Symptoms. Publ. With eight generations each year to deal with, that adds up to a losing battle. Mulch or mesh that reflects light interferes with certain flying insects’ ability to locate plants. Behavior, body appearance, and host plants help to distinguish among thrips species (Table 1). Predatory thrips (Table 2), green lacewings, minute pirate bugs, mites, and certain parasitic wasps help to control plant-feeding thrips. Silver or gray is the most effective color for synthetic reflective mulch or mesh, but white also works. Flint, M. L. 1998. Western flower thrips is very difficult to control with pesticides because pupae are present in the soil, eggs are inserted into the plant tissue, and larvae and adults hide within flowers and in leaf crevices where pesticide penetration is poor. Greenhouse thrips is sluggish and the adults tend not to fly. Pest species are plant feeders that discolor and scar leaf, flower, and fruit surfaces, and distort plant parts or vector plant pathogens. Delay systemic insecticide application until after plants have completed their seasonal flowering, unless the product label directs otherwise. Thrip Control and Thrips control products at DoMyOwnPestControl.com with Free Shipping and Expert Advice. Oakland: Univ. Infested terminals may discolor and become rolled. Western flower thrips also vectors Impatiens necrotic spot virus and Tomato spotted wilt virus, which can severely damage or kill certain vegetable crops and herbaceous ornamentals. Systemic insecticides are absorbed by one plant part (e.g., roots) and moved (translocated) to other plant parts. PATRICIA J. BROBYN. However, pollen feeding on plants such as orchids and African violets can leave unsightly pollen deposits and may reduce flower longevity. Once plants become larger or temperatures get warmer, remove covers to provide enough growing space and to prevent overheating. 3359. The habitats of these pests will largely depend on the weather. The western flower thrips strain that invades protected crops (i.e glass, plastic and tunnel houses, as well as indoors) is known to be resistant to many of the thrips insecticides on the market.The larvae and adults of thrips are more susceptible to insecticides than eggs, pre-pupa and pupa. Thrips feeding on plants can damage fruit, leaves, and shoots and very noticeably affect plants’ cosmetic appearance. Nat. To avoid tree injury and potential spread of pathogens on contaminated tools, use a soil application or trunk spray whenever possible, instead of injecting or implanting trees with insecticide. In Australia these include synthetic pyrethroids, organophosphates, carbamates, and the newer, narrow-spectrum pesticides such as spinosad. Division of Agriculture and Natural Resources Centre for Biological Information Technology, The University of Queensland. However, western flower thrips is regarded to be a 'pesticide-induced problem', having developed resistance to pesticides from different chemical classes. Where plant viruses are a problem, insecticides typically do not kill thrips fast enough to prevent the transfer of virus from thrips to plants. On plants with a history of unacceptable damage, begin treatment early when thrips or their damage is first observed. Acknowledgements Bethke, J. Improper timing of application, failure to treat the proper plant parts, and inadequate spray coverage when using contact materials are common mistakes that can prevent potentially effective insecticides from actually providing control. 3332. Where thrips lay eggs on grapes, fruit may develop dark scars surrounded by lighter “halos.” Thrips feeding on apples, nectarines, and raspberries can deform or scar developing fruit. 3402. For example, western flower thrips more often damages fragrant, light-colored, or white roses. Aluminum foil is also effective and may be suitable for a small garden; but it is expensive and difficult to reuse because it is delicate to handle. Unfortunately, we cannot provide individual solutions to specific pest problems. Microbiology & Crop Protection Department, Horticulture Research International, Littlehampton, West Sussex BN17 6LP, UK . Thrips. Management to prevent or delay the development of resistance is necessary for increasing the chances of effective chemical control. 2019 However, there are problems using pesticides to control thrips. Contact UC IPM, Agriculture and Natural Resources, University of California, © 2019 Regents of the University of California Chemical control of Western Flower Thrips (Frankliniella occidentalis Pergande) NEIL L. HELYER. There are also chemicals used to combat thrips, but they tend to develop resistance quickly. However, thrips can be positively identified to species only by an expert. In many cases, by the time symptoms of feeding damage are observed, it is too late to provide adequate chemical control. Chemical control Petroleum spray oils can be used to control thrips and are compatible with IPM programs. Superscript in Table 1 indicates possible resistance already present in the WFT population. If handled carefully, these may be used for more than one season. Thrips are resistant to many control methods regardless of thrip species that reflects light interferes with certain flying ’. 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