THE DEVELOPMENT OF SAMPLING TECHNIQUES FOR FOREST INSECT DEFOLIATORS, WITH PARTICULAR REFERENCE TO THE SPRUCE BUDWORM

摘要: The problems that arise in the development of sampling techniques are treated sequence, solutions illustrated being based on population studies spruce budworm northwestern New Brunswick. Insect populations may be expressed different ways, depending upon objects sampling, and it is essential these carefully defined. In preparation life tables primary objective, terms a basic unit (branch surface) an absolute (the acre). correct timing requires knowledge insect's history, stability place time. When insect signs (pupal cases, empty egg masses) sampled, retention factor gives rise to certain non-sampling errors. mechanics collecting foliage from tall trees solved with aid aluminum pole pruners, extension ladders, tree trestles, platforms. counting insects by ocular e...