What is that white cotton fungus looking stuff on my prickly pear cactus?

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What is that white cotton fungus looking stuff on my prickly pear cactus?

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A. That is not a fungus at all, it’s an insect called Cochineal Scale. The white cotton is a protective coating on top of the scale. To control, jet spray with water to clean off the pads of the cactus. For stronger control, speak with a Nursery Professional.

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