About Joan Expertise Prickly pear, saguaro, barrel cactus, house cacti... You name it! I will answer all your questions regarding cacti such as winter care, propagation, watering, and indoor care. I will also answer questions on edible cacti (for humans or pets) and identification. In addition, I may answer questions on other succulent plants, such as the agave.
Experience Due to the arid climate here in Nevada, I grew up planting cacti and shrubs to design my landscapes. As years went on, I learned the different ways on taking care of these amazing cacti, especially how to propagate them.
Education/Credentials During the past few years, I have tried out many methods in growing cacti, especially when it comes to propagation. I learned the dangers of over-watering, and have researched that people often make common mistakes. That is why I joined to be part of AllExperts.
Question I have quite a few cactus plants, and on 2 of my larger plants I have found large white patches on them. This just started this year, so I don't know if I am doing something wrong, or if they have some kind of fungus, please help.
Thanks Barbara
Answer Hello Barbara,
The white patches (which look like cotton} is what is known as cochineal scale. It was actually produced by little black bugs as a protective coating. If you squeeze it (I don't recommend doing so with your fingers), you will see a red liquid that comes out. This infection is fatal to your cactus if spread. Take some dish soap and mix it with water. Place the water in a spray bottle and spray it all over the infections. Then take your hose and blast the water at the cactus and its infected areas.
