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Aphids and Spider Mites
Aphids are a greenish brown insect that suck the juices from roses, and can eventually cause your roses to dry out. To effectively treat them, simply blast your roses with soapy water.
Spider mites may cause leaves to be stippled or bleached, often with webbing, or they may cause leaves to dry up and fall. They are tiny and are best seen with a hand lens. Spider mites are usually associated with dry, dusty conditions. The spider mites increase rapidly if their natural enemies are killed by broad-spectrum insecticides applied for other pests. For instance, applications of carbaryl applied to control other pests are frequently followed by an increase in mite populations. Conserving natural enemies, providing sufficient irrigation, and reducing dust may all help control mites. Overhead irrigation or periodic washing of leaves with water is also very effective in reducing mite numbers. Spider mites can also be controlled with insecticidal soap, horticultural oil, or neem oil. Releases of predator mites have been used in some situations.