358 EXPERIMENT STATION EECORD. [Vol. 41 



caterpillars of Vanessa urtica;, brown-tail moth, and silkworm by inoculation. 

 The cultural characteristics of the bacillus are described. 



Reports and papers on malaria contracted in England in 1917 {Rpts. Local 

 Govt. Bd. [Gt. Brit.], Pub. Health and Med. Suhjs., n. ser., No. 119, abridged 

 ed. (1918), pp. IX+5o, i)Is. 6). — Included in this report are a pai^er by A. J. 

 Grove on English Mosquitoes (pp. 44-50), tables showing recorded observations 

 of anophelines in England (pp. 51-53), and General Abstract from a Report 

 to the Army Medical Department on the Mosquito Survey of the Aldershot 

 District, by A. C. Parsons (pp. 54, .55). 



The cabbage fly (Chortophila brassicae) {Meded. Phytopath. Dienst Wagen- 

 ingen, No. 8 {1919), pp. 18, pis. 3). — A report of studies of C. brassicw, the in- 

 jury which it causes, and control measures employed. 



Eumerus strigatus again, C. L. Metcalf {Ent. News, 30 {1919), No. 6, pp. 

 170-174)' — The author presents records of the occurrence of the lunate onion 

 fly which supplement the paper by Weiss and Nicolay previously noted (B. S. R., 

 40, p. 6.54). 



Protection from the locust borer, F. C, Craighead {U. S. Dept. Agr. Bui. 787 

 (1919), pp. 12, pis. 3). — The author reports at length upon investigations which 

 have shown it to be practically certain that plantations of the black or yellow 

 locust {Robinia pseudacacia) can be protected successfully from the locust borer 

 (Cyllene robinioe) and grown profitably on a commercial scale if the locusts are 

 planted in thick stands or mixed with other trees so as to produce a densely 

 shaded condition and natural pruning during the first 10 or 15 years of growth. 

 It is said to be very essential that the shade be present after the trees reach 1.5 

 to 2 in. in diameter, and that it be continued until they attain 5 or 6 in., after 

 which thinning and pruning can be done with little or no subsequent injury by 

 the borers. 



" That difference in site or locality is not the influencing factor in the growing 

 of uninjured trees is evident from the fact that in every locality examined it was 

 possible to find examples of borer-free and destroyed trees growing 100 yds. 

 apart. It is also evident that goldenrod is not necessarily associated with greater 

 damage by the borer, for in the same abandoned field, massed with this plant, 

 were found plats of trees absolutely free from injury and near-by isolated trees 

 badly infested. Again, localities where no goldenrod is growing may have borer- 

 infested trees, the adults feeding on other composites." 



Among the other recommendations are that locust plantations be gone over 

 and the broken-down and infested trees removed and burned during the winter. 

 If the cutting out of the infested trees can be done early in November, it is not 

 necessary to destroy or burn the wood. 



It has been found that the young borers can be killed readily by the use of 

 an arsenical spray, consisting of 0.25 lb. of sodium arsenite or arsenate in 5 gal. 

 of water to which 1 qt. of miscible oil is added and agitated thoroughly, applied 

 to the bark when the new growth begins to open at the tips of the twigs in the 

 spring. Kerosene emulsion may be used in place of the miscible oil to carry the 

 arsenical, 1 gal. of the stock solution being added to 0.25 lb. of the ansenical in 4 

 gal. of water. 



The confused flour beetle (Tribolium confusum), R. N. Chapman (Rpt. 

 State Ent. Minn., 17 (1918), pp. 73-94, f'ffs. 10).— This is a report of work at the 

 Minnesota lOxperiment Station with the confused flour beetle, which has six 

 larval instars. The relative infestation of wheat flour and wheat flour substi- 

 tutes and their relative susceptibility are considered at length, together with 

 measures of control, a discussion of which by the author has been previously 

 noted (E. S. R., 40, p. 59). 



