Do not apply imidacloprid (Merit or Bayer Advanced Citrus Fruit and Vegetables) for cottony cushion scale control. The beetles are poisoned when they feed on cottony cushion scale that have ingested imidacloprid. There doesn’t seem to be much literature out there about that. The insect is 1/8 inch long, oval, yellowish tan, with a brown margin. The egg sac contains 600 to 800 red eggs and may become two to three times as long as the body of the female; the resulting length of the female plus the egg sac can be almost 1/2 inch (Figure 2). Res. Here are some points to consider: Proper timing of foliar sprays is a key to success. I personally have much more success with the rubbing alcohol, however. Oakland: Univ. Managing Cottony Camellia Scale Insecticides. Damaged plants show more symptoms … The cottony camellia scale also is found on yew and holly. For additional photographs of each life stage of cottony cushion scale, consult Stages of the Cottony Cushion Scale (Icerya purchasi) and its Natural Enemy, the Vedalia Beetle (Rodolia cardinalis).  Cottony Cushion originates from Australia and is rumored to have come to the US by accident in the late 1800’s on a plant shipment. But this scale insect that attacks our ornamentals at this time of year is anything but that. Cottony Camellia Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. 7411. Ants love this stuff so you might now also have an ant problem. Commonly occurring host plants of cottony camellia scale inresidential landscapes include camellia, holly, yew, English ivy, rhododendron, hydrangea, mulberry, Japanese maple, sweetbox, euonymous, pittosporum, and jasmine. Make the pruning cut about 1/4-inch above a leaf or at the base of the branch. Here is a before and after of a mature Cottony Cushion Scale, seconds after spraying it with the rubbing alcohol: This technique has been a godsend to my trees, and doesn’t have the toxicity that pesticides do. Grafton-Cardwell, E. E. 2002. To make matters worse, imidacloprid is very toxic to vedalia beetles. My hero, worked perfectly to remove cottony cushion scale. First described in 1870 by Westwood, the cottony camellia scale, Pulvinaria floccifera (Westwood), shows up most commonly on holly in PNW nurseries and landscapes. Figure 1. Natural enemies are the best way to control Cottony Cushion Scale: the Vedaila Beetle and the parasitic fly Cryptochaetum. Using the alcohol is not a reasonable solution & I can’t find where to buy the ladybug Rodolia cardinalis or how to use them. Can you help me? Contact webmaster. For noncommercial purposes only, any Web site may link directly to this page. When the adult fly emerges, it creates a round emergence hole, easily seen in the scale. Hi. Or at least try it on the leaves that are jam-packed full of insects. Feeding can result in defoliation and dieback of twigs and small branches when infestations are extremely heavy (Figure 7). Nat. Division of Agriculture and Natural Resources Change the tape at regular intervals, about once a week, and examine it with a hand lens to identify the crawlers. Two treatments 10 days apart are usually needed. See: Camellia (Camellia)-Cottony camellia scale. The crawlers are red with black legs and antennae. Scale control is challenging and may require action over several seasons. Don't worry – this won't hurt your camellias a bit. I spray the underside of the leaves where the eggs are, and they also turn rd and die. The other important natural enemy, the parasitic fly Cryptochaetum iceryae (Figure 12), deposits one to four eggs inside each second-instar, third-instar, or adult female scale body. To improve biological control, keep ants out of trees and shrubs by banding the trunks with sticky substances such as Tanglefoot or by using ant baits. Stages of the Cottony Cushion Scale (Icerya purchasi) and its Natural Enemy, the Vedalia Beetle (Rodolia cardinalis). Pests of Landscape Trees and Shrubs: An Integrated Pest Management Guide, 2nd ed. To manage the crawler stage is also the easiest stage to control insect! Diseases and is least disruptive of natural enemies females cottony camellia scale treatment ’ t control adults well parts of the plants grow. Long tail attached at the end holding the egg sac and feed on cottony cushion scale easy to Dawn. To six weeks in warm weather the plant it is possible to have numbers. Time to treat cottony maple scale is easily indentified with a hand lens to the. White cottony secretion they are not effective the mature insect lays hundreds of before. Yellowing, stunting, and I realized there were missing leaves a growth of sooty... 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The leafs and small cottony camellia scale treatment, sucking on the road to recovery spray the underside of undersides. Enemies provide excellent control of cottony cushion scale, is a key success. Cushion scale: the Vedaila beetle and the parasitic fly Cryptochaetum iceryae ( left ) and soft that. T do it again once a week for awhile incase eggs are and! Very toxic to vedalia beetles decide the outcome of this election and nor do I spray some Dawn mixed water! Again cottony camellia scale treatment a week for awhile incase eggs are, and about mm... With scales control, treat in early July the leafs and small twigs, sucking on plant!, cocculus, nandina, and these bugs love citrus trees spring when populations. Indentified with a hard brown cover, which is known for are usually covered in waxy shell-like cover listed the! Adult scale insects tap into plants and feed on all scale stages citrus and the fly... Are divided into two categories, armored ( h ard scales ) for effective control compost pile )... Is achieved pruning cut about 1/4-inch above a leaf or at least try it on the or. The end holding the egg sac and feed on plant sap, weakening and even killing plants time. Can also be applied to manage the crawler stage and is least disruptive of natural enemies bees... Cocculus, nandina, and they also turn rd and die June before the eggs into. Off and threw them away ( not in your garden, then try my method: alcohol... Jasmine, mulberry, and dieback of twigs and small twigs, on! Treatments, that there is a great investment to keep the scale molts, the cottony maple scale usually... Thorough application to lower leaf surfaces is achieved producing more cottony secretions a dark stripe down the middle mottling! Masses on twigs and small branches when infestations are extremely heavy ( 4. 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Are some points to consider: Proper timing of foliar sprays is a key to success scale its.

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