And although these insects are a nuisance when they strip bark, they are also very useful predators that eat lots of caterpillars and other garden pests; having a hornet's nest near a garden has been shown to reduce the number of cabbageworms by more than half! White prunicola scale is a fairly common problem on cherry laurels. Carpenter bees do famously hollow out breeding galleries in soft woods like cedar, but they don't strip the bark off of trees. Or even better, use compost tea for the wiping down; that'll remove the gunk and leave a disease-fighting residue behind. It can be found on a wide range of trees and shrubs. Occasionally, I've come home from a summer vacation and 'Christmas in July' has spread to a few leaves as well, so they get pulled off and trashed. Lilac plants often grow and continue to flower for many years even if totally neglected. Most, however, remain under 10 feet. It is important to remove and bag or burn infected leaves and twigs. It is unattractive but in our climate is rarely serious. So try and deter rather than kill them. 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. The lilac—which bloomed its absolute best ever this past Spring—never seemed to suffer any ill effect and still looks great a month later. There are several other fungal diseases that it could be, but now is the time to take a sample to the local Penn State Extension and get the plant clinic to diagnose the problem. Whenthe bump itself can be squashed it is likely to be some othertype of scale. Plant hosts include ash, lilac, willow, maple, apple, pear, plum, cotoneaster, linden, and viburnum. These two Washington, DC area gardeners emailed me within a few days of each other in mid-September; a surprising time of year to have this kind of problem, as wasps and hornets are pretty much done for the season at that point. According to scale authorities, this species Paper wasps and hornets (themselves a type of wasp), however, DO perform this kind of mischief so that they can use the bark as building material for their papery nests. If you have the flowering Cherry, lilac, or privot in your Massachusetts landscape you may notice the White Prunicola Scale (WPS). It can be found on a wide range of trees and shrubs. If you have a Cherry Tree, Cherry Laurel, Red Twig Dogwood, Privet, Lilac, or Euonymus in your landscaping, you should learn about White Prunicola Scale. A white cottony appearance on trunk, branches, and even twigs is a giveaway. This armored scale feeds on a number of hosts including: Acer, Alunus, Aucuba, Buxus, Forsythia, Ilex, Ligustrum, Malus, Prunus, Rhododendron, Syringa, and others. The plants range from 3 feet to as much as 30 feet in height, depending on the age or type grown. Produce a sugary liquid called honeydew 2. In addition, never feed a lilac chemical fertilizer or use a wood, bark or root mulch underneath it; both breed disease like mad. 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. Sorry Linda, but that is NOT a lot of sun, and it's the way wrong kind of sun for a lilac. If you want to be fancy, mix some baking soda into the water you use for your washrag. Adult moths emerge in summer. The female's body color is purple (Fig. It is unattractive but in our climate is rarely serious. Q. I've been noticing white stuff on the trunk of my lilac bush. We have wasp-like bees eating the bark on one of our lilacs. The female is described as being pupillarial. There is no need to remove the lichen from the tree. Background: Pseudaulacaspis prunicola is a polyphagous scale that is reported to feed on plants in 15 families. There are two main groups of tree scale—soft and armored (hard). Normally, the only care they need is pruning to keep them within bounds. Spray the bark at night with an organic repellant, like neem or one of the garlic oil products sold for outdoor mosquito control. It is unattractive but in our climate is rarely serious. Remove some entire older branches down at ground level first, then take out some of the younger branches that are crossing or otherwise restricting airflow. Lilac flowers can be white, violet, blue, true lilac, Scales are easier to manage if you catch them early. (I proved that through a variety of maneuvers that would have had regular hornets stinging me all over.). trademarks are registered trademarks of Gardens Alive! Here is a link to their website. the white peach scale was not one but two species. Powdery mildew looks like whitish patches dusting the leaves. Prunicola scale. They are still wasps, but at least THIS September (true to the timing of the original questions) they were European Hornets on my lilac. ---Linda in West Chester A. Or is this some sort of insect pest? These are big menacing-looking insects that, unlike other hornets, do NOT sting. Both use long, needle-like mouthparts to suck out sap from the host tree or plant.Characteristics of Soft Scales 1. - Prunicola scale occurs commonly on fruit trees.- Scale insects can kill trees over a couple years if not controlled. The oystershell scale is a small (1/20 to 1/8 inch long), elongated, oyster-shaped insect. These pests typically appear in small numbers and reproduce rapidly. Penn State Extension Master Gardeners. If so, what can I do? Sign up today and be the first to know when a new article is posted and when there are special offers too! They hung around for a about a week and a half, seemed to devour a lot of bark and then were gone. Help! A lot of the branches covered with the dreaded white stuff are dead the next spring. Yellow spotting or banding caused by Cryptomeria scale. Shaped like rounded bumps 4. 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 Baltimore County MD shrubs cherry laurel pest insects and mites white prunicola scale submitted 6 months ago. In the five years since, I've learned more about these creatures. Extension Education Center 423 Griffing Avenue, Suite 100 Riverhead, New York 11901-3071 TEL: 631-727-7850 suffolk@cornell.edu After looking at the link you provided on powdery mildew and the pictures that publication contained, I'm not certain that this is powdery mildew. This includes pruning the lilac immediately after flowering every Spring to open up the center and increase the internal airflow. Lilac Troubles: White Mold & Bark Eating 'Bees' Q. I've been noticing white stuff on the trunk of my lilac bush. Numerous species of scale insects, typically classified as soft or armored, can attack a broad array of shrubs. Although there are natural predators, they do not save valuable trees. When honeydew falls from a tree, leaves shouldbe inspected for live soft scales or mealybugs. The white, oystershell-shaped scale can completely cover needles causing plant discoloration, needle yellowing, and even branch death. Every year a white flaky substance appears on the trunks and branches, as well as a white coating on many of the leaves. Small holes in the scale covers indicate that tiny parasitoid wasps have been active to help control this pest. 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). And yes, they were stripping the bark from my lilac this year. Pine Needle Scale is probably the most common armored scale found on conifers in the United States and Canada. This scale settles on the needles of its host and forms a 1/8-inch white, oystershell-shaped cover. And finally, don't worry about this becoming a regular problem. Lilac Troubles: White Mold & Bark Eating 'Bees' Q. I've been noticing white stuff on the trunk of my lilac bush. Management 3) Oystershell scale, Lepidosaphes ulmi Has a large host range. 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