Thrips can be difficult for growers to detect due to their small size and tendency for hiding within the concealed parts of the plant. Comparison between adult western flower thrips right and adult echinothrips left.
Rose petals may develop dark streaks and spots from feeding injury that occurred before the buds opened or the flower buds may deform and fail to open.
Western flower thrips. Wft feed on plant tissue by rasping and sucking sap childers and achor 1995. Western flower thrips frankliniella occidentalis frankliniella occidentalis the western flower thrips is a key pest of glasshouses greenhouses and polytunnels. The maxillae then ingest the fluids from the cells but not directly from the vascular tissue.
This species of thrips is native to the southwestern united states but has spread to other continents including europe australia where it was identified in may 1993 and south america via transport of infested plant material. Western flower thrips will also ingest the contents of pollen grains. Western flower thrips frankliniella occidentalis a north american species present in britain since 1986.
However the primary damage caused by wft is the transmission of tomato spotted wilt virus tswv to tomato plants. Western flower thrips is primarily a pest of herbaceous plants. Attacks the foliage and or flowers of many glasshouse plants especially tomato cucumber streptocarpus african violet fuchsia gloxinia achimenes pelargonium cyclamen chrysanthemum verbena primula obconica and impatiens.
In the netherlands for instance the annual cost of western flower thrips was put at us 30 with another us 19 million for tswv. Thripidae is a native insect of the western part of north america that was first reported in 1895 in the 1970s and early 1980s this species spread throughout north america beshear 1983. Some countries have produced figures for the estimated costs of western flower thrips and tswv.
The western flower thrips wft frankliniella occidentalis pergande is an important pest of tomato plants causing direct and indirect damages. However western flower thrips is the predominant species and the most difficult to control. Thrips need only a few minutes of feeding to transmit the virus.
The western flower thrips frankliniella occidentalis pergande is an invasive pest insect in agriculture. But high populations can damage flowers on woody plants such as roses. Wft damage potential is due not only to its ability to directly damage greenhouse grown crops by feeding on leaves and flowers but also because they may vector destructive tospoviruses.
Soon thereafter it was found in europe in dutch greenhouses and has since become an exotic pest of greenhouse production in. Western flower thrips wft frankliniella occidentalis is still one of the most destructive insect pests of commercial greenhouses feeding on a wide variety of horticultural crops. Western flower thrips has a punching sucking feeding habit using the mandible to punch a hole into the host and then inserting the maxillae into the opening.
It has been documented to feed on over 500 different. Adult western flower thrips are approximately 1 2 mm in length and generally yellowish brown in colour. Western flower thrips wft frankliniella occidentalis pergande thysanoptera.