Sarah Jandricic, Greenhouse Floriculture IPM Specialist, OMAFRA, PROGRAM EXPANSION: Agri-Food Workplace Protection Program. Our 3 IN 1 CONCENTRATE is similar to Multipurpose Insect Killer but it includes a fungicide making it a “dual action” product. Adults are about the same size as the silverleaf whitefly (0.9- 1.1 millimeter). Nymphs are greenish-yellow, oval and flat. Biological Control. When the wasp eggs hatch, the larvae feed internally on the whitefly nymphs, eventually killing them. Whitefly control is difficult and complex, as whiteflies rapidly develop resistance to chemical pesticides. The eggs hatch into tiny “crawlers” that walk a short distance before settling at a feeding location. However, it should be noted that this was likely a RESIDENT population of thrips that had been building up within this greenhouse — meaning they may have been more susceptible to chemicals. Chemical Control. A list of commercial suppliers of natural enemies in North America can be obtained by visiting www. Silverleaf whitefly fourth instars are also known as “red-eye nymphs” because the relatively large eyes of the developing adult are already visible through the nymph integument (skin) during this stage. These nymphs lose their ability walk, and remain in the same location for the rest of their development until they pupate and emerge as winged adults (Figure 1). In the absence of natural enemies and other natural control factors such as heavy rain, a few individuals can produce thousands in a very short time. Although adults of some species have distinctive wing markings, many species are most readily distinguished in the last nymphal (immature) stage, which is wingless and lacks visible legs. Augmentation biological control has been effective in controlling whiteflies in greenhouse ornamental production. Thank you to the growers and consultants who shared data to make this post possible, as well as to A. Summerfield (University of Guelph) for helping with sample collection and identifying all thrips species. Whiteflies migrate from alternate hosts because numbers have become too high or the crop is being harvested (e.g., after cotton defoliation). A few adults feeding on plants will usually not cause significant damage and do not warrant treatment. Pupae are oval, slightly raised (with vertical sides) and have a fringe of wax filaments along the upper perimeter. This category includes the Delphastus catalinae beetle. Eggs are oblong, smooth and are initially yellow but darken before hatching. It is particularly useful in reducing whitefly populations in greenhouses, although it may also be used outside. Whiteflies are “true bugs” (Hemiptera) that feed on plant sap, much like aphids. The market is filled with toxic chemical sprays and it is easy to find a Whitefly chemical control. When feasible, avoid growing susceptible plants of different ages together in one place or immediately replanting after harvest when pests from a previous crop may still be present. Honeydew may cover plants and support the growth of sooty mold, which reduces the plant’s ability to use light for photosynthesis. sales are realistically threatened by damage or pest pressure). The presence of high numbers of onion thrips (especially in specific varieties such as “white magnum” and “feelin’ green”) helps explain why the grower’s usual biocontrol program wasn’t working. Use a magnifying lens (10X) to facilitate observation. New Chemical Control Option for Thrips and Whitefly June 3, 2020 Sarah Jandricic, Greenhouse Floriculture IPM Specialist, OMAFRA A new pesticide is available for greenhouse ornamental production in Canada that has shown potential for effective suppression of difficult-to … Their rapid reproduction rate makes them difficult to control once established. However, this biocontrol agent is VERY sensitive to chemicals, including Ferrence. Implementing cultural control practices to limit whitefly colonization. Whiteflies commonly attack vegetable and landscape plants and can be difficult to control. However, we all know control of Bemisia whitefly, especially in Poinsettia, doesn’t come without a few caveats. Biological control is the manipulation of natural enemies to prevent or suppress damage from pests. Accumulation of these wax strands resembles fluffy-white hair. Do not wait until damage is obvious because whitefly control is very difficult to achieve at that point. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Our pest problems will melt away! A certain number of whiteflies may be tolerated when they do not cause significant damage. As many chrysanthemum growers in Ontario face a mix of both thrips species anyways, the distinction may be a moot point. Organic Whitefly Control Before trying more serious white fly treatments, you should begin with something very simple: blast your plants with water. Many compounds have been used, but the systemic Marathon (imadacloprid) has been used most frequently over the past few years. Accurate species identification and pest diagnosis to select proper control action. Insects that are resistant to one insecticide may also be resistant to other insecticides (cross-resistance). At the time of that posting in Fall 2019, Ference wasn’t yet registered for ornamentals in Canada. Initially, insecticides were used successfully for control, but the whitefly’s short life cycle means that resistance builds up quickly and new chemicals are constantly needed to control the pest. Whiteflies, with the exception of the silverleaf whitefly, rarely require chemical control. Eggs are oblong, smooth and yellow to amber brown and are laid randomly on the underside of leaves. Adults are tiny insects with yellowish bodies and four whitish wings. Generally, botanists advise against strong chemical pesticides or insecticides and recommend different methods of biological control such as using whitefly predators, hosing down the infected plants, or using an agricultural soap or insecticide oil. They can be recognized by two irregularly shaped (in zig-zag pattern) gray bands on the front pair of wings. Resistance may be delayed by alternating the types of chemicals … Managing these species may be very difficult if populations are not detected early. Insecticidal soaps and horticultural oils are contact insecticides that cause suffocation and desiccation of nymphs and adults. High-pressure water sprays are recommended at least once a week for three consecutive weeks and can be repeated as necessary. Their appearance resembles tiny, pure white “moths” but they are in fact, closely related to sap-sucking aphids. As a result, the silverleaf whitefly appears more slender than other common whiteflies. The adult is the most mobile stage and is responsible for colonizing the host plant. For more information on Texas insects and entomology, see http://insects.tamu.edu. Since whiteflies can be so difficult to control, combining cultural, biological, and chemical methods for the optimal level of whitefly treatment. Make sure the plants are free of whiteflies before putting them with established plants. Do you have a question -or- need to contact an expert? Yes, the chemical insecticide will get rid of the whitefly … Wingless nymphs are flattened, oval and almost scale-like in appearance. Relatively large wax filaments project from their bodies; the number and length of these filaments varies with the host plant. Foliar damage by thrips can also be seen in the background. They usually combat the whiteflies along with a wide range of other common garden pests. The secret to effective whitefly management is to apply controls immediately when numbers reach this level. As they don’t move after the creeping phase, they will starve and die. However, Ference (i.e. They derive their name from the mealy white wax covering the adult’s wings and body. Predators of whiteflies include ladybeetles (Delphastus and Nephaspis), green lacewings (Chrysopa and Chrysoperla), minute pirate bugs (Orius), big eyed bugs (Geocoris) and damsel bugs (Nabis). Delphastus pusillus is the most whitefly-specific predator available. When lower rates were applied preventively, there was very little suppression compared to the control treatment (water). Photo courtesy of A. Summerfield (UofG). Generally, apply pesticides during early morning or late afternoon to avoid the hottest part of the day. Keep reading for  efficacy data on ornamental crops and best management practices for incorporating this chemical into your IPM toolbox. Download a printer-friendly version of this publication: Whiteflies (pdf), View more Gardening & Landscaping information ». Removing infested leaves from plants may be enough to control small populations on less preferred hosts. Whitefly is plant-sucking insects, which usually found in Indoor plants, Vegetable, and greenhouse plants. Eggs are occasionally laid in circular patterns on plants with smooth leaves. Consult your county Extension agent for additional help identifying a species. Silverleaf whitefly pupae are oval, flattened (with tapering sides) and lack the marginal fringe of wax filaments common to other whiteflies. Table 1 lists some whitefly control products available to commercial ornamental producers, and Table 2 shows products available to homeowners. This is an occasional pest of crops and ornamental plants, especially hibiscus. 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