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Published byCharleen Golden Modified over 10 years ago
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Other Invasive Insects Or What Else do I Need to Worry About?
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Most insects are beneficial pollinators predators and parasites detritivores food!
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Native vs. Invasive Trees have some resistance Predators and parasites Populations often cycle Example: spruce budworm Trees often have no resistance Few or no effective natural enemies Populations keep on rising
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Reasons why you are glad you live Downeast
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Browntail Moth
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Winter Moth Pupates in soil May-Nov
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Hemlock ~1/8” discrete white woolly masses Undersides of twigs Base of needle Hemlock Woolly Adelgid Photos: USFS Photo: Maine Forest Service
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Hemlock Woolly Adelgid Forest: Alfred, Arundel, Berwick, Biddeford, Kennebunk, Old Orchard Beach and Topsham (detection survey); Scarborough (trained volunteer). Planted (EHS+HWA): Mount Desert, Sedgewick
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HWA Crawlers, Crawlers, Everywhere! April - July Abundant Very Mobile Nearly Invisible
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Hemlock Woolly Adelgid (HWA) Chemical treatment – when high risk of human spread Biocontrol – best long- term solution. In areas protected from development. Outreach and public education.
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Elongate Hemlock Scale First detected in ME in 2009 Not quarantined – depend on public reporting Attacks fir and spruce as well Chemical control on planted trees to reduce spread to native forest Maine Dept. Ag.
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Two Invasives of Concern (not found here yet)
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Brown Spruce Longhorned Beetle Photo: Georgette Smith, bugwood.org Longhorned beetle (Cerambycid)
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New Find 2011
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Maine Hosts: Spruce (fir, larch, pines) Photos: Maine Forest Service, Forest Policy and Management
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Recognizing BSLB Photos: CFIA (left), Jon Sweeney, bugwood.org (middle and right) Round to D-shaped 1/8” exit holes Resin Covered Trunks Yellowing Foliage
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Recognizing BSLB Photos: Georgette Smith, bugwood.org L-Shaped Pupal Chamber Larval Feeding Tunnels
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Recognizing (what is not) BSLB Spruce Beetle – Native pest – Pitch tubes (not always) – Round exit holes (smaller)
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Questions? Photo: Jon Sweeney, Natural Resources Canada, Bugwood.org
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Emerald Ash Borer (EAB) Pest and Diseases Image Library, Bugwood.org Bright metallic green -½ inch long
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Emerald Ash Borer - long and narrow - likely to be found near ash trees Tiger Beetle - broader - definite ‘shoulders’ - often flies near ground (very fast)
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Will our cold winters protect us from EAB?
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Maine Hosts: White, Green, Brown Ash WhiteGreenBrown WhiteGreen Brown Photos: Maine Forest Service, Forest Policy and Management
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Crown Decline (top down) Troy Kimoto, Canadian Food Inspection Agency, Bugwood.org
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Epicormic Shoots
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S-shaped Galleries
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D-shaped exit holes Photo: University of Wisconsin Entomology
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Bark Splitting Michigan Department of Agriculture, Bugwood.org
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USDA Forest Service - Region 8 Archive, USDA Forest Service, Bugwood.org Recognizing EAB David Cappaert, Michigan State University, Bugwood.org Jim Tresouthick, Village of Homewood, Bugwood.org
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Impact Hosts all – Attacks all species of North American ash all – Kills all of the trees it attacks – Has killed 10’s of millions of trees since 2002 – Has the potential to wipe out ash in NA Photo: Maine Department of Agriculture
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The Enemy Killed tens of millions of trees since 2002 Spread to 18 states and 2 provinces No effective natural enemies (yet) Little or no tree resistance Emerald Ash Borer One of the biggest problems… No good method of monitoring for EAB
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Purple Traps Trap Trees Biosurveillance So How Do We Monitor For EAB? Public Education
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Purple Sticky Traps - Least sensitive -Most user friendly -Cheapest 2012 – 965 traps 2013 – 852 traps
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Trap trees -fairly sensitive -lots of work!
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Volunteer trap-tree network 2013 – hope to involve state parks and MFS foresters
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Biosurveillance
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Cerceris fumipennis - Native wasp -Solitary ground-nester (in colonies) -Non-stinging -Provisions its nest with adult buprestids (metallic wood-boring beetles) -Is capable of finding EAB at low levels BIOSURVEILLANCE Family: Crabronidae (hunting wasps)
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Wasp colonies used for biosurveillance Colonies not used
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If we find an EAB infestation early… Smaller area infested, fewer beetles present Much lower chance of inadvertent spread Smaller quarantine We have more management options Management is much more effective
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We found EAB! Now what??? Delimiting survey (monitoring) SLAM: SLow Ash Mortality (management of EAB) Biological control Pesticide options
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3 Parasitic Wasps Spathius Tetrastichus Oobius
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SLow Ash Mortality Delimiting survey Remove large trees in infested area Girdle trees to concentrate & remove EAB Can concentrate and reduce EAB popluation
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Firewood
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