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Relationship between magnesium content of alfalfa medicago sativa and stemphylium botryosum leaf spot severity

, : Relationship between magnesium content of alfalfa medicago sativa and stemphylium botryosum leaf spot severity. Plant Disease Reporter 63(9): 741-743

The severity of Stemphylium leafspot was compared in the greenhouse on alfalfa with a Mg content of 0.12-2.00%. Disease severity was significantly and negatively correlated with Mg content, and defoliation was greater in diseased plants at lower levels of Mg. Mg levels exceeding 0.5% reduced disease severity, but at Mg levels of 0.12-0.40%, which are comparable to those of field-grown alfalfa, plants were susceptible to Stemphylium leafspot. It is unlikely that the severity of this disease in the field will be modified greatly by Mg fertilization practices.

Accession: 006297558

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Related references

Cowling W.A.; Gilchrist D.G., 1980: Influence of the pathogen on disease severity in stemphylium botryosum leaf spot of alfalfa medicago sativa in california usa. Disease severity in Stemphylium leafspot of alfalfa (M. sativa) in California was assessed on a cloned a alfalfa genotype at different levels of pathogen relative virulence and inoculum concentration. Measurements of disease severity, defined as p...

Focke, I.; Focke, R., 1969: The effect of common leaf spot (Pseudopeziza medicaginis (Lib.) Sacc.) and leaf spot (Stemphylium botryosum Wallr.; Phoma medicaginis Malbr. et Roum.) on the CO2 assimilation by the leaves of alfalfa (Medicago sativa L.). Zentralblatt für Bakteriologie, Parasitenkunde, Infektionskrankheiten und Hygiene. Zweite Naturwissenschaftliche Abt.: Allgemeine, Landwirtschaftliche und Technische Mikrobiologie 123(7): 766-770

Focke, I.F.cke, R., 1969: The effect of Pseudopeziza medicaginis (Lib.) Sacc. leaf spot, and Stemphylium botryosum Wallr. and Phoma medicaginis Malbr. et Roum. brown spot on the carbon dioxide assimilation in alfalfa (Medicago sativa L.) leaves

Cowling W.A.; Gilchrist D.G., 1982: Effect of light and moisture on severity of stemphylium leaf spot of alfalfa medicago sativa. The effect of various light sequences and moisture periods on severity of Stemphylium leaf spot was tested in a controlled environment chamber on a susceptible alfalfa clone inoculated with the cool-temperature biotype of Stemphylium botryosum. Pl...

Higgins V.J.; Millar R.L., 1968: Phyto alexin production by alfalfa d in response to infection by colletotrichum phomoides helminthosporium turcium stemphylium loti and stemphylium botryosum medicago sativa d. Phytopathology 58(10): 1377-1383

Cowling W.A.; Gilchrist D.G.; Graham J.H., 1981: Biotypes of stemphylium botryosum on alfalfa medicago sativa in north america. Field symptoms of Stemphylium leafspot of alfalfa differ in California [USA] and in eastern North America (including southern Canada and northern USA). Characteristic symptoms of the 2 forms of the disease were reproduced when susceptible alfalfa...

Teuber L.R.; Gilchrist D.G.; Martensen A.N.; Cowling W.A.; Bohling S.; Green W.L., 1983: Uc 1249 and uc 1250 stemphylium leaf spot resistant alfalfa medicago sativa germ plasm. Crop Science 23(4): 805

Cowling W.A.; Gilchrist D.G., 1982: Expression of pathogen virulence and host resistance during infection of alfalfa medicago sativa with stemphylium botryosum. Infection of M. sativa by S. botryosum (cool temperature biotype) was examined histologically to assess the sequence and form in which pathogen virulence and host resistance were expressed. Pathogen growth during the infection process and host rea...

Gilchrist D.G.; Teuber L.R.; Martensen A.N.; Cowling W.A., 1982: Progress in selecting for resistance to stemphylium botryosum cool temperature biotype in alfalfa medicago sativa. Plants from 7 alfalfa, M. sativa L., cultivars [LEW, Lahontan, CUF 101, UC Cargo, Moapa 69, SW-44 and Saranac] were inoculated with the cool-temperature biotype of S. botryosum Wallr. in a controlled environment chamber to identify plants resistan...

Lucas L.T.; Busbice T.H.; Chamblee D.S., 1973: Resistance to stemphylium botryosum leaf spot in new alfalfa cultivar. Plant Disease Reporter 57(11): 946-948