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Hot-Water Therapy for Geranium Rust Control. Douglas J. Phillips, Plant Pathologist, ARS, USDA, 2021 South Peach Avenue, Fresno, California 93727; Arthur H. McCain, Extension Plant Pathologist, Department of Plant Pathology, University of California, Berkeley 94720. Phytopathology 63:273-275. Accepted for publication 30 August 1972. DOI: 10.1094/Phyto-63-273.

Rust incited by Puccinia pelargonii-zonalis did not develop on infected geranium cuttings, Pelargonium hortorumP. zonale), after they were dipped for 90 sec in water at 50 or 52 C, or were held 24 or 48 hr in water-saturated air at 38 C. The hot-water treatment permitted germination of some urediospores, particularly those taken from poorly growing plants. Hot water damaged small expanding leaves, but did not retard subsequent plant growth.

Additional keywords: thermotherapy.