Experiments in the control of Rhizoctonia damping-off of citrus seedlings
H. S. Fawcett
Authors AffiliationsR. Weindling was Technical Assistant in Plant Pathology, Citrus Experiment Station; resigned June 30, 1935; H. S. Fawcett was Professor of Plant Pathology in the Citrus Experiment Station and Graduate School of Tropical Agriculture and Plant Pathologist in the Experiment Station.
Hilgardia 10(1):1-16. DOI:10.3733/hilg.v10n01p001. January 1936.
Abstract does not appear. First page follows.
Rhizoctonia solani Kuhn has been reported from various localities as the most important fungus associated with the damping-off disease of citrus seedlings.(5), (19), (20), (21), (25) During the last four years this fungus has been constantly isolated from diseased seedlings of sweet orange, grapefruit, and sour orange which were collected in seed beds from various sections of southern California. In the present experiments, the high virulence of the pathogen in sterilized and natural soils has been repeatedly verified. There is an indication from field and greenhouse observations that sour orange is not quite so susceptible to the attack of the fungus as sweet orange.
The disease is readily recognized in the seed bed. The dead seedlings with withered leaves usually remain standing about the margins of the bare areas which mark the centers of infection. At the margins of these areas may be found plants with lesions and apparently healthy seedlings with strands of the fungus hanging like spider webs around the base of the stem. In general, nurserymen are able to avoid damping-off or to keep it within reasonable limits by good cultural practices, such as are discussed by Fawcett and Lee.(5) In some seasons and in some sections, however, the losses due to damping-off have been excessive. In 1934, for instance, 50 to 60 per cent of the seedlings in some beds were affected.
 Alexander L. J., Young H. C., Kiger C. M. The causes and control of damping-off of tomato seedlings. Ohio Agr. Exp. Sta. Bul. 1931. 496:1-38.
 Allen M. C., Haenseler C. M. Antagonistic action of Trichoderma on Rhizoctonia and other soil fungi. Phytopathology. 1935. 25:244-252.
 Bisby G. R., James N., Timonin M. Fungi isolated from Manitoba soil by the plate method. Canada Jour. Research. 1933. 8:253-275.
 Endo S. Studies on the antagonism of microörganisms. II. Growth of Hypochnus sasakii Shirai as influenced by the antagonistic action of other microörganisms. Bul. Miyazaki Col. Agr. and For. 1932. 4:133-158.
 Fawcett H. S., Lee H. A. Citrus diseases and their control 1926. p.582. (See specifically p. 64.) McGraw-Hill Co., New York
 Fellows H. Studies of certain soil phases of the wheat take-all problem [Abstract.]. Phytopathology. 1929. 19:103
 Garrett S. D. Factors affecting the severity of take-all. I. The importance of soil microorganisms. Jour. Dept. Agr. So. Australia. 1934. 37:664-674.
 Girton R. E. The growth of citrus seedlings as influenced by environmental factors. Univ. Calif. Pubs., Agr. Sci. 1927. 5:83-117.
 Gratz L. O. Wire stem of cabbage. New York (Cornell) Agr. Exp. Sta. Mem. 1925. 85:1-60.
 Hartley C. Damping-off in forest nurseries. U. S. Dept. Agr. Dept. Bul. 1921. 934:1-99.
 Hartley C., Merrill T. C., Rhoads A. S. Seedling diseases of conifers. Jour. Agr. Research. 1918. 15:521-558.
 Henry A. W. The natural microflora of the soil in relation to the foot rot problem of wheat. Canada Jour. Research. 1931. 4:69-77.
 Hissink D. I. International society of soil science. Report of the committee on soil reaction measurements. Soil Research. 1930. 2:77-152.
 Jackson L. W. R. Effect of sulphuric acid and aluminum sulphate as used for the control of damping-off of conifers on soil pH [Abstract.]. Phytopathology. 1933. 23:18
 Jensen H. L. The fungus flora of the soil. Soil Sci. 1931. 31:123-158.
 Jones L. R., Johnson J., Dickson J. G. Wisconsin studies upon the relation of soil temperature to plant disease. Wisconsin Agr. Exp. Sta. Research Bul. 1926. 71:1-144.
 McLennan E. The growth of fungi in soil. Ann. Appl. Biol. 1928. 15:95-109.
 Moritz O. Weitere Studien über die Ophiobolose des Weizens. Arb. Biol. Reichsanst. Land und Forstw. 1932. 20:27-48.
 Petri L. Rassegna dei casi fitopatologice-osservati nel 1931. Bol. R. Staz. Pat. Veg., N. S. 1932. 12:1-64.
 Reichert I., Perlberger J. Observation and investigation of seed bed diseases of citrus trees in Palestine. Yedeoth, Proc. Zion. Agr. Exp. Sta. 1928. 9:452-454.
 Rhoads A. S., DeBusk E. F. Diseases of citrus in Florida. Florida Agr. Exp. Sta. Bul. 1931. 229:1-211. (See specifically p. 107)
 Roth C. Untersuchungen über den Wurzelbrand der Fichte (Picea excelsa Link. Phytopath. Zeitschr. 1935. 8:1-110.
 Samuel G., Garrett S. D. Rhizoctonia solani on cereals in South Australia. Phytopathology. 1932. 22:827-836.
 Sanford G. B., Broadfoot W. C. Studies of the effect of other soil inhabiting microörganisms on the virulence of Ophiobolus graminis Sacc. Sci. Agr. 1931. 9:512-528.
 Smith R. E., Smith E. H. California plant diseases. California Agr. Exp. Sta. Bul. 1911. 218:1038-1193. (See specifically p. 1141.) (Out of print.) http://www.archive.org/details/californiaplantd218smit
 Thom Charles, Humfeld H. Notes on the association of microörganisms and roots. Soil Sci. 1932. 34:29-35.
 Waksman S. A. Principles of soil microbiology. 1932. Baltimore: The Williams and Wilkins Co. 893p.
 Weindling R. Trichoderma lignorum as a parasite of other soil fungi. Phytopathology. 1932. 22:837-845.
 Weindling R. Studies on a lethal principle effective in the parasitic action of Trichoderma lignorum on Rhizoctonia solani and other soil fungi. Phytopathology. 1934. 24:1153-1179.
 Weindling R. Various fungi recently found to be parasitic on Rhizoctonia solani [Abstract.]. Phytopathology. 1934. 24:1141
 Weindling R., Fawcett H. S. Experiments in biological control of Rhizoctonia damping-off [Abstract.]. Phytopathology. 1934. 24:1142
 Wiant J. S. The Rhizoctonia damping-off of conifers and its control by chemical treatment of the soil. New York (Cornell) Agr. Exp. Sta. Mem. 1929. 124:1-64.
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