New answers tagged cactus
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This cactus has downy mildew. It can occur with a lot of shade and high humidity and colder nights. Get some neem oil. Mix with a few drops of dish detergent and spay after the sun goes away. repeat ever 5 days for one month. The white spots are the fruiting body of the fungus. The brown is another type of fungus. Neem oil prevents spread and the fungus ...
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