Canadian Forest Service Publications
Binomial sequential sampling plan for hemlock woolly adelgid (Hemiptera: Adelgidae) sistens infesting individual eastern hemlock trees. 2006. Fidgen, J.G.; Legg, D.E.; Salom, S.M. Journal of Economic Entomology 90:1500-1508.
Available from: Great Lakes Forestry Centre
Catalog ID: 33098
The hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), is an exotic insect pest that is killingeastern hemlock, Tsuga canadensis (L.) Carriere, and Carolina hemlock, Tsuga caroUniana Engelnumn, in the eastern United States. We usedthe sequentialinterval procedure to develop a binomial sequential sampling plan forA. tsugae sistens on individual eastern hemlock trees that uses nondestructive sampling of new shoots.The actual a (typel) and /3 (typell) error rates were essentially 5 and 10%, respectively. Tallies of new shoots infested by at least one A.tsugae sistens were compared with stop values for thresholds of 10 and 30% of new hemlock shoots infested. Twenty to SO new shoots had to be examined per tree to render a low, high, or indeterminate classification, which took <2 min per tree regardless of the threshold used. This plan should be an efficient and costeffective tool in the management of A. tsugae infestations on individual, high-value eastern hemlock trees.