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Brown pustules (uredinia) are apparent on the lower leaf surfaces and are surrounded by a chlorotic halo. Subsequent outbreaks of rust may give the pustules a circular pattern or sets as concentric rings. Photograph courtesy of Dr. K.R. Summy, UTPA.
Dr. Christopher R. Little
Department of Biology, The University of Texas - Pan American, Edinburg, TX 78541-2999.
crlittle@panam.edu
Host: Antirrhinum majus; Snapdragon
Disease name: Snapdragon rust
Pathogen name: Puccinia antirrhini
Control of snapdragon rust is dependent upon proper spacing of plants to ensure adequate aeration between foliage and reduced periods of leaf wetness. Temperatures of 60 - 70 degrees F appear to favor rust development. Urediniospores may be spread from plant to plant by insects so control of pests is recommended. Rust resistant varieties are available.
APS publication number: IW000036
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