Even though cacti use those prickly spines to keep most predators at bay, these desert succulents aren’t invincible when it comes to pests. Every now and then, your indoor green friends might find themselves under attack. But don’t worry! Here is a quick guide on how to spot these uninvited guests and get rid of them using eco-friendly methods.
Pest #1: How to Spot & Stop Spider Mites
Spider mites are tiny little critters that spin delicate, almost invisible webs between the ribs and stems of your cactus. If you notice small, yellowish speckles on the plant’s skin (the epidermis), you’re likely dealing with a spider mite infestation. Here’s the best way to handle them sustainably:
- Wrap the cactus root ball tightly in a plastic bag to keep it dry.
- Give the entire succulent a thorough rinse under lukewarm water in your shower.
- If you’re treating a leaf cactus (like a Christmas cactus), seal the plant inside a transparent plastic bag for three days to create a humid environment they can’t survive.
- For desert cacti, skip the bag and treat the plant with Neem oil, which you can easily find online or at your local garden center.
Pro Tip: Always isolate your “patient” from the rest of your plant family during treatment. This keeps the mites from hitching a ride to your other healthy succulents!
Pest #2: Successfully Fighting Mealybugs
Mealybugs are a bit tougher because they hide under waxy, protective shells. If you have a major infestation, these mealybugs look like a fuzzy, white cotton-like coating on your cactus. To get rid of them, you have to dissolve that waxy armor, and the best tool for the job is rubbing alcohol.
If you only see a few, just dab them individually with a cotton swab dipped in alcohol. For a larger breakout, you can spray the plant with a diluted alcohol solution. However, if your cacti live in a conservatory or greenhouse, nature might have a better solution: beneficial insects! Ladybugs (specifically the Mealybug Destroyer) love to snack on these pests and will do the dirty work for you.
Pest #3: Outsmarting the Black Vine Weevil
If you keep your cacti outdoors, you might run into a large, black beetle known as the Black Vine Weevil. These guys are bad news because they munch on both the roots and the stems, leaving behind very distinct, semi-circular bite marks.
The secret weapon here? Nematodes. These microscopic roundworms are a gardener’s best friend. You can buy them as bait traps or mix them into your watering can. They’ll seek out the weevil larvae in the soil and take care of the problem naturally without any harsh chemicals.
