8 BULLETIN 959, U. S. DEPARTMENT OF AGRICULTURE. 
In the Johnson orchard the principal part of the experimental 
work was a test of the efficiency of coarse sprays applied with a short 
rod and Bordeaux nozzle in comparison with mist sprays applied by 
means of spray poles equipped with whirlpool- disk nozzles. 
The short rod referred to consisted of a piece of iron pipe about 
1 foot in length, to one end of which was attached a Bordeaux nozzle 
and to the other a cut-off to which the hose was connected. Under 
a pressure of 225 to 250 pounds and with the nozzle sufficiently open, 
the spray was practically a solid stream as it left the nozzle, but 
broke up more or less as it reached the tree. This type of spraying 
apparatus had been used by many Grand Valley growers for several 
seasons in preference to the spray poles, formerly employed, because 
it rendered spraying less burdensome and increased the speed of the 
work. The spray gun, which was subsequently developed, is an 
improvement over the short rod, in that the character of the spray 
can be readily graduated from fine to coarse. 
The spray history of the experiments in the Johnson orchard will 
be found in Tables 5 and 6. 
TaBLE 5.—Spraying schedule for the codling moth, Johnson orchard, Grand Vailey of 
Colorado, 1916. 
Calyx ! Cover sprays—second 
spray. Cover sprays—first brood. andithirdiprasde: 
A. B. G: Ds 182 Jae G. 
Number of plat. 
Petalsog, | weeks, | “Gays | Wdeys) |) days 1) 2 ee eee 
May 2-3. | after A after B, after B, | after C, | otter A Briere F 
ay i M D June 12. June 16. June 26. p | 
ay 29. July 8. | Aug. 11-18. 
5 Geta fel UHR A a irsteeeeee coconut 4 Dota bet | Fourth ING Se Sixth 
10 REE ees Map (CKO sa bat Sell ase ORE EE: OL PEN A pa ee ace OMes Ole as (0) 
u SRS UL Mirae RL do BA es do. AIST Neate Tm LCURAT ad 2) AMA eye NT ei | renee ee 
AVS es oes US ee ee || Sh Once ee OE EOC H A) Tepe eee OR UN Re Ra aie BOM ae 
UES ASS » Unreal ESCO ee ent aa (GVO PRAM Aaa PLR hy [pis Si. Aes al a Third ens Fourth 
IVT Des ERS i eh GON BP yf GOES Nase | Rt ee ae ee PRE ty eis) RSI UR SE Maa lowe ess 0. 
AVALB aes oe SIR Reise ae CO) EYE) ER HN le a te Seat ts | eh i 1 Ses Loa Se A ee (i a ae 
TaBLE 6.—Treatment of plats for the codling moth, Johnson orchard, Grand Valley of 
Colorado, 1916. 
Spraying equipment. 
Num- 
ber of Spraying materials. 
plat Calyx spray. Cover sprays. 
Df Ses Arsenate of lead, powder, | Spray poles and Bordeaux | Spray poles and whirlpool-disk 
1 pound—50. nozzles. nozzles. 
JO Dphes 2s COS e Ian elon ab VaR Short rod andBordeaux nozzle | Short rod and Bordeaux nozzle. 
JB ead Ce Koy Sat a a aN SN 2 aI ad Spray poles and Bordeaux | Spray poles and whirlpool-disk 
nozzles. nozzles. 
LO Wet telat eae Bey GOgns see Pe IOAN Yaa SD aM Short rod and Bordeaux nozzle | Short rod and Bordeaux nozzle. 
Vee ccc ene GOS SRA Deen Seen Ene Spray poles and Bordeaux | Spray poles and whirpool-disk 
nozzles. nozzles. 
WALES 5 es (Oe EDA UE GM TE PRES tats ea Short rod and Bordeaux nozzle | Short rod and Bordeaux nozzle. 
WirEe ss). Check—unsprayed..-.........-. | AS SRY ke NE | oh es 
