Like many rust diseases, G. sabinae requires two different hosts to complete its life cycle from year to year. Juniper is the winter host and pear is the most. Gymnosporangium sabinae: spermogonia on Pyrus pyraster. detail. Gymnosporangium sabinae: spermogonia on Pyrus pyraster. the underside of the leaf is. Spermogonia and aecia of G. sabinae on pear leaves. Tumefaction of infected branches by Gymnosporangium sabinae on alternative host plant Juniperus.
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Overwintering of pear trellis rust in pear. More information about modern web browsers can be found at http: The following page uses this file: The article was very helpful and included photographs of the gall on Pear, caused by the fungus Gymnosporangium sabinae.
Hypertrophied plant tissue was evident on the abaxial surface below the spermagonia, but aecia were absent. Thereafter, the fungus was collected on Callery pear in northern Washington in and recently, in Michigan in 4. Journal of Plant Pathology, 94 4, Supplement: Generate a print friendly version containing only the sections you need. As summer continued, brown, gall-like outgrowths developed on the lower gymnosporngium surfaces below the orange patches.
Plant Disease, 93 8: Searching for Gymnosporangium sabinae has yielded more information on the RHS website. Spermogonia and aecia of G. European and Mediterranean Plant Protection Organization. Register new name species, genus, family, etc Register new type specimen of existing taxa epitype, neotype, etc. CMI, ; Habib et al.
Schweizerische Zeitschrift fur Obst- und Weinbau, Taxonomic studies on Gymnosporangium in China.
Pear Rust, Gymnosporangium sabinae (aka Pear Juniper Rust or Pear Leaf Gall)
Don’t need the entire report? A Revised Taxonomic Account of Gymnosporangium.
These cookies allow us to see information on user website activities including, but not limited to page views, source and time spent on a website. Wikipedia also has some good pictures on both hosts.
Gymnosporangium fuscum (European pear rust)
Rust [caused by Gymnosporangium fuscum] of pears and juniper [Juniperus]: I have since found that my plant pests and diseases book has an entry for the related Hawthorn Rust, G. Good Plant Protection Practice for pome fruits. The fungus overwinters on Juniper, where it forms a perennial infection on the stem.
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It is not a great cropper, with only a couple of fruit each year, though it is very beautiful in spring, when it is covered with a mass of flowers see photograph below.
I visited Holkham Walled Garden at the end of September and found that most of the Pear trees had the galls on their leaves. The geographic locations of affected trees described herein suggest that the trellis rust fungus is well-established across New York, and has spread undetected since its introduction.
First report of the pear trellis rust fungus, Gymnosporangium sabinae, on Pyrus calleryana ‘Bradford’ and ‘Chanticleer’ and P. Jolfaii and Abbasi, Zeitschrift fur Pflanzenkrankheiten und Pflanzenschutz, 97 3: See below for more information.
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Please consider upgrading your browser to the latest version or installing a new browser. Views View Edit History. Generally, the fungus must cross over to the opposite tree host.