Cactus or succulents have white spots on the leaves or stems. What do I do ?

White spots on Crassula arborescens
White spots on Crassula arborescens

If your cactus or succulents have white spots on the leaves or stems, it is very likely that you have powdery mildew (powdery mildew) . This fungus is very common in indoor plants. But I have good news, it’s easy to deal with if you notice on time.


My succulents have white spots

It is very easy for the succulents to suffer from powdery mildew for a simple reason. This fungus likes the same kind of habitat as succulents like: warm and relatively dry areas.

If your cactus or succulents have a powder white, gray, yellow or dark brown suffers from powdery mildew. The fungus will be visible in the leaves, stems and buds of the succulents.

Effects of powdery mildew on succulents

If left untreated, powdery mildew can be deadly for cacti and succulents. The leaves will deform more as the infection spreads. The leaves and stems can also turn pale green and then yellow.

If your succulent has a severe infection, it can lose leaves, not flower and die.

Treatment against powdery mildew in cactus and succulents

To treat powdery mildew, remove and throw off infected leaves and stems . Treat your cactus and succulents with milk to the next proportion.

  • 1 part milk
  • 3 parts water

Pour the solution into a spray bottle and spray the leaves and stems . Remember to sprinkle the bottom of the leaves, and since they are in those, also treat nearby plants.

If you have a serious infestation , repeat the process for two or three days. Then repeat every 14 days to prevent new outbreaks.

Over time the pests become immune to the same treatments. If you want to see other ways to treat powdery mildew, read the following article.


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