For the last few weeks, orange striped oakworms have been raining on my head as I work in the trees. They also drop a lot of
poop (entomologists call it frass) which is one of the major complaints by homeowners. Orange-striped oakworms congregate on branches to feed every year in late summer but usually do not cause enough damage to warrant treatment.
Young orangestriped oakworms are often light in color and darken as they get older. I have found some parasitized individuals, which means natural enemies are doing their part to reduce oakworm outbreaks. Caterpillars also make great food for birds. We have posted previously about orange-striped oak worm biology and management if you want more information.
Nursery growers have been struggling with ambrosia beetles for decades. In the southeast it is primarily the granulate
Camphor shot borer. Photo: Matt Bertone, NCSU
ambrosia beetle, Xylosandrus crassiusculus. In the Northeast and Midwest the predominate species is Xylosandrus germanus. These are tiny beetles that make tiny … Continue reading
If you haven’t met tuliptree scale, Toumeyella liriodendri, its high time you did. I found dense
Tuliptree scale on tulip poplar. Photo: SD Frank
patches of it at a local playground the other day. I was tipped off by honeydew, which can mean tulip poplar aphids, but also … Continue reading
Scientific American is reporting from Reuters that Home Depot, BJ’s Wholesale, and other smaller retailers will soon require vendors to label plants that have been treated with neonicotinoid insecticides. Neonicotinoids are among the most commonly used insecticides on ornamental crops and … Continue reading
Hyperaspis binotata is an important natural enemy of soft scales in eastern US. It particularly came to the attention of researchers trying to control terrapin scale on orchard trees in the early 20th century. It feeds on lecanium scales, Pulvinaria … Continue reading
Maple spider mites (Oligonychus aceris) are common and damaging pests of maple trees throughout the Eastern United States. These spider mites overwinter on the trunk and
branches of maple trees and migrate to the underside of leaves in the spring. Once there, they use their mouthparts to pierce leaf cells and feed on cell sap. This causes fine flecking called stippling and eventually leaves turn gray or brown after heavy feeding. Maple spider mites have multiple generations per year which enables them to become quite abundant during a single season. These pests are a more serious problem in nurseries due to the close proximity of potted trees and applications of broad spectrum insecticides like permethrin. For example, our research has shown….continue reading….
This week we noticed some major pest infestations on pyracantha bushes around campus. The most noticeable is woolly apple aphid infestations. These produce cottony fluff along the branches.
Woolly apple aphids. Photo: S.D. Frank
When you brush away the fluff (really it is wax the aphids produce) you will see hundreds of pink or grey aphids crawling around. Woolly apple aphids have been out for a month or so now but are becoming very noticeable now. Infestations for multiple years produce large leafless patches on bushes. The aphids cause galls to form on branches and branches become black from sooty mold. Soap or oil should provide some control but other aphid management information is here.
The other pyracantha pest that just started hatching is hawthorn lacebug. The major landscape plants that hawthorn lacebugs feed on are pyracantha, service berry, and cotoneaster. Lacebugs management information is here. Imidacloprid will kill both pests but should n
e be used on plants that are flowering or that will flower soon due to negative effects on pollinators.
For more pest updates on these and other pests follow @OrnaPests on Twitter or keep an eye on the ecoipm.com blog from North Carolina State University.
Cottony Maple Leaf Scale is one of several cottony scales in the genus Pulvinaria. You can find these now on their most common hosts: maple and dogwood. Stand under a tree and look up and you will see cottony masses about the size of a cotton swap stuck to the bottom of leaves. These are the egg masses. They each contain many hundred eggs that are hatching as we speak. The crawlers will settle and feed on the leaves all summer then migrate back to branches in fall before leaf-drop. For more pest updates follow @OrnaPests on Twitter or keep an eye on the ecoipm.com blog from North Carolina State University.
Looking up at the bottom of red maple leaves notice the many white cottony egg masses. Photo: S.D. Frank
Cottony maple leaf scale ovisac. Photo: S.D. Frank