Black rot (Botryosphaeria obtusa) on apple fruit. Chalara elegans) is the causal agent of black root rot. The fungus infects a wide range of hosts, including plants from at least 15 families, and can be found in all parts of the world. (Chickens can handle most of the bugs. Photo by University of Georgia Plant Pathology , University of Georgia, Bugwood.org via CC 3.0.. If the fruit start to rot early in the season, the lesions start as reddish spots and progress to be purple surrounded by a red halo. Black Root Rot: Thielaviopsis basicola The fungus Thielaviopsis basicola (syn. Fungicide Treatment Spraying infected grape vines every 10 to 14 days with an appropriate fungicide helps cure black rot disease. You can control and prevent black rot with chemical treatment and proper cultural care. Prune out any diseased parts of the vine too. Fungicides capable of controlling black rot include captan, copper and mancozeb. All, I have a great idea for keeping grapes without spraying, but I'm running up into problems with fungal diseases. https://www.aos.org/orchids/orchid-pests-diseases/black-rot.aspx Black rot spores love moisture, so you want to reduce the amount of moisture held in the canopy by providing great air circulation. This year, black rot ruined all of the few clusters our young grape vines produced. )Specifically, here on the East Coast and with all the water we get here, black rot is a common fungal disease of grapes. Keep the vine tied up to a trellis to allow air to flow through. During dormancy, prune heavily keeping only a few healthy, strong canes from last year’s growth.
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