Leafhopper & Virginia Creeper
October 31st, 2006 · by Jim Hole
First published October 26, 2006
I was asked one gardening question more frequently than any other this past summer. And it happened to be the question I dreaded answering more than any other: What’s eating my Virginia creeper? It’s a straightforward question and, unfortunately, so is the answer: leafhoppers. However short and sweet my verbal response may have been, I couldn’t help but think we could be on the verge of losing an old friend.

Virginia creeper itself isn’t actually in jeopardy of being eradicated, but its beauty certainly is. Gardeners, including myself have gotten used to expecting buildings covered in picturesque foliage, and now that picturesque foliage has turned it into a denuded labyrinth of branches. As beautiful as the image is of Virginia creeper scaling venerable old buildings, providing a green mass of foliage during the summer and a blaze of red in the fall, the fight involved in achieving that image is too frustrating and labour intensive for many gardeners. Simply put, damage from leafhoppers is extensive and common, and the most effective pesticides for controlling it have been banned for home use.
To understand the threat, you first need to understand the pest. Leafhoppers are small insects that have wedge-shaped bodies. During the fall, adult leafhoppers look for places to ride out the winter, and the old leaf debris that’s fallen to the ground around your Virginia creeper suits them perfectly. By the following spring, adult leafhoppers awaken from their torpitudinous state and the females begin slitting young growth and inserting their eggs into tender twigs and newly emerging leaves. When young nymphs emerge, they feed by sticking their knife-like mouthparts, called stylets, into the vine’s leaf tissue and draw out the sap. If you’re wondering why the leaves look scorched rather than eaten, it’s because leafhoppers are ‘mesophyll’ feeders, meaning they eat only the upper cell layers of leaves.
That’s the leafhopper’s plan of attack; but what’s ours? Well, I could argue both sides of the pesticide debate ad nauseam, but it’s already been waged and won. By choosing not to simply spray and walk away, we also have to accept a smaller selection of plants available to us from what was an already short list of hardy vines.
So what can we do to have it all? Nothing. But we can rethink the problem and start at the beginning. If you’ve had leafhopper problems before, start a control program now. Cleanup the leaf litter around the base of your Virginia creeper before the snow flies; it will reduce the over-wintering population. Next, if you haven’t done it already, give the plants a good last soaking. The next year, keep plants properly watered throughout the summer—drought-stressed plants are much more prone to leafhoppers and will suffer greatly when attacked.
There are some approved pesticides, but timing the applications is critical. Start with insecticidal soap once leaves emerge and continue through the summer with applications every 7 to 10 days. There are a few products that are more effective than soap, but as a rule, start with the mildest control and monitor the results. If soap isn’t working, try a stronger control like Ambush—the timing of its application isn’t as critical and it kills adult leafhoppers, too.

Changing the way we approach problems is never easy, but in the case of pesticides, it’s possible that we’ve indulged in easy for too long. Environmental issues are only going to get more complicated, and when you rely on the easy, you don’t look for better solutions. It’s time to deal. Striking a balance between protecting the environment and manipulating it to suit our vanities won’t be easy, but neither will be looking at a landscape void of our favourite perennials.

