Smooth hydrangea (Hydrangea arborescens) is a wonderful native hydrangea that is the host for the stunning hydrangea sphinx moth (Darapsa versicolor). However, these caterpillars aren’t the only ones who enjoy this shrub…
At this time of year, close inspection of your hydrangea may reveal the unmistakable signs of the hydrangea leaftier moth (Olethreutes ferriferana).
The unique, purse-like structures are crafted by the caterpillars at the tip of a branch. Applying silk to the edges of a leaf, the larvae tie two leaves together to create a private booth where they can dine on the flower buds and tender leaves. Upon opening one, you’ll spot the tiny caterpillars with their shiny black head capsules, munching away.
Fortunately for your hydrangea, there’s only one generation per season, so no additional nests will appear throughout the summer. Damage caused by these insects is usually only cosmetic, and does not usually affect the overall health of the shrub. And once the caterpillars have moved on, the nests are often occupied by new tenants such as spiders– beneficial insects who help us by preying on other pests in our pollinator garden.
