110 PATHOLOGY [Bot. Absts. 



747. Brittlebank, Charles. Green manurial crops and "take all." Jour. Dept. Agric. 

 Victoria 17: 171-173. 1919.— See Bot. Absts. 3, Entry 848. 



748. Chase, W. W. Common insects and diseases of the apple. Georgia State Bd. 

 Entomol. Bull. 54. 51 p., 12 pi., 22 fig. 1919. — Contains descriptions, life histories and meth- 

 ods of controlling the more common pests of the apple, Pyrus malus. The last part devoted 

 to cultural directions. — T. H. McHatton. 



749. Col6n, E. D. La eradication de la enfermedad de las rayas amarillas de la cana, 

 [Eradication of yellow-stripe disease of cane in Puerto Rico.] Estac. Exp. Insul. Puerto Rico 

 Circ. 14. 6 p., 3 pi. 1918. — A study of literature and specimens of mottled cane of Porto Rico 

 has revealed that it is the same disease already known and studied in Java and Hawaii under 

 the name of the "yellow stripe" disease. A summary of the facts known of the disease seems 

 to indicate that it is a characteristic mosaic disease. [English translation in Agric. News 

 Barbados 18: 62-63. 1919.]— F. M. Blodgetl. 



750. Coons, G. H. The soft rot of hyacinth. Rept. Michigan Acad. Sci. 20:353-354. 

 PI. 89-40. 1918. — A rot of the hyacinth caused by Bacillus carotovorus is recorded. The 

 disease is considered identical with a rot described by Heinz in 1889 and attributed to Bacillus 

 hyacinthi septicus. — L. M. Massey. 



751 Coons, G. H. Michigan plant disease survey for 1917. Rept. Michigan Acad. Sci. 

 20:425-450. PL 41-50. 1918. — A summary of plant disease conditions in State of Michigan 

 for 1917 based upon general observations and special reports. Specimens sent in by farmers 

 and county agents furnished data for conclusions drawn. Reports were made on diseases of 

 cereals, orchard and small fruits, vegetables, and conifers. The article shows the widespread 

 distribution of these diseases and stresses the fact that they are easily communicable. It is 

 the purpose of the Plant Disease Survey to stop the great leak in agriculture which results 

 from preventable diseases, and in this capacity it deserves recognition by both state and 

 nation. — J. Norma Anderson.. 



752. de Castella F. Copper fungicides for vine diseases. Jour. Dept. Agric. Victoria 

 17: 104-112. 1919. — It is shown that copper-soda sprays are most efficient when the copper 

 is mainly in the form of basic sulphate, the advantages being greater stability, less scalding of 

 foliage, and higher fungicidal power. When pure sodium carbonate is used the copper will be 

 contained in the carbonate form. The class of mixture which causes the least damage is that 

 which contains the maximum of tetracupric sulphate. Either an acid or alkaline copper 

 soda causes foliage damage. — In the case of an alkaline spray, leaf injury is due not to excess 

 soda, but to the presence of copper carbonate. Directions for mixing: dissolve 10 pounds of 

 bluestone in 20 gallons of water and 3.5 pounds of soda ash in 30 gallons of water. Mix the 2 

 solutions and screen. — J . J . Skinner. 



753. Dtjngan, George H., and John Pieper. Control of important potato diseases and 

 insect pests. Illinois Agric. Exp. Sta. Ext. Circ. 31. 7 p. 1919. — Treatments for the control 

 of some of the potato diseases are given. — M. J. Prucha. 



754. Earle, F. S. Instrucciones para la eradication de la enfermedad del mosaico de 

 la cana. [Instructions for eradicating mosaic disease of cane. Puerto Rico Estac. Exp. 

 Insul. Circ. 14. P. 6-8. 1918. — The key to control, as the disease is not curable, consists in 

 planting only healthy cuttings, either from healthy fields or resistant varieties. Care should 

 be taken that new plantings be isolated from old. New planting should be inspected and dis- 

 eased plants removed. [English translation in Agric. News Barbados 18: 62-63. 1919.] — 

 F. M. Blodgetl. 



755. Edgerton, C. W. The mottling disease or mosaic of sugarcane. Louisiana Planter 

 and Sugar Manufacturer 62 : 397. 1919. — A disease of sugar cane which resembles the mottling 

 disease of Porto Rico and probably is identical with it is present in some parts of Louisiana. 



