Spider mites are small arachnids related to spiders and are common in low rainfall areas of the West where warm summer temperatures and dry plant foliage favor their development. The two-spotted spider mite, Tetranychus urticae, is orange, green, or yellow, with two dark spots on the sides of the body. During severe infestations, the entire plant may turn yellow and die. They tend to feed on the underside of rose leaves, especially older leaves.
Mites are less than 1/16 inch but are visible to the unaided eye, and a magnifying glass or hand lens makes them easy to see. The most common symptom on the rose is foliage that is bronzed color and stippled. From a distance, leaves look yellow and dusty.
Mites over winter as mated females in protected areas such as on weeds, ground litter, or fallen leaves. They do not over winter on roses, which means dormant oils are not effective.
Spider mite populations can build up to tremendous numbers and can decimate roses in a very short time if the conditions are right. Hot, dry weather, plants that are very close together with little air circulation, and little water offer a haven for these little creatures.
When hosing off the plant, make sure to rinse the entire plant, top to bottom, as well as the undersides of the leaves using a hard spray of water. Once spider mites are knocked off of the plant.
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