Factors that affect deep penetration of field soils by methyl bromide
AuthorsM. J. Kolbezen
D. E. Munnecke
W. D. Wilbur
L. H. Stolzy
F. J. Abu-El-Haj
T. E. Szuszkiewicz
Authors AffiliationsM. J. Kolbezen was Lecturer in the Department of Plant Pathology and Chemist in the Experiment Station, Riverside; D. E. Munnecke was Professor of Plant Pathology and Plant Pathologist in the Experiment Station, Riverside; W. D. Wilbur was Staff Research Associate, Department of Plant Pathology, Experiment Station, Riverside; L. H. Stolzy was Professor of Soil Science and Soil Physicist in the Experiment Station, Riverside; F. J. Abu-El-Haj was Staff Research Associate, Department of Plant Pathology, Experiment Station, Riverside; T. E. Szuszkiewicz was Staff Research Associate, Department of Soil Science and Agricultural Engineering, Experiment Station, Riverside.
Hilgardia 42(14):465-492. DOI:10.3733/hilg.v42n14p465. November 1974.
Effective control of the root rot fungus, Armillaria mellea, with methyl bromide requires diffusion of adequate dosages to depths as deep as the roots of the dead and diseased plants. Factors that govern diffusion to these depths are soil texture, porosity as it relates to moisture, amount and method of application, and the soil covers used. Diffusion patterns were determined by gas chromatographic analysis of soil atmospheres. A crop of sudangrass dried the soils sufficiently in one season to depths of 8 feet to enable methyl bromide to diffuse readily. Best downward movement was obtained by placing methyl bromide about 3 feet deep; downward movement was greater than lateral, and adequate dosages were obtained 10 to 12 feet deep. Increased dosage increased the range of effective fumigation. A plastic cover was required to give control at the surface and top 1 foot of soil. Polyethylene is a relatively poor cover compared to other plastics. The soils studied were coarse sandy Ioams and the fine-textured silt and sandy clay loams. Some results of these studies have been applied to commercial fumigations.
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