2 BULLETIN 88, U. S. DEPARTMENT OF AGRICULTURE. 
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 in 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. 
Taste [.—Treatments and dates of applications of sprays for codling moth, Sherman & 
Johnson orchard, Roswell, N. Mex., 1913. 
| l 
Dates ofappli- | p). R jo eerste Plat IJ (4 applica- Plat II (5 applica- | Plat TV 
cations. Haid (© applications). tions). tions). _(unsprayed). 
Apr. 24-25........| Arsenate of lead, 6} Arsenate of lead, 6 | Arsenate of lead, 6 | Unsprayed. 
(After falling of pounds to 200 gal- pounds to 200 gal- pounds to 200 gal- 
petals. ) lons of water. Bor- lons of water. Bor- lons of water. Bor- 
| deaux nozzles. 163 deaux nozzles. 164 deaux nozzles. 164 
| gallons per tree. gallons per tree. gallons per tree. 
225 pounds pres- 225 pounds pres- 225 pounds pres- 
sure. sure. sure. 
May 7-8..........| Arsenate of lead, 8 / Arsenate of lead, 8 | Arsenate of lead, 8 Do. 
pounds to 200 gal-| pounds to 200 gal- pounds to 200 gal- 
lons of water. Ver- lons of water. Ver- lons of water. Ver- 
morel type nozzles. morel type nozzles. morel type nozzles. 
132 gallons per tree. | 13% gallons per tree. 133 gailons per tree. 
| 200 pounds pres- 200 pounds pres- 200 pounds pres- 
| ~ sure. sure. sure. 
JunesAG6—A72 = =.= | Arsenate of lead, & | Arsenate of lead, 8 | Arsenate of lead, 8 Do. 
pounds to 200 gal- pounds to 200 gal- pounds to 200 gal- 
lons of water. Ver- lons of water. Ver- lons of water. Ver- 
morel type nozzles. morel type nozzles. morel type nozzles. 
153 gallons per tree. 152 gallons per tree. 153 gallons per tree. 
AREA a ied ie ere ee oe She ee ee Arsenate of lead, 8 | Arsenate of lead, 8 Do. 
pounds to 200 gal- pounds to 200 gal- 
lons of water. Ver- lons of water. Ver- 
morel type nozzles. morel type nozzles. 
171 gallons per tree. 174 gallons per tree. 
PARI DP eee oes Arsenate of lead, 8 Do. 
| lons of water. Ver- 
| morel type nozzles. 
ERR nes 2S _ 2 oes Ley SER | gee = cee eae 
| pounds to 200 gal- 
| 
| 
93 gallons per tree. 
