IDENTIFY and CONTROL SPIDER MITES

Mites are 8-legged arachnids, the most common being the spider mite. They’re tiny and look like moving dots of red, yellow, green, or brown. Because of their tiny size, they can be very difficult to spot. If plants develop webbing, discolored spots, or appear yellow or wilted, closely inspect the leaves—top and bottom—and determine if the pest is present. If you’re still unsure, try shaking a damaged leaf over a sheet of white paper. If tiny specks appear and move, there’s a good bet you’re seeing spider mites.

Mites pierce into plants to feed on their sap. This activity weakens the plant and creates discolored spots, streaking, or scarring on the leaves. They can also cause leaves to turn a yellow-bronze or curl. This damage can lead to leaf drop and may eventually kill the plant.

Inspecting your plants regularly is essential for early detection and continued plant health. The easiest way to successfully rid plants of spider mites is to catch them early. Remember, mites can be carried from plant to plant by the wind. They can also overwinter in several stages of development.

On outdoor plants, a forceful spray of water can help reduce populations. Prune infested leaves, twigs, and branches, removing all from your property.

For houseplants, isolating the infected plant will help prevent spread. Introducing green lacewings, predatory mites, beetles, or midges—natural predators of these pests—can help reduce populations.

For larger infestations, consider coating leaves with neem or horticultural oil can to smother mites. Multiple applications, around every 10 days, will probably be necessary. Please note, mites are most active in hot, dry weather—conditions in which the use of oils can be dangerous for the plants.

Spider mites are arachnids, not insects, so many systemic insecticides are ineffective. Regardless of the method or product used, always follow the instructions and never spray when beneficial insects are present.

Weak, under-potted, and stressed plants are more likely to become infested with these pests. Keeping your plants properly watered, fertilized, and overall healthy is the best way to avoid attracting them.