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A Technique for Sampling Populations of the Jack-Pine Budworm

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Jack-pine budworm larvae and pupae are more prevalent on the distal portions of branches and may be significantly but unpredictably concentrated into one crown level of the tree. A suitable sampling method for population dynamics work consists of counting the budworms and tips on the distal 36 inches of 2 branches from the middle crown and 2 branches from the lower crown from groups of 10 trees. The population intensity (budworms per 100 tips) is estimated for each crown level using regression equations. The weighted average of the two crown levels gives the population intensity for each tree. From this figure the numbers of budworms per tree and per acre are calculated.

Document Type: Journal Article

Affiliations: Insect Ecologist, North Central Forest Expt. Station, U. S. Forest Service

Publication date: 1968-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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