Index | Map:Infected Areas | How it Kills: Stages 1-2 | How it Kills: Stages 3-5 | What's Being Done

HOW IT KILLS: STAGES 3-5
3. After as many as 18 months, the larva changes into a pupa that resembles a small adult. It stops feeding and becomes inactive while its body harden

4. Finally, the pupa becomes an adult and tunnels its way out of the wood, leaving a large exit hole. Adults usually appear in early summer

5. Adults feed on leaves and bark for a few days and then mate. Adults live for about two months

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A. Bark protects the tree from the environment
B. Phloem transports nutrients throughout the tree
C. Cambium produces each year's supply of phloem and xylem cells
D. Xylem transports and stores water from the roots
E. Heartwood gives the tree its strength. If air reaches this layer, decay quickly sets in
Sources: USDA; Animal and Plant Health Inspection Service; E. Richard Hoebeke, Cornell University; University of Vermont; Hugh Johnson's Encyclopedia of Trees; TIME Graphic by Lon Tweeten; Text by Jackson Dykman; FROM THE MAY 27, 2002 ISSUE OF TIME MAGAZINE; POSTED MONDAY, MAY 20, 2002
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