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Black Spots on a Jade Plant
Black Spots on a Jade Plant. Jade plants, members of the Crassula genus, are adaptable houseplants, putting up with dry winter atmospheres and the temperatures that people like. They grow slowly, are easily propagated and have few pests. Black spots on leaves, however, are danger signals.
Jade plants, members of the Crassula genus, are adaptable houseplants, putting up with dry winter atmospheres and the temperatures that people like. They grow slowly, are easily propagated and have few pests. Black spots on leaves, however, are danger signals.
Oedema
Oedema is a metabolic condition, most often occurring in late winter. The plant takes up more water than it can use, which causes wart-like blisters to appear on the underside of leaves. Usually brown or tan corky bumps, oedema may darken if plants become sunscorched. Crassula varieties and other fleshy-leaved plants are susceptible.
Sooty Mold
Scale, a dome-shaped insect, deposits a sticky substance called honeydew as it sucks plant juices out of leaves. With enough humidity, sooty mold will grow on honeydew drops, causing black spots. Scale can be removed by hand. Heavily affected parts of the plant should be pruned out.
Thrips
Thrips are tiny pale-colored chewing insects that are difficult to see. The sooty black fecal matter that some species leave, however, gives them away. Insecticidal soap labeled for use on Crassula species or jade plants and higher humidity may control the problem.
