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 adults will feed on nearby tree branches until it is time to move to the duff for over-wintering. If you have had damage from White pine weevil in the past - now is the time to take corrective action. The eggs hatch after 10 to 14 days and the larvae will begin to feed as a group, forming a ring around the leader stem as they eat their way downwards, first in the inner bark and then between the wood and the bark. The first sign of attack, though, is the appearance of droplets of resin oozing from tiny feeding holes in the leader stem early in the spring. Korczyński I. Native to North America, the white pine weevil occurs throughout the range of white pine in eastern Canada. Small trees will sometimes die as a result of an infestation. Weevils usually invade homes seeking food or shelter. Apply these products at rates given on the label for bark beetles or borers. Estimates show that the Large pine weevil is causing damages for more than a hundred million Euro per year. Females spend the winter out of sight cooling their six heels in the duff beneath their pine or spruce targets. PINE WEEVIL CONTROL. Professional applicators may use Tempo (cyfluthrin). Cyfluthrin has been shown to be highly effective against white pine weevil in Christmas tree plantations. If larvae are found, remove the entire leader. For More Information This treatment is directed at the overwintered adults to kill them before they lay eggs. or, just the top. Trim the rest of the shoots back to one-half of their original length. The white pine weevil (figure 1) - Pissodes strobi (Peck) (Coleoptera: Curculionidae) - is a native insect attacking eastern white pine (Pinus strobus L.).The latest cytogenetic and breeding studies indicate that two other North American pine weevil species - the Sitka spruce weevil and the Engelmann spruce weevil-also should be classified as Pissodes strobi. BACKGROUND. Weevils: Root Feeding black vine weevil strawberry root weevil. Insecticides (mainly seedling dressing) provide the mainly used method of protection transplant from H. abietis feeding damage. 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 causes extensive damage to many types of evergreen trees. The adults overwinter in the "duff" or debris beneath trees, and in the spring they climb up to the top of the leader (the vertical stem at the top of the trunk) to feed and mate. Damage, control and management of pine weevils. The pine weevil (Hylobius abietis) is a major forest regeneration pest causing high levels of seedling mortality and economic losses.Current management relies on silviculture, stem coatings and insecticides. Weevils: Trunk Feeding Pales weevil Northern root collar weevil *Not established in Minnesota as of 2003 . Damage from white pine weevil can be prevented by spraying the upper trunk and terminals of spruce and pine in early to mid-April and again two weeks later with products that contain bifenthrin, permethrin or cyfluthrin. Forked trunks are created as one or more side branches of the tree assume the function of the dead leader stem. 2001b. Insecticide Names. A single weevil can lay over 100 eggs. Pine weevil Hylobius abietis is the most dangerous pest of restock areas. TreeAzin is not a neonicotinoid and is not from the avermectin family of pesticides. Changing the environment can help prevent or reduce infestations. See below. Heavy feeding results in ring barking and eventual death of the tree. Systemics not only kill adult female weevils as they chew egg-laying punctures in the bark, they additionally can control pre-existing larval infestations. This results in bends in the tree trunk and reduces its value as lumber. Ask an Expert is made up of groups and individual experts. Near the apex of the front wings is a large white patch. It worked out pretty good for the next year. Damage from white pine weevil can be prevented by spraying the upper trunk and terminals of spruce and pine in early to mid-April (25-65 ggd50) and again two weeks later with products that contain either bifenthrin, permethrin or cyfluthrin Cyfluthrin is soid as BioAdvance Vegetable and Garden Insect Spray and you should be able to find it at your local garden or box stores. Large pine weevil is found in all parts of the United Kingdom, and across most of northern Europe and Russia as far south as Armenia and Turkey. Cultural control involves pruning leader below the area where larvae are feeding before July. The adult is a small rust-colored weevil that is about 4-6 mm long. Sap oozing from small holes in the terminals is a calling card of this weevil. It's too late to apply an insecticide against white pine weevil, Pissodes strobi (Coleoptera: Curculionidae), Early to mid-April is the best time to make this application. Larval feeding on the inner bark girdles the leader which causes the characteristic "shepard's hook" appearance of the leader. In Canada, the insect occurs primarily in Scots pine Christmas tree plantations. Effect of selected insecticides on the feeding by large pine weevil Hylobius abietis (L.) on the shoots of pine trees (Pinus sylvestris L.) (in Polish with English summary). This year, I'm applying the same systemic insecticide. TreeAzin is a systemic insecticide produced from Neem tree (Azadiracta indica) seed extracts that is injected directly into the base of trees. If so, should the spray on chemical be applied to the entire tree? Table 1 shows that a few white pine weevil insecticides (acephate, avermectin and oxydemeton methyl) have sys- temic killing action—they move internally in the tree with the sap flow. Some of the most common Canadian weevils include the sweet potato weevil, rose weevil, alfalfa weevil, rice weevil, granary weevil, strawberry and black vine root weevils. Finally, the larvae will build pupal cells in the stem, where they remain inactive for five to six weeks. The following year, I used a systemic insecticide to prevent this from re-occurring. The larval stage, which lives beneath the bark, is white with a distinct brown head. In some areas, the pest is called the Sitka spruce weevil or Engelmann spruce weevil because of preference for these hosts: 1. Eggs are laid in small punctures chewed in the bark and hatch into small, legless grubs in about a week. Spruce 2. http://news.msue.msu.edu/news/article/white_pine_weevil_damage_on_conifers_is_causing_wilted_leaders. A heavy attack will eventually kill the leader. Currently, I have approximately 30 White Pines on my property. For enquiries, contact us. In both cases, insecticide selection depends on the product label. Långstrom B., Day K.R. These beetles are dark brown with white and tan patches on their backs. A shepherd's crook in the new expanding leader is a classic sign that an evergreen tree is infested with the white pine weevil, although other pest attacks may look similar. In western Canada, it attacks mainly the Sitka, white, and Engelmann spruce. See recent articles with pictures about white pine weevil in the MSU CAT Alerts at: http://news.msue.msu.edu/news/article/white_pine_weevil_damage_on_conifers_is_causing_wilted_leaders, https://www.canr.msu.edu/news/control_white_pine_weevil_in_early_spring. Like most weevils, the adult has a long snout-like beak from which small antennae arise. Trees will lose up to two or three years of height growth in the five or six weeks of feeding. In western Canada, its distribution coincides with that of various species of spruce. Be sure to read and follow all instructions and safety precautions found on the label before using any pesticide. Adult weevils are about 8 mm (.31 inches) long. pine weevil, Pisscdes strobi (Peck). It will absorb into the bark of the tree and offer both immediate control of active weevils … Mechanical Control - If excessive pitch is found, cut open the area of pitch exit and look for the larvae. You will not receive a reply. In Quebec, it is occasionally reported in red pine plantations or Eastern white pine hybridization parks. Trees growing in the open without the canopy cover provided by larger trees appear to suffer greater deformation of their trunks. One of the first symptoms of When you prune out the infested leader, make sure not to leave the cut terminals lying in the field because the larvae will continue to develop. They have the characteristic and prominent hooked snout of the weevil. Of just the base? Now other methods are being considered, like the use of natural parasites. The white pine weevil ( Pissodes strobi) of North America kills the central growth shoot of white pine trees, forcing one of the side shoots to take over the upward growth of the tree. Physical barriers of seedlings are also used in some of the European countries. The adult weevils damage seedlings by chewing small holes on the stem above and below the ground. Micro-habitat(s) Bud, Twig, Terminal shoot. There are sporadic Asian records from Kazakhstan, China and Japan, and it has been recorded in New Zealand, but is now believed to be absent there. Also, the product cannot be applied in residential areas, including parks, schools, and playgrounds. In eastern Canada, it prefers the eastern white pine, the jack, Scotch and red pines, and the Norway spruce. Fir (occasionally) Ranging in height from 6' to 45'. Debarking Weevils. The white pine weevil is known to attack many species of pine and spruce, and occasionally Douglas-fir, but white pine is the preferred host. Recommended material include cyfluthrin (sold as Bayer Advanced Yard and Garden Spray), when the adults first emerge from leaf litter in early to mid-April. The standard approach to manage white pine weevil is to spray insecticides in spring so that they cover the terminal. TreeAzin is effective against a variety of insects that consume tree tissues. Timing of the application is critical. It has irregularly shaped patches of brown and white scales on the front wings. Repeated infestations may stunt the growth of trees and also cause deformed or forked trunks, a serious problem for Christmas tree growers. This article was most recently revised and updated by Amy Tikkanen, Corrections Manager. Also, damaged trees are more susceptible to disease, especially heartwood rot. White pine Weevil does the bulk of its damage to trees in the later part of the Spring, but I mention it now because we get the most successful management of this pest with a Fall application of systemic insecticide. Their eggs are laid mainly from late April to early June in small holes made in the bark of the previous year's tree leader. It is also known as the Engelmann spruce weevil and the Sitka spruce weevil. Douglas-fir 4. Adult weevils feed on the bark of young trees used for restocking. White pine weevils produce one generation a year. At present the only product registered to control the white pine weevil is for use on Sitka spruce trees only, and must be applied by a certified professional. 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