Privet Weevil
Ochyromera ligustri
A small introduced weevil whose adults chew ragged holes in privet leaves and destroy buds, while the grubs develop hidden inside the seeds. It is mainly a cosmetic pest of privet and lilac, leaving plants looking tattered but rarely doing lasting harm.
🔎 How to spot it
The adult is a small shiny brown weevil about a sixth of an inch (around 3.9 mm) long, clothed in golden-yellow hairs with a distinct pale stripe down the middle of the back and a slender snout about a millimeter long. The grub stage lives concealed inside privet seeds and is seldom seen. Look instead for the jagged feeding holes in the leaves and for buds that have been hollowed out.
🥀 Damage it causes
Adults chew irregular, jagged holes in the leaves and often destroy the buds, which forces bunchy, distorted growth and gives the shrub a ragged, tattered appearance. The larvae feed inside the developing seeds rather than on the foliage, so they do not add to the visible leaf damage. Overall the weevil is an aesthetic pest and does not threaten the life of an established hedge.
🛡️ Prevent it
Because the larvae develop inside the seed capsules, shearing off and destroying the flowers and fruits removes the next generation and is the simplest control, which also fits the routine clipping that privet hedges already get. Tolerate light feeding on a vigorous hedge, since the damage is cosmetic.
🧯 If it is already here
Treatment is rarely warranted. Where adult feeding is heavy on a prized specimen, the adults can be targeted in late spring and early summer when they are active, but clipping off the flowers and seed capsules to break the life cycle is the more lasting and least disruptive approach.
💡 Good to know
Adults emerge from the ripening privet seeds beginning in late May and are most common from May into early July, feeding on leaves and pollen at night and favoring wilted foliage; eggs are laid in the seed capsules around the start of July, the grubs develop through fall and winter inside the seeds, and there is one generation a year. The weevil prefers Japanese privet but also attacks common privet, glossy privet, and lilac. It is a separate insect from the twobanded Japanese weevil, which notches privet leaf edges by day.
🌱 Plants it attacks
3 plants in the library can be attacked by this pest
For educational and informational purposes only. Pest control advice is general guidance drawn from university cooperative extension sources; always identify a pest positively and read and follow the label on any product before use, especially around food crops, children, and pets.