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Enhanced IPM of Rose Stem Girdler, an Emerging Pest of Pacific Northwest Caneberries

Rose stem girdler (RSG) is an invasive beetle pest of caneberry crops that is becoming increasingly problematic for Pacific Northwest (PNW) growers. It has progressively become naturalized throughout the northern Willamette Valley northward to the south Puget Sound region throughout the 2000s-present due to abundant wild bramble hosts. Grower reports of damage to crops has been variable, but with incidental claims of up to ~70% crop loss in a given year due to cane girdling by the beetle’s larvae. Control has been difficult and inefficient due to narrow windows of time for effective control (after adults emerge from canes, but before egg-laying begins 7 days later), and the lack of region-specific information to predict emergence and longevity of egg-laying activity. Our project objectives were: 1) to refine determinants of risk to PNW caneberry plantings from RSG through coordinated regional pest surveys, 2) to develop an enhanced integrated pest management (IPM) program with refined information on RSG detection methods, life cycle, and development of a pest management prediction model, and 3) to investigate biocontrol potential of a parasitoid wasp that may mitigate RSG’s viability and play a role in future IPM programs.

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New Opportunities for Control of Bindweed in Blackberries

The objectives of this project were to determine: 1) whether the herbicide Quinclorac can be used to control or suppress bindweed in blackberries without impacting crop performance; and 2) whether a biological control of bindweed, the gall-forming mite Aceria malherbae, can be established in berry fields and used in concert with herbicides to enhance bindweed control. Quinclorac was applied 30 days before harvest, after harvest, and near the first frost in the fall to both EY and AY blackberries, raspberries, and blackberry and raspberry transplants. Quinclorac provided 80 to 90% control of bindweed and did not harm caneberries.

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Investigation of Potential Climatic and Nutritional Causes of Grape Chlorosis

Nitrogen levels in grape must that are either too high or too low can cause sensory and economic issues in the production of fine wine. The amount of available nitrogen during fermentation is key to the healthy formation and reproduction of yeast, and completion of the process to dryness. The major yeast strain that dominates healthy alcoholic fermentation, Saccharomyces cerevisiae, typically produces one molecule of urea, glutamate, and proline from the metabolism of the amino arginine.

Continue ReadingInvestigation of Potential Climatic and Nutritional Causes of Grape Chlorosis