OSU: I live in Beaverton, OR, but tying to help my mom who lives in Eastern WA with her raspberries in Pullman, WA. There seems to be this yellowing color which is making leaves die. Does not appear on all leaves, and not wide spread throughout plantings. I do not suspect nitrogen deficiency, but could be lack of some other nutrient. I thought it might be some virus, but i do not know. The raspberries are an old variety, and are not ever bearing. Soil is clayish, not over watered. I realize this is topic in eastern WA, but I live in Oregon, so thought you may help my mom for me. Thanks, Chris
Whitman County Washington
Thank you for your question, Chris. Most of the research and available Extension literature from OSU concerns berry production in the Willamette Valley, not Central or Eastern Oregon. So, her own county Extension office can probably provide more localized advice. However, yellowing of leaves is typically caused by overwatering and/or under-fertilizing, which results in chlorosis (lack of nitrogen causing yellowing) and subsequent leaf death. However, I am unable to identify the brown spots on the leaves, as differentiated from the leaf edge necrosis. It could be a pathogen (fungi, bacteria, etc.). Here is a comprehensive berry publication specifically for crops east of the Cascades that might be helpful: https://www.extension.uidaho.edu/publishing/pdf/BUL/BUL0812.pdf I would still recommend that you or she contact her county Extension office for further information. This webpage lists offices by county: http://pubs.cahnrs.wsu.edu/locations/ Good luck!