I’ve heard people talk about the white stuff that appears on a prickly pear cactus pad but never knew for sure what it was. Some said a fungus that would kill the plant. Others said it could be washed off….but I never heard about it being caused by an insect. After a few clicks on Google and Bing, I found the answer! Thought you readers may be interested so am posting it here. Very interesting. Click on each page so it gets large enough for you to read.