Succulent Plants

What Are Flat, Whitish Spots and Brownish, Slightly Raised Spots Appearing on Succulents and Cactus

Garden Nut added on October 18, 2013 | Answered

White spots on some succulents and brown slightly raised spots on others. I cannot see any insect that might be making them. Are the plants diseased? How to cure?

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Answered on October 18, 2013

It sounds like scale. This article should help identify:

In addition to insecticides, both systemic and contact, I've used water pressure to help control scale. If the skin of the cactus or succulent is reasonably tough, I've applied water through a shut-off valve that knocks the scale from the plant. Be careful that the stream of water isn't so hard that it damages the plant. After getting scale from the plant, I usually use both contact and systemic insecticides. In the case of scale, my theory is, "Either kill the scale or kill the plant." Sometimes, if the infestation isn't too large, a toothbrush works well. And, remember, there are several varieties of scale. Color can indicate variety or maturity of insect.

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