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Dosage Response of Armillaria mellea to Methyl Bromide. Donald E. Munnecke, Professor, Department of Plant Pathology, University of California, Riverside 92502; W. D. Wilbur(2), and M. J. Kolbezen(3). (2)(3)Laboratory Technician IV, and Chemist, respectively, Department of Plant Pathology, University of California, Riverside 92502. Phytopathology 60:992-993. Accepted for publication 27 January 1970. DOI: 10.1094/Phyto-60-992.

Citrus root pieces artificially infested with Armillaria mellea were subjected to several doses of methyl bromide gas for various periods of time, aerated, and buried in nonsterile soil for 21 days. After storage, the inoculum pieces were sampled for viability of A. mellea by plating-out chips taken from the roots on agar medium. The ld₉₅ values were determined for various conditions and fitted to a standard curve. The ld₉₅ values ranged from 1.6 days at 3,000 ppm methyl bromide in air to 9.5 days at 500 ppm.