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Research Article

Blue-green mold on citrus: Ammonia gas used in citrus packing plants as fumigant for control of blue-green mold on Valencias, navels and lemons


C. N. Roistacher, University of California
L. J. Klotz, University of California
I. L. Eaks, University of California

publication information

California Agriculture 11(10):11-12. October 1957.

author affiliations

C. N. Roistacher is Principal Laborator, Technician in Plant Pathology, University of California, Riverside. L. J. Klotz is Professor of Plant Pathology, University of California, Riverside. I. L. Eaks is Assistant Plant Physiologist in Plant Biochemistry, University of California, Riverside.


Abstract Not Available – First paragraph follows:

Laboratory experiments with anhydrous ammonia—for the control of blue-green decay in injured-inoculated fruit—developed a treatment that provided excellent protection for oranges and lemons. However, tests also revealed that the gas must be applied within the first 24-30-hour storage period to be effective, because at 68°F the green mold—Penicillium digitatum—will penetrate approximately one millimeter into the rind, beyond reach of the chemical. Therefore, fruit injured in picking, dumping and loading must be treated promptly to avoid infection.

author notes

The above progress report is based on Research Project No. 808.