A Technique for Sampling Populations of the Jack-Pine Budworm
Abstract: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
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