If scale insects are not controlled, death of infested plants is possible. As a last resort, a much stronger azdirachtin product may help tip the scales in your favor (so to speak). Adult females are felt-like white or gray encrustations that stick to crape myrtle parts ranging from small twigs to large trunks. In the South where scale produce several generations over a season, periodic sprays are necessary over the whole summer. Aside from whiteflies, this insecticide can also protect your flowers, shrubs, and trees from a wide range of other common pests. Euonymus scale on foliage.John A. Weidhass, Virginia Tech University. These pests all have needlelike "piercing-sucking" mouthparts that allow them to puncture plant tissue and remove sap or cell contents. Spray all affected stems, and on both the tops and bottom of leaves. With good spray coverage, horticultural oil sprays may kill all stages of scales that are present at the time of application, and often give good control as they kill by suffocation. Pyrethrin kills off insects almost instantly upon contact. A severe infestation of armored scales may weaken or kill a tree or shrub. To reduce the chance of killing pollinating insects, make pesticide applications when shrubs and trees are not in bloom, and always spray in the early evening. Spray biweekly when temperatures average 70 degrees Fahrenheit or higher and monthly in cooler weather to treat scale on sago palms. Make sure to scrape off all the scale packets you can before you spray. This can be quite laborious in an outdoor garden, however. + Kill and control unwanted insects in ornamental and edible gardens, lawns and other areas around your home. Backed by the Ortho® Guarantee. Sevin® Insect Killer Ready to Use is ideal for target spot treatments of specific plants or small garden areas. Go to the Natural Insecticides section … Neem Oil Soap, Hot Pepper Wax, and Garlic Barrier all have this potential repellent capability when applied properly on the tops and the bottoms of leaves of the target plant. }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; }, AzaMax is a natural product with a broad spectrum of pest control and broad plant applications. Evergreen plants can also be treated in the fall, and the majority (approximately three fourths) of the ornamental plant hosts of armored scales identified in the last two years were evergreen plants. Most trees and shrubs can tolerate application of horticultural oil even during the summer months. The hard scale lives and feeds under this spherical armor and does not move about the plant. See Table 2 for examples of horticultural oils for scale control. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. Insecticide Active Ingredients & Products Labeled for Control of Armored Scale Insects in Residential Landscapes. Crawler activity often coincides with the flush of new plant growth in the spring. How to Treat Scales on Trees. If you need an insecticide to treat cycad scale, try horticultural oil. In most cases, they are able to move short distances (but rarely do) and produ… There are several natural insect repellents that often kill scale on contact before they build their hard shells early in the season, but then will create a bad taste for the critter and make it go someplace else to munch. Almost 40% of the Clemson Plant and Pest Diagnostic Clinic sample submissions for home landscapes during 2012 and 2013 were scale insect pests, and of these, almost 90% of the species were the more difficult to control armored scales. Several lady beetles and wasps are important pests of scale, so reduced use of non-specific pesticides is recommended to encourage these insects. In general, avoid using contact insecticides as much as possible as they will often kill the naturally occurring enemies of scale insects. Try using a product like AzaMax, which is derived from neem oil naturally, inside greenhouses or indoor growing areas. Plants should be kept as healthy as possible to reduce the chance of scale infestation. Because of their short residual, they help to conserve beneficial insect species. It effectively kills mealybugs, scale, thrips, beetles, mole crickets, ants, termites, weevils, aphids, chinch bugs, white grubs, and much more! 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