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Binomial sequential sampling plan for hemlock woolly adelgid (Hemiptera: Adelgidae) sistens infesting individual

Jeffrey G Fidgen1, David E Legg, Scott M Salom

  • 1Department of Entomology, Virginia Tech, Blacksburg, VA 24061, USA. jfidgen@idl.idaho.gov

Journal of Economic Entomology
|August 30, 2006
PubMed
Summary
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A new sampling plan helps manage hemlock woolly adelgid (Adelges tsugae) infestations. This efficient method quickly assesses damage on eastern hemlock trees, aiding in pest management strategies.

Area of Science:

  • Entomology
  • Forestry
  • Ecology

Background:

  • The hemlock woolly adelgid (Adelges tsugae) is an invasive insect devastating eastern hemlock (Tsuga canadensis) and Carolina hemlock (Tsuga caroliniana) populations in the eastern U.S.
  • Accurate and efficient monitoring is crucial for managing this significant forest pest.

Purpose of the Study:

  • To develop a binomial sequential sampling plan for Adelges tsugae sistens.
  • To create a cost-effective and efficient tool for assessing hemlock woolly adelgid infestations on individual eastern hemlock trees.

Main Methods:

  • Utilized the sequential interval procedure for developing the sampling plan.
  • Employed nondestructive sampling of new shoots on eastern hemlock trees.
  • Established binomial classification based on infestation thresholds of 10% and 30% of new shoots.

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Main Results:

  • The developed plan achieved actual type I (alpha) and type II (beta) error rates of approximately 5% and 10%, respectively.
  • Classifying infestation levels (low, high, or indeterminate) required examining 20–80 new shoots per tree.
  • The sampling process was rapid, taking less than 2 minutes per tree.

Conclusions:

  • The binomial sequential sampling plan provides an efficient and cost-effective method for managing hemlock woolly adelgid infestations.
  • This tool can aid land managers in making timely decisions for protecting high-value eastern hemlock trees.
  • The plan's speed and accuracy support proactive pest management in eastern forests.