354 THE CANADIAN ENTOMOLOGIST 



Some Notes on the Natural Control of the Cherry-tree Ugly 

 Nest Tortricid, Archips cerasivorana Fitch. By A. B. Baird. 

 (No. 8, pp. 766-771). 



The action of the various parasites and other controlling 

 factors is considered for each of the principal periods in the life- 

 history, and their effectiveness is calculated on a percentage basis. 



Other publications by the staff of the Entomological Branch 

 are the following: 



The White-marked Tussock Moth and its Control on Shade 

 Trees and Orchard Trees. By J. M. Swaine and G. E. Sanders. 

 Circular No. 11, March 7, 1918, 12 pp., 2 plates. This paper is 

 divided into two parts. The first, entitled "The White-Marked 

 Tussock Moth {Hemerocampa leuco stigma S. & A.)" (pp. 1-11), 

 by Mr. Swaine, gives descriptions of the various stages, the life- 

 history, habits, kinds of trees attacked and the natural and arti- 

 ficial means of control. The second part, "The White-marked 

 Tussock Moth as an Orchard Pest," (pp. 11, 12), by Mr. Sanders, 

 describes the injuries done to fruit, and the spraying methods 

 recommended for its control in orchards. 



The Pear Thrips {Tceniothrips inconsequens Uzel) and its Con- 

 trol in British Columbia. By A. E. Cameron and R. C. Treherne 

 Bull. No. 15, Entomological Branch, Dept. of Agriculture. May 

 8, 1918, 51 pp., 22 figs. 



In this bulletin are set forth the results of a most careful and 

 detailed investigation, extending over two years, of an insect, which 

 has for many years been causing very serious injury to orchards 

 on Vancouver Island, though known only since 1915 as the cause 

 of this damage. 



The chief injury consists in a "blighting" of the blossom 

 buds in early spring, due to the entrance of the hibernated adults 

 which feed upon the young delicate tissues within, and also to 

 the later attacks of the larvae, which hatch from eggs deposited 

 in the petioles and midribs of the leaves, and the calyces and stems 

 of the young fruit. The larvee attack not only the blossoms and 

 leaves but also the young fruit, causing a "russetting" of the skin 

 known as "thrips scab." When mature the larvae fall to the ground 

 and, penetrating the soil, pass through the remaining stages, the 



