This paper was presented at the MPU/EPPO Conference on Phytophthora … The commonest species, a … Field Resistance of Red Raspberry Varieties to Phytophthora Root Rot. Since most strawberries in Michigan are grown on light soils, red stele of strawberries (Phytophthora fragariae) is a relatively rare root disease, but it occurs occasionally in heavier soils. Phytophthora root rot, caused by Phytophthora fragariae van rubi, has become a major problem in raspberry growing also in Switzerland.Häberli Obst- und Beerenzentrum AG, a private nursery company, with its own breeding programmes in small fruits since 1983, has begun a programme with special respect to Phytophthora resistance in raspberries in 1989. Phytophthora root rot caused by Phytophthora rubi ((Wilcox & Duncan) Man in’t Veld) is a disease that limits the production and longevity of raspberry fields throughout the world. More information: Phytophthora Root Rot of Raspberry – (Ohio State University) Notes on Raspberry Diseases: Phytophthora Root Rot-(OMAFRA) Phytophthora Root Rot of Caneberries-(University of California) Use these resources if you need additional help with diagnosis and to find solutions to your problem. The root rot can be caused by a number of species of the soil-borne fungi Phytophthora. Apply 5 lbs./1,000 ft. of row to the soil surface in a 3-foot band over the row (72.5 lbs./A on a broadcast basis). Maloney KE, Pritts M, Wilcox WF, Kelly MJ, 2005. Abstract Phytophthora root rot caused by Phytophthora rubi ((Wilcox & Duncan) Man in’t Veld) is a disease that limits the production and longevity of raspberry fields throughout the world. Phytophthora Root Rot (Phytophthora spp.) Avoid growing susceptible varieties, especially in heavier soil types or on soils prone to floods. My newly planted Meeker raspberries developed root rot late this spring so I pulled them out. Root rot caused by oomycetes is not very common in Michigan but should be considered if blueberries are declining or dying in poorly drained soils or areas with standing water for several days. The use of woven weed cloth and black plastic mulch may also increase conditions for Pythium or Phytophthora root rot. Although plants in the +PFR field did not 1998). It mostly occurs in heavy soils, where standing water occurs, or where plants have been heavily mulched. Phytophthora root rot, caused by Phytophthora fragariae var.rubi, has become a major problem in raspberry growing also in Switzerland.Häberli Obst- und Beerenzentrum AG, a private nursery company, with its own breeding programmes in small fruits since 1983, has begun a programme with special respect to Phytophthora resistance in raspberries in 1989. Symptoms include a general lack of vigor and a sparse plant stand. resistance to Phytophthora caused diseases, and indicates that recurrent selection is the appropriate approach for the development of new resistant cultivars. These two studies have been carried out on our commercial field of 'Meeker' that was established in 1997 on raised beds with drip irrigation. The incidence and economic importance in Europe of red core root rot of strawberries (P. fragariae), leather rot of strawberry fruits and crown rot (P. cactorum) and root rot of raspberries (usually associated with P. megasperma and P. cambivora) are discussed. rubi) (+PFR) and uninfested field (-PFR) planted to 'Heritage' red raspberries. were isolated from raspberries from several locations in the UK. Some Phytophthora root rot symptoms have already been seen in raspberries in Michigan. Phytophthora Root Rot on Red Raspberries. 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