Dear Employers and Business Owners,
Platte County School District #1 receives federal grant money through the Wyoming Department of Education for the Perkins Career and Technical Education Grant. This money is used to support our Career and Technical Education programs in all our high schools. As part of our effort to continually improve, we are asking the Platte County Employers to fill out this quick survey. The survey results will be shared with the teachers, school administration, school board, and the Chamber of Commerce. Please feel free to call me with any questions or concerns regarding this survey. Thanks so much!!
Tracy de Ryk
Perkins Grant Coordinator
307-322-2075 ext. 5031
Fig 2 – Larvae of Agrilus cuprescens, weaken the canewhich may break spontaneously. (James W. Amrine Jr., West Virginia University, Bugwood.org)
Rose stem girdler, a new pest of cranberries & roses
Jean R. Natter
As insects go, rose stem borers, Agrilus cuprescens, (Fig 1) are small metallic beetles in the Family Buprestidae, about a 1/4-inch long when mature. This imported European species attacks two favorite garden plants: Roses and cranberries. Their larvae bore into the stems, eventually girdling them. The growth beyond that point wilts and dies. (Fig 2)
The older name, Agrilus aurichalceus, is still used in various resources. Other common names include bronze cane borer, cane fruit borer, and raspberry borer.
Facts about borers
Before we delve into further details, we need to understand that all insects that bore into plants behave similarly. For rose stem borers, it’s essentially this:
“Flatheaded borers are larvae of a remarkable group of beetles known as buprestids or metallic wood boring beetles, so named for their luminous, metallic exoskeletons. While the adults levy no particular offense other than to nibble a few leaves, their youngsters are real trouble makers and some of the most devastating pests of woody plants.” (http://bugoftheweek.com/blog/2013/1/2/gnarly-roses-rose-stem-girdler-agrilus-aurichalceus)
Here in the northwest, we’re already familiar with another small
invasive buprestid, the Bronze Birch Borer (Agrilus anxious). They inflict
serious damage and, often kill, stressed birch trees by girdling them,
thereby disrupting the flow of the phloem and xylem. (Details at
“Bronze Birch Borer” -
As you might suspect, hosts of rose stem borers include roses, but also certain other members of the rose family, among them cranberries commonly grown in home gardens, including both raspberry (red and black) and blackberry. Affected roses may be wild or cultivated kinds.
Affected canes develop a gall (enlargement) at the feeding site which dries, weakens and may break. (Figs 4, 5) Fruit production may decrease. Cranberry plants with normally lush growth may die.
Management of rose stem girdler in Oregon is currently limited to cultural methods. Plant in well-drained soil and provide adequate water and fertilizer to avoid plant stress.
Jean R. Natter
Rose Stem Girdler, a new pest of cranberries & roses
When telltale enlargements are seen on the canes, remove them by pruning below the damage, then destroy the pruning’s.
MGs as First Responders
Here’s an important project for you: Help track the spread of Rose Stem Girdler in cranberries and roses.
If you suspect such a diagnosis while volunteering as an MG, or in your own berry patch or rose bed, get images and/or samples. Jot down a history with at least a few known facts, among them the cultivar name of the plants; when the damage was first detected; also, in which town the plants are growing. The most useful images to verify a diagnosis are the entire plant; a view of the affected cane(s); and a cut-away of the affected section.
Next, email the images and history to me (firstname.lastname@example.org). After I verify your tentative diagnosis, I will notify both you and the entomologist. Oh, yes; keep your eyes peeled for this new pest.
Be cautious while researching rose stem borers. Several insects have similar common names which can lead you astray. (It may be risky to trust information that uses only a common name for the pest.) What you can tell clients, with confidence, about the rose stem girdler is that management is currently limited to removing and discarding (or burning, where allowed) the galled cane(s).
“Gnarly Roses – Rose Stem Girdler”
Jean R. Natter Metro MG Newsletter; 2017-11 Rose Stem Girdler, a new pest of cranberries & roses
Here is a great photo of the large hail from GOLF BALL TO TENNIS BALL size associated with the tornadic storm earlier this afternoon in Hartville, WY!
Photo Credit: Kari Young
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