摘要:

Methods are described for the biological detection of coramine and for the production of coramine crystals with mercuric chloride. By the use of the crystal method as small an amount as 0.004 mg. of coramine has been detected.

ISSN:1923-4287    

DOI:10.1139/cjr41d-029

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

The progress of intracocoon development in relation to temperature and moisture is described for a one-generation and a two-generation area in eastern Canada. In the one-generation area (central Gaspé) the degree of seasonal emergence from the overwintered cocoons can be forecast with considerable accuracy by means of sample analyses during the period of pronymphal and early pupal development. This is possible since few individuals that have not initiated development by late June do so later in the summer, even though environmental conditions are quite favourable. The technique fails in a two-generation area (south central New Brunswick) because members of the overwintered population may continue to respond to favourable temperature and moisture conditions throughout the entire season.On the basis of biologic and climatic data the area occupied by the European spruce sawfly in eastern North America is divided into zones representing the probable distribution of one-, two-, and three-generation areas; intermediate transitional zones are also indicated.

ISSN:1923-4287    

DOI:10.1139/cjr41d-030

出版商:NRC Research Press    

年代:1941

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr41d-031

出版商:NRC Research Press    

年代:1941

数据来源: NRC