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HWA & Water Quality

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Hemlock woolly adelgid (HWA) threatens our forest, but the loss of these trees would affect more than just land. Take a quick look on how hemlocks impact water quality in Ottawa County and Michigan.

Published in: Environment
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HWA & Water Quality

  1. 1. Save MI Hemlocks!
  2. 2. Hemlocks effect on thermoregulation 1.8-3.6F cooler in summer Warmer in winter
  3. 3. >68F stressful for brook trout 3% w/ hemlock vs. 18% w/o hemlock (Ross and Bennett 1996)
  4. 4. Defoliation in stream canopy Algal productivity  35%- 80% (Sheath et al. 1986 )
  5. 5. What can YOU do?
  6. 6. Step 1. Educate yourself. Step 2. Educate your friends, family & neighbors. Step 3. Check out hemlocks-even healthy looking ones! Step 4. Prevent the further spread.
  7. 7. Remember that HWA:
  8. 8. Do not move infested limbs! This is a very, very efficient way to spread HWA all over town.
  9. 9. Trim your trees! Your vehicle can become a vector when infected branches brush its roof or sides. We have a documented account of spread from Muskegon to Zeeland this way.
  10. 10. Remove bird feeders during active months Birds as known vectors. HWA is only active April- August. Birds easily spread HWA. Remove bird feeders that are near hemlock trees.
  11. 11. Step 1. Educate yourself Step 2. Educate your friends, family & neighbors. Step 3. Check out hemlocks-even healthy looking ones! Step 4. Prevent the further spread. Step 5. Report It! Step 6. Treat infested trees.
  12. 12. Photo credit: Great Smoky Mountains National Park Resource Management
  13. 13. Heed label laws! We want to help you with treatment, but if you are treating on your own, heed the label laws. The insecticide that effectively treats HWA can contaminate groundwater if not used appropriately.
  14. 14. saveMIhemlocks.org Protect our forests. Protect our water.

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