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Brown rot – an aptly named and unwelcome disease of stone fruits

I have a sour cherry tree in my yard that declines a bit more each year. It is in sad shape, with seared-open main branches injured by sun scald and invaded by decay fungi. This all stemmed from leaf loss due to an ongoing and pervasive case of brown rot caused by the fungus Monilinia. This organism infects first through the flowers, usually after a rain while the flowers are open.

By |2020-08-11T15:15:03+00:00April 21st, 2020|Plant disease|0 Comments

Governed by Micrometeorology: Apple Scab and Spore Dispersal

Apple scab, that fungal disease known to just about anyone who had grown an apple, can convert a promising young fruit into a disfigured, unappetizing reject. Although safe to eat, in this day of readily available perfect fruit, we would rather do without scabby fruit.

By |2020-08-11T15:16:07+00:00November 19th, 2019|Plant disease|0 Comments

Propagation pitfall: Leafy gall disease

Now is the time when nurseries are propagating plants for the upcoming spring season. Odd looking plants with too many shoots or buds could be infected with the pathogenic bacterium Rhodococcus fascians. Propagators should be alert for symptoms, as shown in the gallery below, and have suspicious plants tested for the presence of the bacteria.

By |2020-08-11T15:16:07+00:00November 12th, 2019|Leafy gall, Plant disease|0 Comments