Studies have shown, however, that in Norway spruce, the impact on volume productivity can be negligible when the trees reach commercial size. Eastern white pine, Engelmann spruce, jack pine, Norway spruce, scots pine, Sitka spruce, white spruce, Larvae into a terminal shoot of eastern white pine, Eggs in their natural position into a terminal shoot, Holes chewed by an adult in the stem for feeding and egg-laying, Appearance of a damaged terminal shoot on Norway spruce, Abnormal eastern white pine terminal shoot attacked, Abnormal terminal shoot on eastern white pine attacked par white pine weevil, Trees, insects and diseases of Canada's forests, Simple steps for controlling the white pine weevil, A simple effective tool for controlling white pine weevil and blister rust on Norway spruce and eastern white pine. No single control method by itself can provide adequate pest suppression. Once they warm up, the weevils move up to the tops of the trees in late afternoon or early evening and feed on the terminal leader. In the springtime, female weevils begin laying eggs and feeding on branch tips at the top of their favorite tree hosts. The white pine weevil has only one generation per year, but the adults can live and continue laying eggs for several years. Adults overwinter in the forest litter and, in early spring, they emerge when the temperature rises to 2-4oC. In British Columbia, it hinders the regeneration of Sitka spruce, white spruce and Engelmann spruce and is considered a major pest of most other species of spruce. Although it occurs naturally in our forests, in eastern Canada, it is considered to be the most serious pest of white pine, jack pine and Norway spruce plantations. PINE WEEVIL CONTROL If you have young pine trees and want to ensure they don’t get targeted by pine weevils or other wood borers, spray them each spring with MAXXTHOR EC. The white pine weevil may significantly hinder the growth of young trees. To be most effective, apply applications in October, March or early April to allow time for tree roots to absorb the insecticide and move it up into the tree. The lateral branches on the whorl will compete for apical dominance. Like most weevils, the adult has a long snout-like beak from which small antennae arise. Insecticide should be applied to the terminal leader once it begins to warm up, somewhere around 25 to 65 growing degree-days base 50. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. An alternative treatment is basal application of imidacloprid (Bayer Tree and Shrub Insect Control) at the rate given for borers. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Near the apex of the front wings is a large white patch. Protection of seedlings with chemical insecticides for up to two years after planting. MSU is an affirmative-action, equal-opportunity employer. White Pine Weevil Control Tips Attacks white pines, spruces More common in pure plantings Adults emerge in early spring when T > 50 F (as early as March in PA), Treat in early spring when adults emerge with borer pesticide Mechanically remove Shepard’s Crooks before August 1. They remain on the host tree to feed until the temperature drops in fall, when they seek shelter in the litter to overwinter. These extra leaders increase oviposition sites and food supply. How can I prevent weevils invading? Weevils also disperse by flying on warm sunny days. With the years, the insect became very common due to the increased number of plantations and the absence of control methods. Weevil adults could feed on the terminals for three weeks or perhaps longer. Debarking Weevils. To emerge, the adults chew small round emergence holes through the bark. Infected leaders should be cut back at the level of the topmost whorl of unaffected branches. pine weevil control (Table 1). Damage from the pest was first reported in the early 20th century in eastern Canada. An alternative method for pine weevil suppression is the application of entomopathogenic nematodes to tree stumps harbouring developing pine weevils. For more information, visit Damage was variable, depending on the region. To truly end your weevil infestation, you will need to the help of a professional pest control service. To contact an expert in your area, visit, or call 888-MSUE4MI (888-678-3464). They will feed in the phloem under the bark for several weeks, pupate and then emerge as new adults around mid-summer. To have a digest of information delivered straight to your email inbox, visit Gradually, by plantation age 30-40 years, this equilibrium gives way to a population decline phase, in which the rate of attack drops to about 5% per year. Weevils also disperse by flying on warm sunny days. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. How can I prevent weevils invading? Check out the MSU Fruit and Vegetable Crop Management Certificate Program! Feeding punctures made by the adult weevils can also damage the leader.

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