2 BULLETIN B8, T :. 5. DEPARTMENT OF AGRICULTUEE. 



The present article deals with results obtained in spraying in 1913. 

 Work was carried out in two orchards, namely, that of Messrs. 

 Sherman & Johnson and that of Mr. Robert Beers. Unfortunately 

 the report of results in the latter orchard is not entirely complete, so 

 that the details of these experiments can not be given. In general, 

 however, the results obtained hi the Beers orchard agree with those 

 secured in the Sherman & Johnson orchard, and the latter are given 

 in detail in the following pages. 



EXPERIMENTS IN THE SHERMAN & JOHNSON ORCHARD. 



A portion of the Sherman & Johnson orchard, about 5 acres in 

 extent, was selected for spraying experiments and was subdivided 

 into plats, as shown in figure 1. 



The trees were large, and codling-moth conditions were fairly 

 typical for the valley. Plat I received three applications: Plat II, 

 four applications: and Plat III, five applications of arsenate of lead 

 spray. Plat IV was left unsprayed throughout the season for pur- 

 poses of comparison. A good power sprayer was used, capable of 

 supplying three or four leads of hose, and maintaining a pressure of 

 200 to 225 pounds. (See fig. 2, showing outfit in operation, and size 

 of trees used.) Further information concerning the treatments and 

 the dates of spray applications for the respective plats is given in 

 Table I. 



Table I. — Treatments and dates of applications of sprays for codling moth, Sherman & 

 Johnson orchard. Roswell, X. Mex., 1913. 



Dates of appli- 

 cations. 



Plat I d applications). 



Apr. 24-25 



(After falling of 

 petals. ) 



Mav 7-S. 



Arsenate of lead, G 

 pounds to 200 gal- 

 lons of water. Bor- 

 deaux nozzles. 164 

 gallons per tree! 

 225 pounds pres- 

 sure. 

 Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water, ver- 

 morel type nozzles. 

 13 j gallons per tree. 

 200 pounds pres- 

 sure. 



June 16-17 Arsenate of lead, 8 



pounds to 200 gal- 

 lons of water. \ er- 

 morel type nozzles, 

 lof gallons per tree. 



July 14-15. 



Aug. 2. 



Plat II (4 applica- 

 tions). 



Plat III (5 applica- 

 tions). 



Arsenate of lead. 6 

 pounds to 200 gal- 

 lons of water. Bor- 

 deaux nozzles. 164 

 gallons per tree. 

 225 pounds pres- 

 sure. 



Arsenate of lead, S 

 pounds to 200 gal- 

 lons of water. Ver- 

 morel type nozzles. 

 13J gallons per tree. 

 200 pounds pres- 

 sure. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water. Yer- 

 morel type nozzles. 

 15 \ gallons per tree. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water, ver- 

 morel type nozzles. 

 \~\ gallons per tiee. 



Arsenate of lead, 6 

 pounds to 200 gal- 

 lons of water. Bor- 

 deaux nozzles. 16J 

 gallons per tree. 

 225 pounds pres- 

 sure. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water. Ver- 

 morel type nozzles. 

 13 J gallons per tree. 

 200 pounds pres- 

 sure. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water. Ver- 

 morel type nozzles. 

 15J gallons per tree. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water. Ver- 

 morel type nozzles. 

 17J gallons per tree. 



Arsenate of lead, 8 

 pounds to 200 gal- 

 lons of water. \er- 

 morel type nozzles. 

 9J gallons per tree. 



Plat IV 

 (unsprayed). 



Unsprayed. 



Do. 



Do. 



Do. 



