WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Sunday, April 22, 2018

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8858. Chan, M.K. and R.C. Close. 1987. Aphanomyces root rot of peas. 3. Control by the use of cruciferous amendments.. New Zealand J. Agr. Res. 30:225-233.
Growing Brassica napus in Aphanomyces euteiches infested soils for four months reduced the disease severity index (DSI) from 25-50% in three soils tested. There was no reduction in control soils with no plants, wheat, or red clover. Incorporation of dry leaves and stems of five cruciferous species also reduced DSI and oospore numbers. Reductions were greater after 6 weeks than after 3 weeks. Some species were more effective than others - Brassica napus was particularly good.

10516. Short, R.. 1991. Common root rot of peas incited by Aphanomyces euteiches.. handout at Crops 510 seminar, WSU.
Aphanomyces euteiches is often the primary and dominant invading species of a pathogen complex that attacks peas, along with Fusarium, Pythium, Rhizoctonia, and Ascochyta. Aphanomyces causes 16-20 million dollars of crop loss annually in the U.S. The oospores may persist in soil for more than 20 years, making it a difficult disease to eliminate. Control of Aphanomyces demands and integrated approach due to its invasive and pervasive nature. Field sampling can help determine inoculum levels, and crop sequences can be altered. In some cases, a break of five or more years between pea crops is needed to lower inoculum levels for minimal damage. Cultural practices which reduce soil compaction and promote drainage are beneficial. Organic amendments such as crucifer green manure crops have reduced inoculum levels in infested soils. Biological control agents, such as Trichoderma and Pseudomonas, show promise. Breeding for multiple disease resistance is another important strategy.

10616. Anderson, D.. undated. Mustard, bacteria provide natural control of pea root rot.. Center for Integrated Agricultural Systems newsletter, Univ. Wisconsin, Madison..
Processing peas, a major Wisconsin crop, suffer up to 15% yield loss due to diseases which can remain in the soil for up to 10 years. There is no good control for pea root rot at present. Researchers are testing green manure plowdowns as a possible control, using white mustard. Also, pea seeds are being coated with fungi-fighting bacteria before planting.

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