What is that white stuff on my cactus?

What is that white stuff on my cactus?

How to Get Rid of Mealybugs on Your Cactus (and prevent them from coming back) - Potted Pixie

What is that white stuff on my cactus?

Fungal / Mold Growth on Prickly Pear Cactus - Opuntia Mill. fungal infections, white fuzz, mealybugs

What Are The White Spots On My Cacti?

White Spots on a Jade Plant - World of Succulents

There's white stuff on my cactus. It isn't fuzzy or sticky, and it isn't bugs. I think the cactus I have is a young dragonfruit cactus. Why is this stuff here and

What is that White Cottony Stuff on my Prickly Pear Cactus?” — Phil Hardberger Park Conservancy

Identify and Control 7 Common Christmas Cactus Pests

WHAT ARE THOSE WHITE SPOTS ON YOUR SUCCULENTS?