31 pages matching tree crowns in this book
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_ ﬁ Analysis of Variance balsam fir Bi-m black spruce cent Cephus cinctus Chief Bay correlation crown levels decline decrease in larval defoliation estimate defoliation history dense populations density index Dept Developmental Index difference egg mass density epicenter factors five trees Forest Insect heavy flower hibernacula Hurkett indices infestation Insect Densities Insect Invest instar Lake Nipigon Larval and Pupal larval density measure Muskrat Lake needle drop needle length Number of Larvae number of needles number of samples number of shoots old foliage parasites period population density population level pupae pupal quadrants required number required sample sample trees season severe defoliation shoot length shoots and larvae Sibley Sibley Peninsula significant spruce budworm population stages staminate flowers Table tree crowns trend twigs Unhatched upper level white spruce