250 EXPERIMENT STATION RECORD. 



;i ivsult of tlio sprM.viii.L". m net iiicrc.-iso of $32.1)5 per aero was seetu'el. The 

 season was coiuimnitivt'ly dry aiul not favorable to tb<,> develo{)iuent of the 

 disease, but from tbe good results obtained, it seeuis probable tbat when the 

 bladv rot is prevalent to a moderate degree, sp.raying will eomitletely control it. 



A demonstration experiment for tbe control of black ro^ was carried on in 

 another region in I'.IOT, in which 4 treatments of Bordeiiux mixture and 1 of 

 aunnoniacal copper carbonate were applied to the grapevines. From the treated 

 rows 1,.S22 lbs. of grapes were gathered, 97 per cent of which were of commer- 

 cial grade, while from the unsprayed rows 606 lbs. of grapes were secured, 93 

 per cent of which were marketable. 



On account of the belief that bagging grapes secures considerable protection 

 from rot, a limited experiment was carried on in 2 different vineyards, with 

 results which were decidedly unfavorable to the practice of bagging. 



In conclusion, the antliors recommend the collection and destruction of all the 

 old mummified grapes, thorough cultivation, the growth of cover crops sown 

 early in July, and spraying with Bordeaux mixture at such intervals as the 

 weather requires. 



A disease of chestnut trees, H. Sangieb {Bui. Soc. Xat. Agr. France, 68 

 (1908), No. 2, pp. 92, 93). — A brief note is given on a disease of chestnut trees 

 in Portugal that is said to be due to a lack of nitrification in the soil. When 

 this is corrected by drainage and the addition of lime about the trees, the vigor 

 of the trees is restored and the diseased condition disappears. The drainage and 

 application of lime about the trees should be done during their resting period. 



The possibility of the control of walnut blig-ht by the use of immune vari- 

 eties, H. J. IlAMSEY {Pacific Rural Press, 7J (I'JOS), Ao.s-. J.'/, pp. 212, 213; 15, 

 pp. 228, 229 ) . — Attention is called to the fact that among the walnut orchards of 

 California there are frequently to be found individuals that are moi*e or less 

 resistant to the walnut blight. Some of these have vex*y superior qualities, and 

 the author recommends that they be rapidly propagated by grafting upon resist- 

 ant stock. A method of grafting that has proveil very successful is described. 



Diseases of ornamental trees, H. Metcalf ( U. 8. Dept. Agr. Yearbook 1907, 

 pp. .'i83-'i9.'i. pis. 3, fig. 1). — A popular account is given of some of the more com- 

 mon diseases to which shade and ornamental trees are subject, with suggestions 

 as to possible moans for combating or controlling them. The diseases are grouped 

 into 2 categories, those due to unfavorable surroundings, such as starvation, lack 

 of aeration, gas poisoning, drying and freezing, smoke, dust, etc., and those due 

 to parasitic fungi. As most of the fungi gain entrance through wounds, atten- 

 tion should be paid to these and cut or injured surfaces protected as much as 

 possible. 



Eose mildew, E. Prillieux {Bui. Soc. Nat. Agr. France, 68 {1908), No. 2, 

 p. 9'i). — The author calls attention to the rose mildew {Sphcerotheca pannosa), 

 which is said to be particularly troublesome to the Bengal and hybrid roses. 

 For combating this disease it is recommended that the shoots sliowiug the 

 perithecia of the fungus should be cut off during winter and burned and the 

 remaining portions of the plant sprayed with lysol or concentrated solutions of 

 iron sulphate or copper sulphate. 



Pung'icides, insecticides, and spraying directions, G. E. Stone and H. T. 

 Fernald {Massachusetts Sta. Bid. 123, pp. 3-32). — Formulas are given for the 

 preparation of fungicides and insecticides, with directions for their use in the 

 prevention and control of fungus and insect pests. The authors give specific 

 directions for the treatment of greenhouse, field, and garden plants for the control 

 of their principal enemies. A brief note is given in conclusion on the treatment 

 of weeds on lawns, tennis courts, walks, etc. 



