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Organic & Integrated Tree Fruit Production

Sunday, January 21, 2018

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Search results on 01/21/18

1540. Davis, J.B.. 1988. Winter rapeseed (Brassica napus) with differential levels of glucosinolates evaluated to suppress Aphanomyces root rot.. M.S. Thesis.
Winter rapeseed (Brassica napus) with differential levels of glucosinolates were evaluated as a green manure crop to suppress Aphanomyces root rot of peas.

3679. Knight, G.K.. 1944. Pea diseases in Idaho.. ID Agr. Expt. Sta. Bull #253.
Lists the various diseases, has photos; crop rotation of 3-4 years is optimum for control. T: photos of diseases

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.

10643. Muehlchen, A.M. and J.L. Parke. 1990. Evaluation of crucifer green manures for controlling Aphanomyces root rot of peas.. Plant Disease 74:651-654.
Crucifers have been shown to limit the activity of several soil-borne pathogens, including Rhizoctonia, Thielaviopsis, Fusarium, and Aphanomyces. Researchers think that sulfur compounds released during decomposition are responsible. Aphanomyces reduces pea yields 10%, but also affects beans and alfalfa. In this study, Aphanomyces root rot was lowerd by a white mustard green manure, but pea yields did not improve signficantly until the end of the second year, when pea yields increased 20% over fallow plots.

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