Open AccessEGG SAMPLING FOR THE WESTERN HEMLOCK LOOPER
Author(s) -
M. G. Thomson
Publication year - 1958
Publication title -
the forestry chronicle
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 49
eISSN - 1499-9315
pISSN - 0015-7546
DOI - 10.5558/tfc34248-3
Subject(s) - bark (sound) , crown (dentistry) , biology , moss , western hemlock , forestry , horticulture , botany , geography , ecology , medicine , dentistry
The western hemlock looper will lay eggs in all parts of a tree, but in the years prior to heavy defoliation the greatest number of eggs will be found on the bole in the mid crown. Moss and lichen are the preferred oviposition sites, but many eggs are laid singly in bark crevices. Where ten or more eggs per half-square-foot sample of bark are found in the mid crown, noticeable defoliation may occur in the next summer.
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