660 EXPERIMENT STATION RECORD. [Vol.41 



A study of the root-nematode (Heterodera radicicola) and its control, 

 W. P. DuBUz (Soil Sci., 4 (1917), No. 6, pp. J,Sl-Ji92, figs. iO).— Means of con- 

 trol include excess moisture, high temperatui'e, formaldehyde, sphasnum moss 

 extract, and sodium cyanid dissolved in water. All decreased nematode activity 

 and are sujigested as means of control. 



Sodium cyanid treatment is regarded as practical and satisfactory for nema- 

 tode infestation. This substance dissolved in water is applied to the soils at the 

 rate of 200 lbs. per acre (one-third gallon per sq. ft. of soil). A second treat- 

 ment should follow about a week later. After this, the soil should be aerated 

 and leached before planting. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Federal protection of migratory birds, G. A. Lawyeb (U. S. Dept. Agr. 

 Yearbook 1918, pp. S03-316, pis. 3, figs. 2). — A popular account of the protection 

 of migratory birds by the Federal Government. 



Life histories of North American diving birds. — Order Pygopodes, A. C. 

 Bent (f7. S. Nat. Mus. Bui. 107 (1919), pp. XIII +245, pis. 55).— This bulletin 

 reports investigations commenced in 1910 and carried on in cooperation with 

 other American ornithologists in continuation of the work begun by Bendire. 

 Twelve plates in colors illustrate the eggs of 37 species. A bibliography of 7 

 pages and a subject index are included. 



Report of the entomologist, R. H. Pettit (Michigan Sta. Rpt. 1918, pp. 

 278-280). — Among the more important insect enemies of the year here noted are 

 a borer in corn which appeared the previous year and has now been identified 

 as Noctua fractUinea; the flower thrips, which was identified as the insect pro- 

 ducing blemishes on Elbertas in the western part of the State (E. S. R., 40, p. 

 650) ; and Macrosiphum cynosbati, which produced witches' broom in Houghton 

 gooseberry. The fungus Isaria farinosa, introduced by the author in several 

 localities where the tamai-ack sawfly abounded, is said to be responsible for 

 killing numbers of this pest. 



Entomology (Missouri Sta. Bui. 163 (1919), pp. 4i-43).— A brief report of 

 the work of the year. The Hessian fly practically disappeared from the State, 

 having succumbed to weather conditions and not to parasites or other natural 

 agencies. 



Report of the division of entomology, F. Sherman (North Carolina Sta. 

 Rpt. 1918, pp. 42-49). — This report of the chief on the more important work of 

 the year with insect pests includes a report of the entomologist, Z. P. Metcalf 

 (pp. 4^-49). The latter report deals briefly with the work with the gloomy 

 scale, which is the most destructive insect enemy of shade maples in the State ; 

 the bean and pea weevils ; the melon beetles ; the tobacco flea-beetle ; and insects 

 affecting ornamental plants. 



Notes on some insect pests of Costa Rica, J. Zetek (Jour. Econ. Ent., 12 

 (1919), No. 3, p. 269). — The notes here presented relate to observations made 

 in Costa Rica during the latter part of February and March, 1919. 



The author found the spiny citrus white fly (Aleurocanthus woglumi) to be 

 very abundant on citrus of various species at Limon and at all the stations of 

 the Northern Railroad as far as Peralta, and the purple scale to be extremely 

 abundant on both leaves and fruit of citrus. The Hawaiian sugar cane borer 

 (Rhabdocneinis obscurus) was exceedingly abundant in banana stumps and 

 cuttings. Mention is also made of the high Infestation of balsa logs about to be 

 shipped to the United States with lepidopterous larvae and pupje. 



[Contributions on economic insects] (Ztschr. Angew. Ent., 4 (1918), No. 3, 

 pp. V +335-391). — Among the papers here presented are the following: Intro- 



