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<br /> <br /> <br /> <br /> <br /> <br />Emerald Ash Borer Management Plan <br />City of St. Anthony Village, MN <br />WSB Project No. 022315-000 Page 4 <br />3.0 Emerald Ash Borer Biology <br />Ash trees are killed when EAB larvae (the immature stage) feeds under the bark of <br />ash trees, disrupting the tree’s ability to transport water and nutrients throughout the <br />tree. The feeding creates the iconic S-shaped galleries underneath the bark. The <br />adults feed on ash leaves but are not the primary driver of tree mortality. Due to its <br />small size, and its inconspicuous location under the bark, it can be difficult to detect <br />in the early stages and typically infests a tree for three to five years before visible <br />signs and symptoms appear. During that time, one generation of beetles can emerge <br />from an infested tree each year and fly to nearby ash trees. <br />The emerald ash borer adult is very small from 3/8-1/2 inches long, and the <br />immature stage (larvae) is about one inch long. <br />Emerald ash borer spreads about one to two miles per year, which is the average <br />flight distance of an adult beetle. <br />The insect has spread faster than one to two miles per year due to human movement <br />of firewood, nursery stock and other ash products. <br /> <br />Photo 2: EAB Larva <br /> <br />Photo Credit: Pennsylvania Department of Conservation <br />and Natural Resources -Forestry, Bugwood.org <br />