The white substance is all over the bark of the Bush almost as if someone has painted all of the branches White. Remove all the spent flower heads promptly as well. Purplishred crawlers. This insect is often confused with white peach scale and is a serious pest on Prunus. It is unattractive but in our climate is rarely serious. I urge you to do this because some fungal infections are lethal and some are not. My lilac—a very hardy disease resistant variety—is growing near a bunch of ancient, inherited ferns, and anytime the ferns try to grow anywhere near the outskirts of the lilac, the wussy plant gets a white moldy coating on the trunk. ---Linda in West Chester A. In our area the most serious lilac problems are powdery mildew fungus (Microsphaera alni), lilac borer (Podosesia syringae) and scale (oyster-shell scale, Lepidosaphes ulmi and prunicola scale, Pseudaulacaspis prunicola). The crawler (first instar nymph) stage of this scale insect is w… Don’t have a shell, instead they secrete a cotton-like or waxy substance over their bodies for protection 5. Holly infested with white prunicola scale. How to Treat Scale on Shrubs. Females lay white masses of 400-500 eggs on the undersides of the leaves. Crawlers of the second generation are active at 2314 3586 [3010 peak] GDD. In addition, never feed a lilac chemical fertilizer or use a wood, bark or root mulch underneath it; both breed disease like mad. Here is a link to a publication on powdery mildew in lilac. The lilac gets a lot of sun—from around 1:30 pm until sunset. Powdery mildew looks like whitish patches dusting the leaves. No one knows why these insects pick specific targets in certain years, but each colony only lives for one year, and successive generations don't tend to return to the scene of the crime. Check plants for live scale infestations. Infestations on apple and cherry as well as peach, are characterized by numerous white scales While you're at it, I would pick up a soil testing kit from the extension and send in a soil sample from around the lilac to check for root rots. Some types of soft scales include lec… Spray the bark at night with an organic repellant, like neem or one of the garlic oil products sold for outdoor mosquito control. Those areas are generating spores and spreading the infection. Do these chores immediately after the flowers have faded and it will improve the following year's flowering as well as help keep the white stuff at bay. White Prunicola Scale (WPS) is a serious pest of Prunus, especially in temperate areas.In upstate NY orchards, Cornell University researchers have reported the presence of WPS, which seems to be a closely related species of White Peach Scale (Pseudaulacaspis pentagona) found in the southeastern United States.The WPS is more common in temperate climatic zones. Try to take leaves, infected twig or branch bearing leaves, and even a bit of root if you can get at it. 1). Normally, the only care they need is pruning to keep them within bounds. And finally, don't worry about this becoming a regular problem. CL.= Common Lilac Taxus Mealybug (N 246-618)* ... White Prunicola Scale (C 707-1151)* Nantucket Pine Tip Moth (A 737-1417) San Circular Hemlock Scale (C 737-1413)* Leaf Hoppers General (A 618-1544) Azalea Bark Scale (E, C 737-989) INSECT DEVELOPMENT TIMING CHART 2). Free Shipping on Orders of $75 or more (excludes overweight shipping). White prunicola scale is a fairly common problem on cherry laurels. That'll keep the hornets away while still letting light and air reach the plant. White prunicola scale (Pseudaulalacaspis prunicola) is an armored scale insect that infects members of the Prunus species, and various other ornamental plants.It is one of the most significant pests of cherry and peach trees. The white prunicola scale that lives on the stems of lilac is also found on privet, a lilac relative, and on Japanese flowering cherry. There is no need to remove the lichen from the tree. Some sources feel they also feed on the sap that flows as a result of their peeling. In our area the most serious lilac problems are powdery mildew fungus (Microsphaera alni), lilac borer (Podosesia syringae) and scale (oyster-shell scale, Lepidosaphes ulmi and prunicola scale, Pseudaulacaspis prunicola). Management 3) Oystershell scale, Lepidosaphes ulmi Has a large host range. Lilac flowers can be white, violet, blue, true lilac, A white cottony appearance on trunk, branches, and even twigs is a giveaway. A white powdery substance on the top of the leaf and on the twigs is powdery mildew. It is important to remove and bag or burn infected leaves and twigs. Lilac Troubles: White Mold & Bark Eating 'Bees' Q. I've been noticing white stuff on the trunk of my lilac bush. What can I do? the white peach scale was not one but two species. If other plants are blocking that early sun, see if you can prune or remove them. Hosts include lilac, flowering cherries, privet, willow and catalpa. Although there are natural predators, they do not save valuable trees. If so, what can I do? They hung around for a about a week and a half, seemed to devour a lot of bark and then were gone. A. How do we treat it? Lie flat on bark. Powdery mildew looks like whitish patches dusting the leaves. Or wrap it with strips of row cover, sheer curtain, or other gauzy material. Packed between leaf scales of Juniper and arborvitae. As crawlers, they are highly mobile, six-legged, have no protective cover, and are usually smaller than a pinhead. It can be found on a wide range of trees and shrubs. What is White Prunicola Scale? the white peach scale was not one but two species. Here is a link to a publication on powdery mildew in lilac. Cornell Cooperative Extension Suffolk County. 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