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How to distinguish between old and new egg masses of the western spruce budworm


Author:
Twardus, Daniel B., Carolin, V. M. (Valentine M.), United States, Forest Service, Cooperative State Research Service, and Canada/United States Spruce Budworms Program
Source:
USDA
Year:
1984
Subject:
Western spruce budworm and Eggs
Format:
7 p. : col. ill. ; 22 cm.
Language:
English
Publisher:
U.S. Dept. of Agriculture, Forest Service and U.S. Dept. of Agriculture, Cooperative State Research Service
Series:
Agriculture handbook
Collection:
USDA publications
Permanent URL:
http://handle.nal.usda.gov/10113/CAT89231721