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Gardening Know How Questions & Answers - https://questions.gardeningknowhow.comWhite 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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1 Comment To "What are flat, whitish spots and brownish, slightly raised spots appearing on succulents and cactus"
#1 Comment By AnnsGreeneHaus On 10/18/2013 @ 9:27 pm
It sounds like scale. This article should help identify: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm [1]
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.