Oregon State University just released their 2019 updated hazelnut pest management guide for growers in the Willamette Valley, including pesticide and fungicide use guidelines (products, rates and application timing).
The chemicals, formulations, and rates listed for insect, mite, and disease control are among the best recommendations based on label directions, research, and orchard use experience. Only a thorough knowledge of the orchard, cultivar, tree size and density, canopy characteristics, pest complex, and past pest problems will enable you to correctly select chemicals, rates, water volume, and method of application for optimum pest control. Occasionally, different formulations of a product or like formulations containing a different amount of active ingredient also are registered and effective for use on the pests listed. These products also may be used; we do not intend to discriminate against them. You may wish to consult their labels and determine whether their use confers advantages over the products listed in this guide.
Always refer to the pesticide label as the legal document guiding product use. Two questions frequently asked about chemical control of insects and diseases are: “How much chemical do I use per acre?” and “What is the least amount of water I need to apply per acre?” The tables below suggests an amount of formulated product (not active ingredient [AI]) to use per acre. This amount is based on a “typical” middle-aged and density orchard with moderate pest pressure. It takes less spray to get good coverage on an orchard with immature trees with limited canopy, but this does not affect the rate of application by volume. For most ground-applied applications, apply products in a minimum of 100 gallons of water per acre (GPA). For larger canopies, 150 to 200 GPA of water can improve coverage and efficacy. Always calibrate sprayers to tree size to improve coverage, reduce waste, and avoid drift. Please be aware of recent regulations governing the application of pesticides outlined
in the EPA Worker Protection Standard (WPS), particularly the Application Exclusion Zone (AEZ), which is enforced by Oregon OSHA. Apply pesticides judiciously and promote good relationships with neighbors. Read more Here.