hemlock looper damage

0000003348 00000 n Damage. ... Damage Symptoms and Population Limiting Factors. Bruce Hostetler. 18 Elkins Lane 0000003591 00000 n 0000009776 00000 n The District of North Vancouver (DNV) says that it’s an outbreak of Western Hemlock Looper Moths, a native species that’s “part of the natural coastal forest system.” The district addressed the issue in late August, saying that they had received inquiries from the community about the potential impact they could have on the region. After an outbreak of western hemlock looper moths last fall in Metro Vancouver it appears they have returned and in greater numbers. 0000036543 00000 n Hemlock looper damage usually occurs in mature stands where severe Hemlock would be more likely to suffer permanent injury than other species. Augusta, ME 04333 Significant tree mortality occurs in stands that lose greater than 90% of their foliage. H�lU�nA����>&L�7�ϏEB�KrC�#,RR^ ����3=���Lո�^ʞ�_|~�d���=��,�'��x The western false hemlock looper is a relatively uncommon forest pest in Region 1. These Although the color intensity may vary widely within the species, most moths are basically dark straw yellow with a variable dusting of tan or brown to brownish purple scales. Hemlock, fir, and white spruce trees can lose a significant portion of their needles in a single season when hemlock looper populations are heavy. conditions. The need for control would be based on desired results (aesthetic or simply protection) and previous defoliation or stress. ��c�\Y�$&���Vْ)xvN�\#�K PI��Ў�_��� �0��m��@� �WbbPq�Di0p1p8��� 5��L�03�j�i`�a� ��� Count the number of larvae on the sheet. 0000008048 00000 n Should native fir and/or hemlock in the adjacent area be heavily defoliated and larvae be found in monitoring checks, growers should seek more advice. 0000002060 00000 n 0000012179 00000 n Larvae at this point are still small (less than 1/2" long). DACF@Maine.gov, Department of Agriculture, Conservation and Forestry, Forest Insect & Disease Conditions Reports, What's ailing my tree/shrub/forest report form. After hatchi ng, l arvae i nit ial ly feed on the current year’s growth and t hen move to feed on the older needles. Although hemlock looper damage can be expressed in terms of wood volume loss, other less readily quantifiable values should also be taken into consideration, including landscape quality, recreation and tourism potential, and environmental quality in outbreak-affected areas that are home to Trees that lose more than 70% of their total needle compliment usually experience long term effects such as branch, top, and even some tree mortality. Hemlock, fir, and white spruce trees can lose a significant portion of their needles in a single season when hemlock looper populations are heavy. Caution - For your own protection and that of the environment, apply the pesticide only in strict accordance with label directions and precautions. 0000038984 00000 n Bureaus & Programs → Maine Forest Service → Forest Health & Monitoring → Insect & Disease Fact Sheets → Hemlock Looper. Hemlock looper damage is visible on conifers during epidemics in late July and early August. 0 The larger larvae are very messy feeders, moving about "nipping" foliage (which later dies) and, when disturbed, dropping from the trees onto undergrowth where defoliation is often heaviest. In heavily infested stands it is not uncommon to find large numbers of moths resting on trunks of trees and on low deciduous vegetation. iscellaria lugubrosa (Hulst) (Lepidoptera: Geometridae), is a destructive defoliator of its primary host, western hemlock Tsuga . January 2001, Department of Agriculture, Conservation and Forestry Western hemlock looper adults at rest on Douglas-fir. 0000301943 00000 n 0000011356 00000 n Outbreaks of the species, known for decimating hemlock and other types of trees, are a natural phenomenon but may increase in frequency in the future because of the climate crisis, say experts. Small, localized infestations of hemlock woolly adelgid (HWA) were recently discovered in western lower Michi… The larvae go through a series of four molts, changing with each molt. P596. Western hemlock in the interior is intolerant to defoliation so mortality can occur following only one year of heavy defoliation and may continue for up to four years after the collapse of a western hemlock looper infestation. 0000058000 00000 n Needles damaged by feeding larvae dry out, turn red and drop in the fall. <<7d58ab741c86b94f99f3c63ecbff4fcb>]>> Environment Canada, Computers and Applied Statistics Directorate. The effects of western hemlock looper on a range of ecosystem features have not been well documented. For growers of Christmas trees and wreath brush it is necessary to achieve a more rapid control of such defoliators than usually achieved by B.t. 0000039045 00000 n 0000003392 00000 n 0000040093 00000 n 0000046937 00000 n The most severe damage usually occurs in extensive stands of old-growth trees. 0000000016 00000 n 0000003718 00000 n 0000103627 00000 n 0000004338 00000 n Hemlock Looper outbreaks rarely last more than three or four years; the infestations are noted for their rapid escalation and sudden collapse with very high levels of defoliation and associated tree mortality. It is a serious pest of balsam fir in Quebec and the Maritime Provinces of Canada. 0000097035 00000 n Hemlock, balsam fir, and white spruce are most at risk. Western Hemlock Looper Darci Dickinson . 0000014930 00000 n The trees turn a reddish colour, which is very characteristic of hemlock looper outbreaks. Remember that these early larvae are tiny (see description). 0000430455 00000 n B.t. 0000037510 00000 n 0000004492 00000 n 0000030029 00000 n 0000090488 00000 n It is critical that you have early detection for looper if you plan to use B.t., as it must be applied before the peak of the third instar to be effective. 0000035449 00000 n [1] It is thought that their populations crashes may be due to the build-up of parasites, predators and diseases, which act as natural biological controls. Heavy looper populations can kill conifers in one season but usually mortality occurs in stands defoliated for several seasons. Trees that lose more than 70% of their total needle compliment usually experience long term effects such as branch, top, and even some tree mortality. 0000002140 00000 n Hemlock loopers play "possum" and often will not move for a minute or two. %PDF-1.5 %���� moths. Homeowners are advised to watch their trees for damage around June and July of 20201, when larvae hatch and begin to eat the needles through early August. Eggs overwinter on tree trunks, laid on bark lichens or moss. Five to ten larvae per sample could produce noticeable feeding damage in the current season. x�b``f``�����ֹ����X�X8000 Use the population assessment described below to determine if and when there are enough larvae present to warrant control. 0000006351 00000 n hemlock looper can cause tree mortality on western hemlock." Deciduous hosts are much less affected by looper and rarely experience significant damage. The variable, brown and green, spotted pupa has no cocoon and is formed in cracks and crevices on the tree bole, objects nearby or in the litter. trailer Hemlock looper populations can rise dramatically and tend to stay high for 2-6 years before subsiding. Once damaged, needles usually die. It threatens more than 170 million hemlock trees in Michigan forests, and if not controlled, it will also kill hemlock trees in landscapes. The ground beneath heavily infested trees may also be covered with a mat of "nipped" or partly chewed needles. This insect periodically reaches outbreak levels, causing severe damage to forests in both Interior and coastal stands in British Columbia. All, however, have a broad, distinct and usually lighter band down their back containing paired (4 per segment) dark spots and have a light underside. 0000008895 00000 n Impact & Damage. The only other time it has been reported at epidemic levels in the Region was in 1963 on the National Bison Range near Moiese, Montana. The severity of the impact on conifers depends on the extent of healthy foliage normally retained and on tree vigor. 0000011596 00000 n Western hemlock looper damage. Defoliation during that outbreak was rated as moderate to heavy with from 25 to 85 percent of the needles gone (Tunnock 1964). 0000041432 00000 n Carefully insert the frame into the canopy so that it remains flat and beneath a 3 ft. branch. Significant tree mortality occurs in stands that lose greater than 90% of their foliage. Control decisions for individual Christmas tree plantations should be determined for each situation. The hemlock looper is one of the most destructive defoliators in the province and prefers to feed on mature hemlocks, but it will also attack cedar and fir trees. Stands under 50 to 60 years of age are relatively 41 unsusceptible to looper damage (Anon. 0000011890 00000 n �'��?�W�:h3�0�i2,�`g���� �iF��9���D"X�1Z2������8}��E# �B��F��������L|�� �y�0L :�0���L@l ` ��D� In late July, larvae begin seeking out protected spots to pupate. Eggs hatch from May to early June. can be used for both aerial and ground applications but requires careful timing. Inland hemlock stands were severely defoliated later in the outbreak and some experienced scattered but significant mortality. Western Hemlock Looper. 0000045390 00000 n Alert: Stay up to date on Maine's COVID-19 Response, DACF Home → Western Hemlock Looper (WHL or IDL) The western hemlock looper is a native defoliator of western hemlock, western redcedar, Douglas-fir and Interior spruce. Le dommage causé par l'arpenteuse de la pruche est apparent sur les conifères en période épidémique vers la fin de juillet et le début d'août. Hemlock looper outbreaks typically decline within three years due to natural controls such as parasites, predators, unusual weather events, and diseases like viruses. Figure 1. In the last, or fifth instar, most larvae are roughly 1.25" in length and 1/8" or more across. Ottawa, ON Project No. Coastal hemlock seems much more resilient. The western hemlock looper is a native species part of the natural coastal forest ecosystem that feeds on trees, particularly in the Fromme and Lynn Valley area where the community borders the forest. Mating takes place on resting sites and "coupled" pairs of moths often show different color variations. endstream endobj 54 0 obj<>stream They develop and collapse very quickly, with outbreaks usually lasting between one and two years. Adult moths of the Hemlock looper have a wingspan of almost 1.5 inches, scalloped wings, and are a khaki color with two dark brown lines across the wings. The Western hemlock looper moth, a native species that defoliates trees, is common in B.C. 0000036385 00000 n 0000003547 00000 n Two pair of dark spots are also evident on the top of their head. They are inchworms and … MAINE DEPARTMENT OF AGRICULTURE, CONSERVATION AND FORESTRY but it especially likes to prey on the hemlock, Douglas fir, and red cedar found on the North Shore. 0000013193 00000 n 0000042750 00000 n 35 0 obj<>stream ��K�p��ᚼ:7����Xm�l�N��as^�',�bx=�4��X+�$������j�z�h rI�)\w83�43�c�Kz~�^]��Z`K��+�,��Y�j�P��Ÿ�x4u�;W]>���[�qz���d���޽�ϫ`����(�G��#�B��g���L��:�����b�ք+V�v��ԡ��t���Y�����G���K+u줡�-%/l�9�./���o�D��{G��)�^I��,s�m��f�&Ajb-�x���u*�U�;J���rn3����-�i�oFK�s��\��p.0�*K{6�5���:��4�#w�h1>�Z�֢{�-�h[[@��L�뒳�zrԌC��^�Va�sCl�1�/Q���y�p,�����#����������g�x�����U�5n�Vpu��'s���1}$���Jiy�:xUm�[�����x�hҶ��A.�'F4�!�M���g�>>������"EG���X&k����ze�t�̆�@��T3D�R������\��צs�RukZ�c�! 0000014208 00000 n The female lays her tiny eggs on mosses and lichens on understory vegetation and tree limbs (Powell and Opler 2009). Read the label before applying any pesticide. Pesticide treatments may be warranted to protect high value residential or recreational properties especially near bodies of water and when stands are on shallow, ledgy soils. Damage ­ When hemlock looper populations are heavy, 30­60% of the new needles and 95­100% of the old needles may be lost in any one season. The Hemlock Looper Moth has one generation a year. Mature larvae “spin down” on silken threads from feeding sites to lower branches and the ground during August and early September to pupate. TTY Users Call Maine Relay 711 Hemlock, fir, and white spruce trees can lose a significant portion of their needles in a single season when hemlock looper populations are heavy. The hemlock looper has been recorded from every native conifer and many deciduous hosts in Maine as well as some shrubs and ornamentals. By mid-August, after a pupal period of 2-3 weeks, the frail, tan moths begin to appear and flutter about. Researchers at the Laurentian Forestry Centre of the Canadian Forest Service have found a direct link between the activity of Telenomus1, parasitoids of the hemlock looper, and the collapse of an outbreak of this pest. Hemlock looper damage usually occurs in mature stands where severe Beginning June 1, susceptible softwood should be randomly checked on a weekly basis through July 1 using a 3x3 square cloth beating frame (simply tack a piece of white muslin or sheeting to some form of stable light wooden frame). 0000067041 00000 n Western Hemlock Looper Damage . Hemlock looper. The very tiny eggs are deposited singly or in small clusters on foliage, twigs, bark, understory vegetation, debris or in the litter. xref 2 . The hemlock looper is an insect native to North America, occurring from the Atlantic coast west to Alberta and Iowa. In the fall of 1996, a survey of hem-lock looper populations indicated sustain severe damage may die within a season. Hemlock looper outbreaks generally occur in mature stands. 0000004403 00000 n The western hemlock looper is a native defoliator of western hemlock, western redcedar, interior spruce and Douglas-fir. 0000004260 00000 n In situations where asthetic appearance is not so important then control measures do not need to be taken until sample numbers exceed 30-40 larve/sample. 0000027360 00000 n Coastal hemlock seems much more resilient. Caterpillars reach 1.25 inches and can be many colors, from tan to green to black. More Locations, Phone: (207) 287-3200 0000009385 00000 n 33 0 obj<> endobj This species overwinters as eggs laid on moss, lichens or bark. %%EOF Pesticide recommendations are contingent on continued EPA and Maine Board of Pesticides Control registration and are subject to change. Following the second molt (the third instar) the body darkens and begins to gain the more typical banded and spotted pattern of mature larvae. (��F�e��`�S��������+,XT�Y�c} ���q�!4���2t��7ho��cL|I� \���;;�m,��br���nY��f�{������P�9}��,��3$:u@�Q�.��Uzz�W�z����$�[� ���, The looper larvae feed briefly on new foliage and then retreat to older foliage. While holding the beating frame with one hand, gently rap the entire branch with a light stick or rod in your other hand using a downward motion toward the sheet. 0000003635 00000 n Growers of Christmas trees and wreath brush are advised to assess hemlock looper populations to determine if treatment is needed. If loopers are present they will, however, begin to rear up and wave about or move within a couple of minutes. 0000010097 00000 n Figure 2. ... Damage to the foliage of hemlock (Tsuga sp) by the elongate hemlock scale (Fiorinia externa). The preferred pesticide registered for use against the hemlock looper is Bacillus thuringiensis (B.t.). If you're unsure that the insects you observe are indeed hemlock looper, save some larvae in alcohol and send them in for positive identification. 0000021018 00000 n The tiny inconspicuous eggs of this species hatch over a period of weeks beginning in June. 0000003436 00000 n First instar larvae are tiny (1/8" or less), gray and white banded with black heads. 22 State House Station 0000001696 00000 n Hemlock looper damage usually occurs in mature stands where severe defoliation can result in growth reduction, top-kill and tree mortality. During this time they may be found crawling over tree trunks and understory vegetation, and loose webbing may be abundant. Their head changes from black to gray following the first molt (the second instar) while the body color remains similar. *NOTE: These recommendations are not a substitute for pesticide labeling. 0000297216 00000 n Carefully withdraw the frame and larvae (if present) and continue to hold flat for at least a minute. This invasive forest insect has killed hundreds of thousands of hemlocks (Tsuga canadensis) in eastern states. startxref Young larvae eat only new foliage, mature larvae eat older foliage. Hemlock, balsam fir, and white spruce are most at risk. 0000034043 00000 n Hemlock looper larvae are wasteful feeders, in that they damage but do not consume the entire n eed le. Moths are present from mid-August to October. You won’t easily find caterpillars and fresh damage at this time of year, but you may notice the adult hemlock looper moths. The Western hemlock looper moth, a native species that defoliates trees, is common in B.C. 0000108354 00000 n 33 70 H��Uˎ\E����#���]U[� ��HY V %� z���Խuo� _�f1}���ױ[�}z��,���2e��{o�T�p7����o�.7�]>R�� ��5�z�����}ڙ�>P*ٗ�5 North Shore hit with another outbreak of western hemlock looper moths The outbreak is significantly bigger than last fall, and has caused damage to … N�������3. Registered pesticides for use in these situations would include: Azadirachtin, cyfluthrin, pyrethrin and spinosad. Advice should be sought as to a course of action in forested areas. Maine Forest Service - Forest Health and Monitoring Division Hemlock looper … 0000008538 00000 n However, in wetter coastal areas, it tolerates defoliation much better. 0000002839 00000 n Table 8: Summary of balsam twig aphid (Mindarus abietinus) damage surveys conducted by Forest Health in Nova Scotia from 2003 to 2013. 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