spotted lanternfly (Lycorma deliculata) in Illinois. This invasive pest has been in the US since 2014 but has been working its way across the mid-Atlantic states finally reaching the Midwest and the Land of Lincoln. The Good Growing blog describes this insect and its life cycle while the focus of …

Pierce’s Disease Now Expanding to Higher Elevations in Georgia

As I have reported over the last 2-3 years, we are observing warming winter temperatures, and as a result, we are also observing increasing levels of Pierce’s disease (PD). With colder winter temperatures, the bacteria that causes PD, Xylella fastidiosa, can actually be “cured” from the vine. With warmer temperatures, the bacteria survives and kills infected plants. In the past, elevations …

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