60 



recognition of the importance of economic entomology, but much 

 useful work is now being done and it is hoped that valuable additions 

 will soon be made to the existing literature on this subject. 



Chapais (J. C). A few Notes on the Pear Tree Slug.— ^'^mf^ Ann. 

 Rept. Quebec Soc. Protection Plants from Insects <& Fungous Dis., 

 1916-1917 ; Quebec, 1917, pp. 25-27. [Received 12th December 

 1917.] 



The larvae of Eriocampoides lunacina {Selandria cerasi) (pear tree 

 slug) causes much injury to pear, plum, cherry and quince trees in the 

 orchards of Quebec, and to hawthorn, mountain-ash, and sallow in the 

 woods. During 23 years' investigations only one brood has been 

 observed in Quebec, the larvae first appearing at the beginning of 

 August. To destroy them it is advisable "to dust freshly slaked lime 

 on the leaves of infested trees. Arsenical insecticides are recommended 

 on cherry trees after gathering the fruit. In the case of a bad attack, 

 where no insecticide has been used, ground fertilisers such as 125 lb. 

 nitrate of soda, 200 lb. superphosphate and 40 bushels wood ash per 

 acre are necessary to help the trees to recuperate. 



Fetch (C. E.). Carriers and Diluents for Dusting. — Ninth Ann. Rept. 

 Quebec Soc. Protection Plants from Insects & Fungous Dis. , 1916- 

 1917 ; Quebec, 1917, pp. 28-29. [Received 12th December 1917.] 



The value of dust as compared with Hquid insecticides has been 

 much discussed and tested during recent years. The dusting method 

 has been much more extensively used during the season under review 

 and has given good results, though there are still many objections to 

 this method. It is not yet known whether sucking insects such as. 

 Aphids can be destroyed by dusting, though this method is successful 

 for biting insects. One serious objection to dusting is its cost, and 

 this consideration has led the author to make a study of carriers and 

 diluents. Carriers should be nearly of the same specific gravity as the 

 insecticide used, otherwise the heavier material will sink to the bottom 

 of the container. A table is given showing the method of preparation, 

 cost and efficacy of many carriers that growers can make for themselves; 

 the best diluents and carriers as yet tried are talc schist, limestone, 

 gypsum, china clay and silt. 



Gibson (A.). Cabbage Insects. — Ninth Ann. Rept. Quebec Soc. Protec- 

 tion Plants from Insects & Fungous Dis., 1916-1917 ; Quebec, 1917, 

 pp. 30-41, 2 plates, 2 figs. [Received 12th December 1917.] 



This paper assembles a quantity of information, for the use of 

 growers of cabbages, concerning the insects that attack these crops 

 almost every year in Quebec. The species dealt with include 

 Chorfophila (Phorbia) brassicae, Bch. (cabbage root maggot) ; cutworms 

 such as Euxoa ochrogaster, Gn., (red-backed), E. messoria, Harr. (dark- 

 sided), Agrotis ypsihn, Rott. (greasy), and E. tesselhta, Harr. (striped) ; 

 flea-beetles such as Phyllotreta vittata, F. (turnip flea-beetle), and 

 Epitrix cucumeris, Harris (potato flea-beetle) : Pieris rapae, L. 



