Factors that affect deep penetration of field soils by methyl bromide

M. J. Kolbezen, D. E. Munnecke, W. D. Wilbur, L. H. Stolzy, F. J. Abu-El-Haj, T. E. Szuszkiewicz
1974 Hilgardia  
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 to
more » ... epths 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 looms. Some results of these studies have been applied to commercial fumigations.
doi:10.3733/hilg.v42n14p465 fatcat:qt3vrv5vwfbcngp5pldbrgack4