146 EXPERIMENT STATION RECORD. 



Some brief notes are given on some sugar cane diseases, and tlie report 

 concludes witli a list of Trinidad fungi. 



The control of the chestnut bark disease, H. Metcalf and J. F. Collins 

 (U. S. Dept. Agr., Farmers' Bui. 467, pp. 24, figs. 4). — This serious disease of 

 the chestnut was first described in 1906 as occurring in the vicinity of New 

 York City (E. S. R., 19, p. 250). Since that time it has spread, and is now 

 known to occur in 10 States, and in the vicinity of New York City and adjacent 

 counties it has practically destroyed all chestnut trees. 



The cause and symptoms of the disease and means of spread and control are 

 described at length, the method of control being largely based on a thorough 

 inspection of forests and the destruction of all infected trees. This method was 

 successfully put in application in the vicinity of Washington, D. C, in the fall 

 of 1908, and up to June, 1911, the disease had not reappeared in the country 

 within a radius of approximately 35 miles. 



The text of the Pennsylvania state law of 1911 dealing with the disease is 

 given in full. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



The grouse in health and in disease, being- the final report of the Com- 

 mittee of Inquiry on Grouse Disease (London, 1911, vols. 1, pp. XXIII+512, 

 pis, 59, figs. 33, charts 8; 2, pp. 150, pi. 1, maps 40)- — Volume 1 of this work is 

 divided into 3 parts, the first (pp. 1-146) dealing with the normal grouse, the 

 second (pp. 147-371) with the grouse in disease, and the third (pp. 372-502) 

 with the management and economics of grouse moors. Volume 2 contains addi- 

 tional data dealing especially with young grouse and maps showing the inci- 

 dence of grouse disease in former years. 



Twenty-sixth report of the state entomologist, 1910, E. P. Felt (N. Y. 

 State Ed. Dept. Bui. 490, 1911, pp. 180, pis. 35, figs. 10).— This report covers the 

 year ended October 15, 1910. 



The experimental work with the codling moth was continued during the year 

 under more diverse conditions. Experiments were conducted in 3 orchards, the 

 plats consisting of 42 trees and the fruits from the central 6 alone being counted. 

 Comparisons were made to ascertain tlie relative efficacy of one spray given 

 just after the blossoms dropped with this treatment supplemented by a second 

 application about 3 weeks later. The author concludes from the data secured, 

 which is here presented in detail, that it is possible with but one spraying to 

 obtain over 90 per cent of sound fruit in a year when the codling moth is very 

 abundant, even on trees yielding only from 300 to 500 apples. He is of the 

 opinion that the possibilities of one thorough timely spraying have habitually 

 been underrated. The conditions in the Hudson Valley are such as hardly to 

 justify the repeated applications so generally in vogue in the western part of 

 the State. 



The juniper webworm {Dichomeris marg melius), a European species that 

 does not appear to have been previously discovered in America, was received 

 during the year from Tarrytown. Technical descriptions are given of its stages 

 and a brief account of its life history and literature. Brief accounts and de- 

 scriptions are also given of a large aphid spruce gall (Chermes cooleyi), and 

 the ash psylla (Psyllopsis fraxinicola) , another European species first recorded 

 from this country in 1899 which appears to have about the same life cycle as 

 the pear psylla, the adults wintering on the bark of the tree and the insects 

 becoming abundant in June. 



Brief notes on some of the more injurious or interesting species which came 

 to the entomologist's attention during the year follow. Those mentioned imder 

 fruit insects are the pear slug, cigar case bearer, cherry fruit fly, lined red bug 



