126 



buds. First and second ins tar nymphs were also rapidly destroyed 

 by lime-sulphur 1 : 8 and 1 : 9 with or without starch. All the sprays 

 used injured the buds and foliage to a slight but not an appreciable 

 extent. In order to destroy nymphs that had escaped the first spray 

 a second application was made after the blossoms fell ; f pint to 40 

 gals, of Blackleaf 40 was added to the usual spray for codling moth 

 [Cydia pomonella] and the results were excellent. 



Marlatt (C. L). The Federal Plant Quarantine Act. — 50th Ann. 

 Rcpt. Ent. Soc. Onfayio, 1919, Toronto, 1920, pp. 38-43. [Received 

 8lh January 1921.] 



The inauguration and working in the United States of the Federal 

 Plant Quarantine Act is discussed, and the most importani quarantines 

 of the present day are reviewed. A brief account is given of the 

 nursery stock, seecl and plant quarantines. 



LocHHEAD (W.). Hopkins' Bioclimatic Law. — 50th Ann. Rept. Ent. 

 Soc. Ontario, 1919, Toronto, 1920, pp. 43-19, 3 figs. [Received 

 8th January 1921.] 



The author discusses Hopkins' bioclimatic law [R.A.E., A, viii, 

 87, 278] which he describes as one of the most far-reaching contri- 

 butions to economic entomology. He believes that it would be 

 practicable and most advantageous to obtain similar data for Canada 

 to that compiled for the United States, relying upon the Canadian 

 experiment stations and the reports prepared by the Federal and 

 Provincial agencies for the data relating to phenological problems. 

 The hope is expressed that some competent Government official 

 may vmdertake this work, with a view to the extension of the practical 

 application of the law to the different sections of Canada. 



Criddle (N.). Locusts in Manitoba, with special Reference to the 

 Outbreak of 1919.— o^/// Ann. Rcpt. Ent. Soc. Ontario, 1919, 

 Toronto, 1920, pp. 49-53. [Received 8th January 1921.] 



A review of previous locust invasions in Manitoba indicates that 

 these are likely to occur at intervals of about 15 years, and that the 

 infestation will probably last two or more years. The literature of 

 the 19th century records by far the most important injur}^ by Melano- 

 plits sprctiis (migratory locust), M. atlantis and Cammila pellucida 

 being present in lesser numbers. The last outbreak of any importance 

 bsgan in 1900, and was largely quelled in the second year by the use 

 of poison baits ; after about 14 years, during which the Province has 

 been practically free from locusts, some half a milhon acres in southern 

 Manitoba were threatened by a serious invasion in 1919. By the 

 time reports of damage were circulated, the young hoppers were 

 beyond immediate control, and whole fields were swept bare, while 

 materials for bait were lacking. The manner in which the infestation 

 was gradually subdued by the use of poison bait, and later by a hopper- 

 dozer, is described. In this outbreak, for the first time on record, 

 the chief species was Camniila pellucida. This differs from Melanophis 

 in selecting for oviposition roadsides and grassy areas, depositing its 

 eggs in clumps of grass, while Melanoplits oviposits in bare ground 

 among sparse vegetation or in stubble fields. It also flies lower than 



