The black vine weevil frequently injures and strips leaves from taxus, Japanese holly, rhodedendron, azalea and euonymus plants.
Effects on the Tree
Look for feeding notches on the edge of the tree needles or leaves. Frequently the notched leaves are on the lower portion of the plant and toward the center.
It is important to keep in mind that adult feeding is an aesthetic type of damage,meaning that there is a more sinister type of damage. Larval feeding can result in yellowing, wilting and death of the plant.
How does this pest attack?
This weevil feeds on more than 100 plant species and is found throughout the northern half of the United States and southern Canada. Homeowners can unknowingly introduce the insect into their landscape by planting infested shrubs or annuals such as primrose or inpatients.
Since they feed during the night, weevils are seldom seen. During the day, they hide in debris on the ground or in the soil. One generation occurs each year with adults emerging early June and mid-July.
Management and Monitoring
We recommend two or three insecticide applications starting in mid-June. Treatment can reduce adult numbers and thereby prevent eggs from being deposited. This will reduce the likelihood of plant loss or root damage.
It is also beneficial to monitor for weevils around your yard. Weevils hide under debris during the day. One way to determine if the pest is in your yard is to place a piece of plywood or burlap in the scrap pile or mulch of the host plant and check underneath it in the morning for hiding weevils.