1919] ECONOMIC ZOOLOGY — ENTOMOLOGY. 755 



occurrence of and control measures for u number of the more important in- 

 sects of the year, including the wheat-joint worm, strawberry-root louse, cab- 

 bage-root maggot, bagworm, cotton boll weevil, Hessian lly, horn fly, ox warble, 

 etc. A dormant and summer spray schedule for apple trees is appended. 



Insect enemies of the allotment holder, F. V. Theobald (Wye, England: 

 Author, 1918, pp. 59, figs. 27). — A brief popular account. 



Insect problems of western shade trees, F. B. Herbert (Jour. Econ. Ent., 12 

 (1919), No. 4< PP- S33-,j37). — This is a brief summary of a survey made by the 

 Bureau of Entomology of the U. S. Department of Agriculture in the fall of 

 1916. 



Notes on Thysanoptera from Bi-itish Columbia, R. C. Treherne (Canad. 

 Ent., 51 (1919), No. 8-9, pp. 181-190, pi. 1, figs. S).— The author presents notes on 

 10 species of thrips found to occur in British Columbia, including one new to 

 science, namely, ^olothrips auriceHtus taken from western wild rye grass 

 ( Elyvius condensatus ) . 



Some work of the insectary division in connection with the attempted 

 introduction of natural enemies of the beet leaf-hopper, E. J. Vosler (Mo. 

 Bui. Cal. Com. Hort., 8 (1919), No. 5, pp. 231-239, figs. 9).— This is a brief re- 

 port by the late author on his trips to Australia in the attempt to secure enemies 

 of the beet leaf hopper. 



The saltbush (Atriplex muelleri) was found badly infested with a leaf hop- 

 per in the vicinity of Sunshine, near Melbourne, which was parasitized to the 

 extent of 90 per cent by two egg parasites, Ptergogramma acuminata and a 

 mymarid. Upon introduction into this country both failed to attack the beet 

 leaf hopper, and as they were given a fair trial it is concluded that they found 

 Eutettix tenella to be an unsuitable host. 



Notes on the behavior of the beet leaf -hopper (Eutettix tenella), H. H. P. 

 Se\'Erin (Jour. Econ. Ent., 12 (1919), No. 4, pp. 305-308).— These notes relate 

 to sexual behavior, nocturnal habit, reaction to heat, phototaxis, and reaction 

 to shadow. 



Investigations of the beet leaf -hopper (Eutettix tenella) in California, H. H. 

 P. Severin iJour. Econ. Ent., 12 (1919), No. 4, pp. 312-326, pi. i),-— The data 

 here presented have been substantially noted from another source (E. S. R., 41, 

 p. 456). 



An infestation of apple sucker (Psylla mali) in Nova Scotia, W. H. Brit- 

 tain (Agr. Ga:^. Canada, 6 (1919), No. 9, pp. 823-827, figs. 5).— The author 

 records the discovery of the introduction and establishment of this European 

 species near Wolfville, N. S., and givas an account of the nature and extent of 

 its injury. This is said to be the first record of its occurrence in North 

 America. 



Preliminary tests as a guide for future work in the control of the pest 

 were made after its discovery. Nicotin sulphate, 1 pint to 100 gal. of water, 

 was applied on June 12 by means of a Friend spray gun, and in spite of the 

 unfavorable conditions, the leaves having attained practically their full size, 

 almost perfect results were secured. Several contact dusts were also tested 

 for comparison with the liquid spray, the applications being made by means 

 of the .Johnson orchard duster. Nicotin sulphate was the basis of three of these 

 dusts, it being mixed, dried, and ground with kaolin, yellow clay, and sulphur, 

 respectively, at the rate of 2 lbs. to the hundred. Free nicotin solution 

 combined with sulphur, using the same percentage of nicotin, was also tested, 

 as was a mixture composed of .50 per cent of finely ground tobacco dust 

 ground together with 2.5 per cent of dry lime-sulphur and 25 per cent of 

 hydrated lime. 



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