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Pest/Disease Management

Alternaria Management in Pistachio (As Summarized in Pacific Nut Producer Magazine June Orchard Tasks)

By the time you will read this article, pistachio nuts have almost completed 80% of the final size and their ovary is still small getting ready to start increasing its size to completion by the end of July. June is considered still too early to start seen early-split (ES) nuts. These will start showing in the second part of July …

What Nut Growers Can Do to Combat the New Carpophilus Pest

It seems we are always on the verge of some type of apocalypse, and with the new carpophilus beetle invading California tree nut orchards, there is cause for concern.  Watch this brief California Ag Network interview with UC Riverside CE Entomology Specialist Houston Wilson to learn more about this pest and how to stop it from damaging your crops.

New Research Reveals Hazelnut Growers are Missing the Mark on Filbertworm Control

New research at Oregon State University (OSU) suggests that filbertworm, the #1 insect pest of the hazelnut industry, is causing a lot more early season damage than growers have detected or attributed in the past. At a recent Nut Growers Society meeting, Pacific Nut Producer Editor Matthew Malcolm met with OSU hazelnut extension experts Nik Wiman and Betsey Miller to …

Nut Growers Society President Addresses New Eastern Filbert Blight Crisis

In addition to good news of higher prices and a new hazelnut variety release from Oregon State University, hazelnut growers in attendance at the Nut Growers Society Winter Meeting were also discussing and expressing much concern over a new strain of Eastern Filbert Blight (EFB). Now spreading around the Willamette Valley of Oregon, this new strain appears to be no …

Efficacy of a Hull Split Spray vs. Sanitation for NOW Control

Navel orangeworm (NOW) is most effectively controlled with the cultural practice of winter sanitation. Winter shaking almond trees to remove mummy nuts has proven to decrease next year’s NOW damage better than any other approach. The reason for this is clear. NOW overwinters as larvae in mummy nuts left in the tree after harvest and it is in these nuts the population …

Preventing Bacterial Blast Damage in Almond This Year

In 2023, the cold, wet weather during bloom and leaf-out resulted in bacterial blast damage in many Sacramento Valley almond orchards. If conditions this year are cold and wet during bloom, we may see a recurrence of blast: make a plan now to keep blast damage to a minimum. The Bottom Line: Bacterial blast can be a problem when cold, wet conditions …

EPA Approves Section 18 Emergency Registration for Kasugamycin on Almonds

The Environmental Protection Agency (EPA) and California Department of Pesticide Regulation recently accepted a Section 18 petition to allow the use of Kasumin 2L (kasugamycin) to control bacterial blast (Pseudomonas sp) in almonds. The registration allows up to two applications under anticipated cold or freezing conditions on almonds at a use rate of 64 fl. oz. per acre from February 2, 2024, through petal fall. Application …

Defending Your Orchard From the Risk of Fungicide Resistance

– SPONSORED CONTENT – Every orchard 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 risk to efficacy. Growers are often unaware they have a fungicide resistance issue until devastating diseases like blossom blight/brown rot, jacket rot and hull rot have caused …

Treatment Options for Management of Walnut Scale and Frosted Scale

Walnut scale (Figure 1) is an important economic pest of walnuts in California. High populations of walnut scale may affect tree vigor as well as predispose trees to diseases caused by several plant pathogenic fungi and possibly flatheaded borer damage. Historic UC Pest Management Guidelines emphasize the efficacy of insecticide applications at the crawler stage of insect development (late April …

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 …

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