How to get rid of mealybugs and spider mites on indoor plants

By the time you notice mealybugs, they've been on the plant for weeks. That's the frustrating part. The white fluff in the leaf joints is the adults. The eggs and the crawlers are already in the soil surface, under the pot rim, and on the plant next to it.

So the first rule of dealing with either pest is that one spray never works. Not ours, not anyone's. You're going to spray three or four times over two weeks, and the plants around the infected one get sprayed too. If you can accept that going in, the rest is straightforward.

Which one do you have?

Mealybugs look like tiny bits of cotton wool, usually tucked where a leaf meets the stem, on the underside of leaves along the veins, or in the folds of a new leaf that hasn't opened yet. Touch one and it smears. The leaves around them get sticky, and you may see black sooty patches growing on that sticky residue. Money plants, hibiscus, ficus, jade, and almost any succulent get them.

Spider mites are much harder to see. What you'll notice first is the leaf: a fine pale speckling, like someone dusted it with flour from underneath, and then a dull, faded look across the whole leaf. Turn it over and look at the underside near the stem. If there's fine webbing, that's mites. Hold a sheet of white paper under the leaf and tap it. Tiny moving dots on the paper confirm it.

Mites explode in hot, dry conditions. A room with the AC running all day in July, or a west-facing balcony in Multan, is exactly what they want. If your plant was fine in spring and went speckled in June, that's why.

Step one: isolate

Move the infected plant away from the others. Not to the other side of the same shelf. A different room if you can. Mealybug crawlers walk from pot to pot, and mites travel on a breeze or on your hands.

Then check everything that was within arm's reach of it. Look in the leaf joints and under the leaves. You will usually find a second plant that's in the early stages.

Step two: remove what you can see

For mealybugs, dip a cotton bud in rubbing alcohol (the ordinary spirit from any pharmacy) and dab each visible cluster. The alcohol dissolves the waxy coat that protects them, and they die on contact. Go through every leaf joint. It takes ten minutes on a medium plant and it removes most of the adult population before you spray anything.

For mites, take the plant to a bathroom or outside and rinse it with a strong stream of water, especially the undersides of the leaves. Water alone knocks off a large share of them and breaks up the webbing so the spray can reach what's left.

If a leaf is more than half covered, cut it off and bin it. Don't compost it.

Step three: spray, and keep spraying

Mix Shield & Feed at 10ml per litre of water and shake until it goes milky. Spray the whole plant until it's dripping. Top of the leaves, underside of the leaves, the stems, the leaf joints, and the surface of the soil. The places you can't be bothered to reach are the places they're hiding.

Do this in the evening after the sun is off the plant, or early in the morning before it arrives. Neem oil on a leaf in direct sun scorches it. Then repeat every three to four days for two weeks. That's four or five sprays in total. The gap matters because neem doesn't kill eggs, so you're catching each new batch as it hatches.

After two weeks, check the undersides again. If it's clear, drop to one spray every fourteen days for the next month as insurance, then stop.

If you'd rather use plain neem oil without the seaweed feed, the water-soluble neem oil works the same way at 5 to 7ml per litre during an outbreak. It mixes without dish soap, which matters because dish soap on its own strips the leaf's protective coating and makes it more prone to burning.

What not to do

Don't reach for the chemical spray from the hardware shop. Most of what's sold loose in Pakistan for garden pests is meant for field crops, and used indoors on a potted plant it's more likely to damage the leaves than the mites. Some of it also isn't safe to have in a room with children or pets.

Don't spray in the afternoon. We've said it twice already because it's the most common reason people write to us saying the spray burned their plant.

Don't feed a plant that's mid-infestation with a heavy nitrogen fertilizer. Soft new growth is what mealybugs and mites like most. Wait until the pest is gone, then feed.

And don't stop after one spray because you can't see any bugs. You couldn't see them before either.

Stopping it happening again

Mites need dry air. If your plants are in an AC room, group them together so the air between them stays a little more humid, and mist them a couple of times a week in summer. Wiping the leaves with a damp cloth every fortnight removes mites before they build up, and Lush Leaf does the same job while keeping the dust off.

Mealybugs tend to arrive on a new plant from a nursery. Keep any new purchase apart from your collection for two weeks and check it before it joins the rest. A preventative spray of Shield & Feed once a month through the summer catches anything that slipped through.

A plant that's stressed gets pests first. Bad light, wet feet, compacted soil, no feed for a year. Fix those and you'll spray a lot less. The Master Blend worked into the soil every four to six weeks covers the feeding side, and the neem cake in it deals with the soil pests you'd otherwise never see.

Photos help if you're not sure what you're looking at. Send one on WhatsApp at 0370-9145600 with a close-up of the underside of an affected leaf.