Good sanitation with removal of extraneous plant material and debris which might shelter these pests aids in control. Adult thrips can be identified by a long fringe of hair around the margins of both pairs of wings. Color varies between species with western and other flower thrips being yellow to light brown and banded greenhouse thrips and a few other thrips that feed mainly on leaves being dark brown to black. Feeding takes place with rasping type mouth parts. Infested leaves become curled or distorted, with silver-gray scars or calloused areas where feeding has occurred.
Thrips can transmit the tomato spotted wilt virus to many different ornamentals.
Any unusual symptoms should be investigated. Control - Many materials are registered and effective at controlling thrips. Pesticides should be applied according to label directions. Regardless of the pesticide or mixture of pesticides used, it is strongly recommended that the effects be evaluated on a few plants, under your particular conditions before treating all plants. Bailey, L.H., E.X. Bailey and Staff of Liberty Hyde Bailey Hortorium.