We use cookies to make your experience better.
To comply with the new e-Privacy directive, you agree to the privacy policy and our use of cookies.
How to control spider mites
Spider Mites – Identification and Control
Spider mites are tiny, slow-moving arachnids that grow up to 1mm long. They have eight legs and are typically red, though they can change colour with the seasons to green or yellowy-brown. Also known as the two-spotted spider mite, they live on the undersides of leaves and feed on the sap. Under the right conditions, one female can lay up to 20 clear eggs a day, and once hatched, the offspring can start reproducing within five days. Spider mites can live up to 4 weeks and thrive in hot, dry, and warm conditions.
Symptoms
-
Thin webbing visible on the undersides of leaves
-
White or cream discoloration and “scorching” on the tops of leaves
-
Reduced photosynthesis, which may cause leaves to fall off
-
Severe infestations can lead to plant death
Control
If you suspect spider mites but cannot see them, place a white piece of paper under the leaves and shake them gently. Use a magnifying glass to spot the tiny, slow-moving mites. Move infected plants to a shady, moist area, and remove all dead or dying infested leaves, discarding them in a sealed plastic bag.
A hose with moderate water pressure can be used to wash the mites off the leaves. Be careful not to use too strong a stream, which could damage the plant. For small potted plants, dipping the foliage upside down into a bucket of water can drown the mites. Check nearby plants regularly and isolate infected plants where possible.
An insecticidal soap can be sprayed directly onto spider mites. As the soap dries, mites stick together and die of starvation. Repeat applications may be necessary until all mites are eliminated. Always test a small area first, as some soaps can harm young shoots.
Predatory insects are another natural control method—they reproduce faster than spider mites and can help keep populations in check. These are available online or in garden centres, though they can be costly.
Tip
Avoid spraying water or soap during the hottest part of the day, as this can scorch leaves. Always aim to water in the morning when temperatures are cooler.