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Effective control of the root rot fungus, Armillaria mel/ea, 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 sufliciently in one season todoi:10.3733/hilg.v42n14p465 fatcat:qt3vrv5vwfbcngp5pldbrgack4