They remain on the host tree to feed until the temperature drops in fall, when they seek shelter in the litter to overwinter. If you need to control white pine weevil, your best opportunity is early in spring. Symptoms are usually noticeable by late June. No single control method by itself can provide adequate pest suppression. However, when too many eggs are laid, there is intense larval competition and mortality occurs. Infected ornamental specimens lose their aesthetic value. Grow evergreen trees under a canopy of 50% shade to make the leader shoots less attractive to the white pine weevil. This resin originates from special structures called resin canals found in the bark of the leader. Initially, a portion of the egg population is destroyed by resin. Where habitat conditions are suitable for the weevil, outbreaks develop in pine or spruce regeneration after the overstory is removed by natural (fire, windthrow, bark beetle) or man-made disturbance (harvesting). A basal soil drench with imidacloprid at this time may be too late to protect against white pine weevil this year. Weevils that are notorious for debarking pine seedlings are the pales weevil and the pitch-eating weevil. To emerge, the adults chew small round emergence holes through the bark. Each time a female weevil makes a feeding wound on the terminal, she lays one to four eggs in the wound. How can I prevent weevils invading? Winter mortality due to poor litter quality and ground predation was also observed in jack pine plantations. White Pine Weevil Damage. 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. Insecticide should be applied to the terminal leader once it begins to warm up, somewhere around 25 to 65 growing degree-days base 50. The larvae are white, legless, C-shaped grubs with a medium brown head and several long, silken hairs on the body. Destruction due to a white pine weevil is very distinctive. First a few trees are attacked, then the population grows rapidly, resulting in rates of 20-50% of trees attacked per year. 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 rapid increase in this initial stage is due to the large proportion of trees available for attack and to the fact that many attacks result in multiple leaders. The first symptom of weevil attack is resin oozing from small (0.5-1.0 mm) feeding punctures in the spring. The leader is eventually killed. Infected leaders should be cut back at the level of the topmost whorl of unaffected branches. Small oviposition punctures covered by blackish fecal caps can also be seen, usually near the top of the previous year's leader.Tree mortality due to the white pine weevil is rare, however. The white pine weevil has only one generation per year, but the adults can live and continue laying eggs for several years. An alternative treatment is basal application of imidacloprid (Bayer Tree and Shrub Insect Control) at the rate given for borers. Chemical Control (Planning Ahead) Conifers may be protected against white pine weevil in two ways: by spraying the tops of the trees in early spring or by making a fall application of a systemic insecticide. The white pine weevil has only one generation per year, but the adults can live and continue laying eggs for several years. The adult is a small rust-colored weevil that is about 4-6 mm long. This insect was first described in 1817 by W. D. Peck, a professor at Harvard University. When mature, the larva is approximately 7 mm long, legless, and sli… The adult weevils overwinter on the ground, protected and insulated by the litter (fallen needles). The adult weevils damage seedlings by chewing small holes on the stem above and below the ground. Indeed, early detection is the most effective way of preventing outbreaks. Adult weevils are brown with white spots; they occur in spruce and pine ecosystems throughout Canada. The white pine weevil may significantly hinder the growth of young trees. Studies have shown, however, that in Norway spruce, the impact on volume productivity can be negligible when the trees reach commercial size. Effective management of the white pine weevil requires an integrated approach that ideally brings together biological, horticultural, and mechanical pest control methods with the judicious use of insecticides. During the summer, predation by larvae of the fly Lonchaea corticis may cause the death of up to 85% of the new generation. Adults overwinter in the forest litter and, in early spring, they emerge when the temperature rises to 2-4oC. Near the apex of the front wings is a large white patch. Centipedes. It’s better to be a bit early than to be late with this application. 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. Physical control The white pine weevil prefers open-growing trees 1.5 to 8 m (6 to 25 feet) tall, in sunny locations. Debarking Weevils. Weevils also disperse by flying on warm sunny days. The weevil must lay a sufficient number of eggs to overcome this resin defense and to form an effective "feeding ring", which girdles the leader. Description. Overwintering mortality of the weevil is considered a key factor in the reduction of the weevil population in white pine plantations. They crawl up the trunks of nearby host trees to the terminal shoot and begin to feed before mating. If you need to control white pine weevil, your best opportunity is early in spring. How can I prevent weevils invading? MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. 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. Check out the MSU Landscape and Nursery Management Certificate Program! Damage from the pest was first reported in the early 20th century in eastern Canada. pine weevil control (Table 1). The pales weevil, Hylobius pales, (Figure 14) prefers loblolly, shortleaf, pitch, and white pine seedlings. This usually coincides with the ripening of wild raspberries around mid-July. Check for weevil grubs in stored food, Monitor grains for mould and humidity, Choose insect-resistant foliage and trees, Store food in tightly sealed containers.

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