26 BULLETIN 959, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLE 18.—Treatment of plats for the codling moth, Red Cross orchard, Grand Valley of 
Colorado, 1918. 
Spraying equipment. 
ae Spray materials and supplemental control measures. 
Calyx spray. Cover sprays. 
1 ES eee Arsenate of lead, powder, 1 pound—s0, and codling- | Spray poles and | Spray poles and 
moth traps. Bordeaux noz- whirlpool disk 
zles. nozzles. 
ER re | Arsenate of lead, powder, 1 pound—50.................|..-.. do2es ae Ae N Do. 
eee | Arsenate oflead, 1 pound—8d0. fish-oil soap, 2 pounds— |..... GOs ee Do. 
50, and codling-moth traps. : 
TV......| Arsenate of lead, 1 pound—50, end fish-oil soap, 2 |..... CO Le Gees Do. 
pounds—50. 
Vis Se Arsenate of lead, powder, 1 pound—s0, and codling- |..... (8 (a) as i | Do. 
moth traps. 
Vie Arsenate of lead, powder, 1 pound—s0............-....|....- GOS Ese ee oe ee Do. 
VII1.-....| Arsenate oflead, 1 pound—s0, fish-oil soap, 2 pounds— |...-. doe ees Do. 
50, and codling-moth traps. | 
VIII....| Arsenate of lead, 1 pound—50, and fish-oil soap, 2 |...-. doi S27 Lass i Do. 
pounds—S0. | 
TX. ....}; Arsenate of lead, 4 pound—S0, and fish-oil soap, 2 |..-.. do: tae ae Do. 
ounds—S0. 
XG he: Arsenate/ot lead.-4 pound—50. (224. Sve. ivi hee COP ee Do 
xe Checks pra yeds= oso eee Soe ee ase pe Sean er a ne 
XII sO Onde. Pe case Bes EE Ss AU TR A ar LA A Rte re meee 
. TaBLE 19.—Spraying schedule for the codling moth, Red Cross orchard, Grand Valley of 
Colorado, 1918. 
Cover sprays—second 
| 
5 
spray. Cover sprays—first brood. | and third broods. 
| 
| | | 
A. | Be | C. D. E. F. | G. 
No. of plat. | | | 
3t04 | 9days 8 to9 
Petals off, | weeks aiter | after B, | ies = es weeks after 2 eas 
May 10-14.) A,June | June | June 15-17. | June 23-24.| A, JUV | aug 10-15 
3-5. 12-13. | nde: Sees g : 
Pea a hee a ae oe ES Gaca Se Second....} Third..... | Pe ee ae Fourth ifthe. = Sixth 
I Wp a EE O o Sed One ese Sec cene eens end Owe AGO Es Do 
ey oe es do G02 226 ees G (ye es a eee Stee doz. 1d0>- Do 
MV ee Bee rine ete doe aes ees GOSS sees sd Onan oa eee ee ere (6 a ee do Do 
NEL eae et Oe eee do SAQOk 3 Sh aes ae PIG oo oA ae eee ees Fourth Fifth 
AWA Eee be Be eee do GO aap Wave ee Dees EGOS er oas cae se meee Ofsss3 0 
AVAL Seen Soe ee SS ee do 200 (Neate es Ae ececet at COs seer een me do Do 
AVR Tee pee es ae oe do eee (Vays eae eee yaa mets (0 ie ial UO See, SENS do Do 
ee ee Pee eee do.. [AsO Os 2oo asus eseaeale. SOs. ts ae ee a ee Oa as ee DO 
DAT RS pane eal (EN GO ee a ee eee Res (opt re ae be 8 Mies et do Do 
SGT es ee i) Gheek <ul whee Ree Al eS oat a Se ees I scaeete ah: Saab a meena ee 
45 Ce Sere ee a a Ope ope etc ones ek Jl mae ements Were ssees Pees eer 
The results of these experiments are summarized in Table XX. 
The best results were obtained in plat IV in which 77.36 per cent of 
the fruit was free from worms and 60.36 per cent was free from both 
worms and stings. This plat was sprayed six times with arsenate 
of lead and fish-oil soap. Plat III, which had a hke number of 
applications of the same materials and in addition was provided 
with the codling-moth trap, yielded 71.80 per cent of fruit free from 
worms and only 42.78 per cent free from both worms and stings. 
None of the other plats produced satisfactory commercial returns, 
and in plat VIII, which was sprayed five times with arsenate of 
lead and fish-oil soap, but 21.23 per cent of fruit was free from 
