Thrips of Geranium

Disease Information


Symptoms and damage

Thrips are often the most serious insect pest in greenhouses. They are very difficult to control once a population becomes well established. Thrips feed on leaves and flowers of a wide variety of host plants. The feeding injury can render a plant unmarketable and the act of feeding by a thrips can transmit viruses to a susceptible host plant. The thrips lifecycle begins as an egg is deposited in plant tissue. After the larvae emerge they begin feeding on the plant. Thrips pass through 2 larval and transformation stages before becoming an adult. Feeding injury is done by the larvae and adults, but only the adults can transmit viruses.


Although thrips damage to leaves is unsightly, thrips activity does not usually warrant the use of insecticide sprays. For ornamental nonfood plants, a licensed pesticide applicator can use the systemic pesticides, but oils will provide control of adults.

Examples of Insecticides (Abamectin (Avid) - Spinosad (Conserve) - Percent of total area treated- Percent of total area treated: 34% - Percent of total area treated: 39% - Percent of total area treated: 32% )


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