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.
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% )