Viburnum Leaf Beetle reaches New York City

Viburnum Leaf Beetle, Pyrrhalta viburni, has been confirmed in New York City this Spring:

John Jordan, Natural Resources Supervisor at Prospect Park Alliance has found evidence of the beetle there, and says that there was a confirmed report on North Brother Island (between Manhattan and Queens) last year. VLBs are suspected to be in some of the larger parks in the Bronx, northern Manhattan and northern Queens.
Viburnum leaf beetle invading NYC?, Cornell Horticulture Blog, 2009-05-22

Damage caused by feeding larvae. Photo: Paul Weston, Cornell

Unfortunately, my recently transplanted Viburnum dentatum is one of the highly susceptible species. When I left yesterday morning to attend Chicago Spring Fling, it was still in spectacular bloom, covered with white flowers. I would hate to lose it; it’s the largest plant I have, except for the cherry tree. I haven’t noticed any feeding damage, but I will examine it closely when I return, now that I know what to look for.

Damage caused by feeding adults. Photo: Paul Weston, Cornell

The viburnum leaf beetle, Pyrrhalta viburni (Paykull), is an invasive, non-native beetle that first appeared in New York along Lake Ontario in 1996, and has steadily spread. It is a voracious eater that can defoliate viburnum shrubs entirely. Plants may die after two or three years of heavy infestation.

Hat tip to @AboutInsects

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Related Content

Viburnum dentatum, Arrowwood, 2009-04-20

Links

Cornell VLB Home Page
Viburnum leaf beetle invading NYC?, Cornell Horticulture Blog, 2009-05-22

Viburnum dentatum, Arrowwood

When we moved to our new home in Flatbush four years ago, my garden moved with me. Rather, the plants from my garden. All were planted hurriedly, with the intent of moving them “later in the season.” In some cases, “later” has become four years later. Case in point: Viburnum dentatum, Southern Arrowwood. (Some botanists recognize a separate species, V. recognitum, Northern Arrowwood, for variants with smooth twigs.)

Viburnum dentatum, before transplant

Very handsome, but not what I thought I had acquired. This individual was supposed to be V. dentatum ‘Christom’ (Blue Muffin®), a dwarf cultivar reaching 4-5 feet in height and 3-4 feet in breadth. (The species is highly variable, height can range from 3 feet up to a maximum of 15 feet.) It’s now over 6-1/2 feet high and has extended across the narrow concrete path at its feet. So I can be forgiven some poor planning on my part that the plant has far exceeded its expected bounds.

I needed to move it from this location because it was blocking the path. However, in this location it was doing an excellent job of screening some “necessaries”: cans and bins for garbage, recycling, and composting. And that suggested I could solve two problems at once by transplanting it to the backyard to screen the gardener’s nook from the street.

Folks walking by on the sidewalk get a straight view into this corner of the backyard. I want this to be an intimate, sheltered location.
View to gardener's corner

When I did the garden design for my backyard, I doubled the depth of the bed along the north edge of the property, visible on the left of the photo above and the plan below.
Final rendering, backyard garden design

Earlier this season, I executed that part of the plan. On the right, the gardener’s nook is located where the deck will extend to accommodate a bench, as shown on the upper left of the plan above.
Gardener's corner

I transplanted the Viburnum to roughly the location indicated by the shrub marked “L” in the plan. I had specified Lindera benzoin, which I don’t have, for that location, but the Arrowwood should do as well there. You can see that it does a great job of screening the view, even though it hasn’t fully leafed out yet. During the summer, the nook will now be completely shielded from the street.
View to gardener's corner, after transplant

It also dramatically changes the character of the space. Compare these before and after shots. The backyard now has a sense of enclosure it didn’t have before, even within the parts of the backyard that are not visible from the street. This validates a key strategy of the design: enclosing the space with shrubs to create the feeling of being in a woodland garden.

Before
Before transplant, lateral view

After
After transplant

Related Content

Woodland Garden Design Plant List, 2009-02-18

Native Plant Profiles

Links

Viburnum dentatum

Connecticut Botanical Society
MOBOT
NPIN
OSU
PLANTS
UConn
UIUC
VT

V. dentatum ‘Christom’

MOBOT