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Pest/Disease Management

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 …

New Invasive Pest Threatens Western Tree Nut Industry

Western tree nut commodities just got through a very tough season, and markets are still less than ideal.  The last thing growers want to hear about is a new pest threatening their orchard production.  But the Carpophilus Beetle has already been under the radar far too long, damaging Central Valley orchards under the guise of “Navel Orangeworm.”  Watch this brief video with …

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 …

Increasing Presence and Damage of Brown Marmorated Stink Bug in Oregon Hazelnuts

While hazelnut growers have been dealing with higher input costs and less than ideal nut prices, they cannot afford to cut costs on their pest monitoring and management practices.  An invasive pest, known as brown marmorated stink bug has taken a particular fondness of hazelnuts and is spreading across most of the major hazelnut growing regions of Oregon.  Watch this …

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