The insect is sometimes referred to as spruce weevil in the western United States. <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 10 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The infested terminal can be clipped, and a new leader can be trained. Full Menu+. It infests and kills the main shoot (terminal leader) of young trees (Fig. 3 0 obj The resulting grub-like larvae are white, legless, and slightly curved. (Spruce Trees) Terminal Weevil. WPW infestations start in early spring when overwintered females lay eggs just beneath the bark of terminal leaders. The weevil is a small insect found commonly in Bozeman, MT and SW Montana. 1 0 obj (265) Photo: Chuck Cornell Monitoring white pine weevil overwintering adults. Colorado Blue Spruce, Norway Spruce, Serbian Spruce, Scotch and Austrian Pines may also be attacked. Not to be confused with western pine beetle, the white pine weevil infests and kills the terminal leader of young trees. The Spruce Terminal weevil, also known as the White Pine Weevil, attacks the upper (new) growth of evergreen trees (mainly spruces in our area). A closely related species, Pissodes terminalis, causes similar injury to lodgepole pine in Colorado. White pine weevil damage on . One of the mandates of LaRueTree Certified Arborists is to inform people about trees and tree health for the benefit of homes, families and communities. These pictures were taken in Beaver County in early winter of 2016 on a 6-7' tall Colorado Spruce. The larval stage, which lives beneath the bark, is white with a distinct brown head. stream Adult white pine weevils overwinter in litter on the ground. The affected terminals wilt into a ‘shepherd’s crook’ form and the needles often become lighter colored before they ultimately die and drop. White Pine Weevil (Pissodes strobi) is a native conifer pest with a wide host appetite. $��$��q�-V��=���a��@�H�, �Gq���"��˯�7��O����Wq�W��nWipܯ^�AS>����o+�������ۛ_�q��0J�"+ˆ�,?��9Q ��D⌇yʲ< ��"�c��q���ʒe)�5�Y�D�L" ��"��H��ᨯ"Rx��)Ks�5DJ����6���%��=h�~�����Ԍ�F��1ĥpw/K�����-�f圷��+)�0ք�Ë`�z-�����. Terminal weevils are found on pine and spruce throughout most regions in British Columbia. The white pine weevil (Pissodes strobi) is often the most frequently discussed weevil pest of eastern white pine, however this insect can also be destructive of blue spruce. x��ZK��8�7���GH�"�^�H:��&�]��9${P�j�[�Jr����b�)�jXLFQ$�^���!���7o�>>���E�����v�맜m�ۛ���p�E�"��'Q� The eggs hatch in seven to ten days. The adult is a small rust-colored weevil that is about 4-6 mm long. White pine weevil larvae kill the terminal leader and the top two to four years of growth on many varieties of spruce, as well as white and Scots pine trees. endobj White pine weevil is indigenous to North America. The white pine weevil often kills 2-3 years of … Like most weevils, the adult has a long snout-like beak from which small antennae arise. ��!�X��a)��x{s�۱��){b���a�||`̢�U$��0�X�1^�H�e�E�p�}:W�! 4 0 obj Its larvae (soft, white grubs without legs) and white pupae are similar to those of the rice and maize weevil. If you look closely at the picture above, you can see the small entry hole where the weevil has deposited up to 100 eggs into the phloem layer of the tree. April - June During this period, adult This young Colorado Blue Spruce tree is showing the telltale symptoms of Spruce Terminal Weevil. Scouting for white pine weevils in the nursery by beating the tree and counting weevils that fall onto a surface. White Pine Weevil “Sitka spruce weevil” (Pissodes strobi) Look For: Damage is first noticed in the summer when the spruce terminal suddenly yellows and eventually loses its needles and turns brown (Figure 1). Indeed, the WPWs love of spruce is exemplified by its alternate common name, Engelmann Spruce Weevil. The lodgepole terminal weevil attacks and kills the current year’s terminal growth on immature trees 2 to 7 m high. 1), causing formation of multiple trunks and bushy-topped trees. Larvae from the white pine weevil, Pissodes strobi, has caused damage which has become very apparent in recent weeks. Typical damage to … Pupation occurs in larval chambers made of wood chips. Females deposit eggs in the bark of the terminal growth, which hatch in 7-10 days. Genetic resistance to this insect was demonstrated in early provenance trials in BC. Trees. They can harm tree volume and wood quality by causing stem deformation and height loss. First a few trees are attacked, then the population grows rapidly, resulting in rates of 20-50% of trees attacked per year. (261) Photo: John Davidson Feeding damage inside a terminal caused by white pine weevil. Adults emerge in 10-15 days and continue to feed on old and new growth. Root collar weevils are typically pests of young plantations and can cause mortality by feeding on a tree's root collar. The The adults hibernate in the duff underneath host trees. When mature, the larva is approximately 7 mm long, legless, and sli… Healthy environments are important to healthy communities, and trees play a huge role in healthy environments. <> Removal of the infested part of the tree is important as well as future pruning and training in order to ensure a single dominant leader. These little insects are often found on pine and spruce trees. Non-chemical options: Only the top leader and upper branches of the tree are affected by the insect. Larvae from the white pine weevil, Pissodes strobi, has caused damage which has become very apparent in recent weeks. overwinter in leaf litter and debris around spruce trees. The weevils then chew small pits in the leader and lay their eggs there in May. This young Colorado Blue Spruce tree is showing the telltale symptoms of Spruce Terminal Weevil. The lodgepole terminal weevil, Pissodes terminalis Hopping, feeds in the current year’s terminal growth causing dieback, height growth loss and consequent deformity in the main stem. Management: blue spruce. It makes its living by residing in the very top of your spruce trees. The larvae of white pine weevil are white, legless, and approximately 0.3 inch long when fully grown. Eastern white pine and Norway spruce appear to be two of its preferred hosts, although other pine and spruce, and Douglas-fir, are also suceptible. At about 1/4 its body length, the granary weevil's long snout extends down from its head. 1. The damage to the phloem layer is visible in this cross section of the terminal leader after it was pruned off of the tree. A closer view of the leader of this little spruce tree shows the entry site of the Spruce Weevil into the phloem layer of the terminal shoot. It has irregularly shaped patches of brown and white scales on the front wings. endobj Prune out dead infested branches and destroy the branches. 2 0 obj The white pine weevil is a native North American insect that poses a serious threat to spruce and pine trees across the continent, mostly in the northern US and Canada. %���� Its coloring is similar to the rice and maize weevils: reddish brown to black. In late spring, new growth wilts and dies back. 3. Normally, we begin to see the first symptoms the end of June to the first part of July. Near the apex of the front wings is a large white patch. This insect kills the terminal leader of Eastern White Pines. It will feed on white pine and spruce, causing the top terminal lead to die, which can disfigure an ornamental tree. Eastern white pine is the insect’s preferred host, though infestations have also been reported on various other pine and spruce trees. (Moench) Voss) plantations in British Columbia (BC), Canada. Although the weevil rarely kills an entire tree, it usually kills the terminal shoot and top one or two whorls of branches. Clean up duff around spruce … Blue spruce white pine weevil has one generation per year. White pine weevil adults chew holes to feed on leaders near terminal buds causing pitch flow. In late spring to early summer, weevils become active and seek out spruce trees. The White Pine Weevil prefers to attack trees exposed to direct sunlight. Further info can be obtained by calling LaRueTree Certified Arborists, Inc. And remember to look for the ISA Certifified Arborist designation when contacting a reputable tree service. If the terminal leader of a Colorado blue spruce is brown and crooked like a cane, pull back a piece of the bark. As we begin this new year, I came to the realization that my informative blog posting has been lacking. They favor feeding on bark 7-10” below dormant terminal buds. The presence of chip cocoons is diagnostic for white pine weevil. Lodgepole terminal weevil, Pissodes terminalis 22 Mammal damage 22 Spruce Pests 22 Spruce beetle, Dendroctonus rufipennis 22 Two-year-cycle spruce budworm, Choristoneura biennis 23 Spruce weevil, Pissodes strobi 24 Alpine Fir Pest 25 Western balsam bark beetle, Dryocoetes confusus 25 Western Hemlock Pest 25 Injury by white pine weevil is almost entirely limited to higher elevation areas of the state and foothill areas. (\�ы Eastern white pine is the insect’s preferred host, though infestations have also been reported on various other pine and spruce trees. From April to May, they emerge and begin feeding on terminal growth. Its host range includes Scotch, jack, red, pitch, and eastern white pines as well as Douglas-fir and all spruces. White pine weevils overwinter as adults in litter beneath host trees. Train a new leader from a lateral branch. Larvae of the white pine weevil kill the terminal leader and the top two to four years of growth on many varieties of spruce, as well as white and Scotch pine trees. This insect is sometimes called the lodgepole pine terminal weevil.The white pine weevil (Pissodes strobi) produces a conspicuous injury t… The larva will then tunnel around the terminal leader, eating the phloem tissue and girdling the terminal shoot. White pine weevil is a common pest in this area, but its damage is mostly cosmetic. Legless larvae (grubs) feed on the inner bark and cambium layers that produce tree growth. Photo by Laurie Kerzicnik. Adult weevils fly to the terminal shoots of host trees and feed on bark tissue. endobj <>>> by W. Cranshaw The white pine weevil (Pissodes strobi) produces a conspicuous injury to the terminal growth of spruce trees. Feeding and Larval mining on and in the terminal leader of the tree does not cause mortality, but causes unsightly growth and structural defects. 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