256 EXPERIMENT STATION RECORD. 



wish to observe modern methods in tliis work. A statement is given of the 

 plan under which this worlc will ho carried ont. Notes are also given on nursery 

 inspection and on connnercial and homemade insecticides. 



S'praying' experiments for 1907, I.. F. Henderson (Idaho Sta. Bui. 61, pp. 

 3-Jo). — The author liiids that scalecide at the strength of 1:15 kills San Jos4 

 scale as well as any si)ray, hut that it is not effective when used 1:20. Salt 

 added to lime-sulphur sprays was found to be of no value, and large amounts of 

 suliihur added do not api)ear to increase the effectiveness of the spray. A late 

 fall and an early spring application for the scale is recommended. Spraying at 

 the time of flowering with Bordeaux mixture injures the fruit, causing a russet 

 appearance at the time of picking. A dust spray gave as good results for 

 codling moth as liquid spray, and the weaker sprays of arsenate of lead gave as 

 good results as the stronger. The author considers salt essential to the effi- 

 ciency of the Niagara, Rex, and IMper s])rays for peach leaf-curl. 



Spraying- in an off year, F. E. Denny (Bui. Nebr. State Hort. Soc, No. 16, 

 pp. 7). — As some doubt is often entertained regarding the profitableness of 

 sprajdng, especially in the seasons when insect pests and fungus diseases are 

 not particularly in evidence, the economic aspect of spraying was carefully 

 studied by the author, especially during 1906-7. The combination of Paris 

 green or lead arsenate and Bordeaux mixture was used in protecting apple, 

 trees against codling moth and apple scab. It was found that the average 

 gain ])er tree due to spraying was $2.13, or about $S5 per acre. 



Lime-sulphur for use ag-ainst San Jose scale, J. L. Phillips (Va. Crop 

 Pest Coin. Circ. 5, n. set:, pp. 12, figs. 10). — The formula recommended for lime- 

 sulphur wash calls for 15 lbs. each of lime and sulphur per 50 gal. of water, the 

 mixture to be boiled for 40 minutes and then strained. Directions are given for 

 the preparation of cooking appliances and for the application of the wash. 



Dipping of nursery stock in the lime-sulphur wash, P. J. Parrott, H. E. 

 HoDGKiss, and AY. J. Sciioene (Xcw York State Sta. Bui. 302, pp. 115-202, pis. 

 2). — Experiments were made to determine the A'alue of lime-sulphur wash as a 

 dip in disinfecting nursery stock for such pests as the San Jose scale, woolly 

 aphis, and other destructive insects. Tests were made of the standard lime- 

 sulphur wash at temperatures of 60°, 100°, 120°, and 212° F. The stock used 

 consisted of Bartlett pears, Ben Davis and Mann apples, Satsuma plums, and 

 Fitzgerald peaches. The time period of the immersion varied from instantane- 

 ous up to 10 minutes. 



The results of these experiments indicate that dipping nursery trees in the 

 standard lime-sulphur wash for the purpose of destroying the San Jose scale 

 is a doubtful practice. Nurserymen are advised to continue the use of fumiga- 

 tion with hydrocyanic-acid gas. 



The currant bud mite and the hazel bud mite, R. S. Macdougall (Jour. Bd. 

 Agr. [London^, I4 (1908), No. 11, pp. 676-679).— Both Eriophyes ribis and E. 

 avellanw live in the buds of their host plants, causing them to swell greatly. 

 These siiecies have sometimes been confused, and the author therefore presents 

 in parallel columns their distinguishing characteristics. Most species of this 

 genus feed ujion only one species of plant or in a few instances upon more than 

 one species of the same genus. 



Mosquito blight of tea, C. M. Hutchinson (Planters' Chron., 3 (1908), No. 

 1, pp. 21, 22). — During the year 1907 the mosquito blight was unusually sever© 

 in tea plantations. It had previously been shown that kerosene emulsion is an 

 effective remedy against this insect, but that it is too expensive. Experiments 

 were therefore undertaken to devise an equally effective but cheaper remedy. 

 This purpose was achieved in a simple soap mixture containing 1 lb. of soap 



