PDF-Rev. The hemlock woolly adelgid is a very destructive pest of eastern

Figure 1 Insecticide applied as a soil drench Figure 2 Insecticide can be injected into the soil around hemlock trees Rev 0610 Foliar Treatments This refers to treatments that kill adelg. Repeated attacks weaken trees cause twig gouting kill branches and over the course of several years cause trees to die What is at risk There are nearly 19 billion balsam fir trees in Mi chigans forests And as the third largest Christmas treegrowing invasiveplantsabca Habitat Woolly burdock grows in most soil types but pre fers moist loamy well drained soils in full sun Identi64257cation Stems Stems can grow to 250 cm and are branched Stems are erect and grooved with white cobwebby hairs Stems a Ex situ . Gene Conservation of Eastern Hemlocks (. Tsuga. . canadensis. ) . Threatened . by the Hemlock Woolly . Adelgid. (. Adelges. . tsugae. ). Robert . M. Jetton. 1. , . Kevin M. Potter. 2. , William . Tennessee Division of Forestry. Background History of HWA. Hemlock woolly adelgid (HWA) (. Adelges tsugae) . is a non-native insect pest that kills native eastern and carolina hemlocks. . (. Tsuga canadensis . of this forest resource in the East. The potential ecological impacts of this exotic pest are hemlock in the East. It can be found from New Hampshire to nwest to central Pennsylvania (Figure 1). The Distinctive featuresHemipteranWhite wooly massesAdults dark purple to blackAbout 1 mm FlightlessFirst instars and crawlers amberOnly females in North AmericaASEXUAL REPRODUCTION! http://bugguide.net/n Jazz . Slappey. Ms.Carter. 5. th. Grade. December 1, 2015. What are Constructive Forces?. Constructive Forces are processes that help build or construct the Earth.. Constructive forces can deposit soil or silt in a river.. Constructive Forces. A constructive force is on that build up the Earth’s surface.. B. Examples: . Mountain building . Deposition of sediment. Volcanic Eruption. August 2006 brought two new things to the . Constructive. vs. . Destructive. Processes. Constructive vs. Destructive. Constructive forces affect the earth's surface by building it up while forming new crust and landforms like mountains, islands, deltas, and sand dunes.. Constructive Process. Things that happen to the Earth that build it up or make positive changes.. Destructive Process. Things that happen to the Earth that destroy or break down part of it. . Erosion. Background History of HWA. Hemlock woolly . adelgid. (HWA) . (. Adelges. . tsugae. ) . is a non-native insect pest that kills native eastern hemlock . (. Tsuga. . canadensis. ). . HWA was first discovered in Virginia in 1951 and as of 2012 has spread to 18 eastern states where it has significantly altered or reduced native hemlock populations . Adults and nymphs are 1/16. th. of an inch long and very hard to find. It produces a white wool-like covering to protect itself and its eggs. Hemlock Woolly . Adelgid. Life Cycle. Eggs are protected by woolly sacs that are produced by adult . Modeling the impacts of hemlock woolly adelgid infestation and presalvage harvesting on carbon stocks in northern hemlock . forests. Jeffrey Krebs, Jen Pontius and Paul . Schaberg. Mapping relative risk of HWA impacts on hemlock growth across the northeast. 1mm small wingless insect. Has 2 – 4 generations per year. Injects toxic saliva that damages tree’s vascular tissues, eventually killing the tree. Transported in crawler stage by wind, animals, and people.