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Thursday, October 18, 2018

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Search results on 10/18/18

1327. Claudius, G.R. and R.S. Mehrotra. 1973. Root exudates from lentil seedlings in relation to wilt disease.. Plant Soil 38:315-320.
Lentils at 21 day age had root exudates that contained glycine and phenylalanine, which inhibited the germination of spores of Fusarium oxysporum f. lentils; there was less disease incidence when plants were older than 21 days and inoculated with the pathogen. T: fungal growth.

241. Allmaras, R.R., J.M. Kraft and J.L. Pikul, Jr.. 1987. Lime and gypsum effects on pea-root-pathogen inoculum and related factors in a wheat-peas rotation.. Agron. J., 79(3):439-445.
Root-disease responses to manageable soil chemical factors, such as pH or Ca saturation, can be an effective biological control strategy. In a wheat-pea rotation, a single application of lime, to ad just pH of a Walla Walla silt loam from 5.5 to 6.2, produced less growth in peas than in wheat - a response inconsistent with greater legume responses to liming. Reduced propagule numbers in the top 0.15m of soil may not have reduced root disease because propagules of F. solani f. sp. pisi were abundant in the 0.15-0.45m layer, which had a pH of 5.7 and showed only a negligible increase of Ca saturation. T: Soil pH responses several years after lime or gypsum application to a Walla Walla silt loam in a wheat-peas rotation. Summary of analysis of variance of propaguledensity, measured in the 0-0.15m depth. Time trends of propagule density in the 0 -0.15m layer of wheat-pea rotation on a Walla Walla silt loam as related to lime and gypsum treatments. etc.

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

7290. Vlitos, A.J. and D.A. Preston. 1949. Seed treatment of field legumes.. Phytopathology, 93(9):706-714.
Alfalfa seed treated with Phygon at 1.00, 0.50 and 0.25% dosages by weight of seed gave high significant germination as compared with nontreated seed. Arasan at 1.00 %, Dow 9B and 1.00 %, and Spergon and 0.50% dosage rates were all superior to nontreatment, but less effective than Phygon. Nodulation was not inhibited by chemical treatment of seed alfalfa, mungbean, yellow hop clover, Chinese red cowpea, hairy vetch, and Austrian winter pea, when chemical treatment was followed by seed inoculation with "Nitragin" bacterial inoculum. Nodulation of Chinese red cowpea was enhanced if seed of these legumes were treated with Phygon or Arasan and then inoculated with "Nitrigin". Chemically treated seed yielded more plants with nodules than nontreated seed. T: effect of seed treatments on alfalfa germination. Compatability of seed treatment and inoculation with nodule bacteria, and the effect on nodulation, in alfalfa and cowpea.

7524. White, J.G.H.. undated. Grain legumes in sustainable cropping systems; a review.. unpublished manuscript, Plant Science Dept..
This paper briefly reviews the role that grain legumes can play in sustaining cropping systems. It presents various estimates of N fixation of grain legumes, with lupin and fababean showing the highest rates, followed by peas and lentils, chickpeas, and soybeans. Phaseolus beans are generally poor N fixers. Fababeans are more tolerant of soil mineral N than other species and will still fix large quantities of N when mineral N is present. Under drought stressed conditions, peas and lentils were more efficient in N fixation than fababeans. Only in lupins and fababeans was N fixation normally greater than the N removed in the seed. The roots and nodules of grain legumes are likely to be the greatest source of N for following crops. This N is often quickly mineralized within several weeks after harvest, and strategies are needed to prevent its loss. Grain legumes are also beneficial break crops, particularly for soil-borne diseases, and can help to control certain grassy weeds. Preceding grain legumes with a brassica crop has reduced the incidence of Aphanomyces root rot in peas, due to sulfur containing compounds. Most grain legumes suffer reduced yields if soils are compacted and poorly aerated. The paper contains numerous references and tables on nitrogen relations.

7570. Wilkins, D.E. and J.M. Kraft. 1987. Crop residue management and pea root rot disease.. Am. Soc. Agric. Engrs., Paper No. 87-2510.
The objectives of this research were to determine the influence of placement of crop residue on the distribution and concentration of P. ultimum and F. solani f. sp pisi propagules and the associated impact of these root rot diseases on pea growth. Results suggest that conservation tillage which utilizes crop residue on and near the soil surface for erosion control can be used in areas like northeastern Oregon and southeastern Washington with cold and dry spring weather for fresh pea production and not expect serious increases in root rot diseases over clean till methods. T: Pea response to residue management.

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.

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