CONTROL OF CODLING MOTH IN COLORADO, 5 
tions as plats I, II, VI, and IX, but in plat VII homemade arsenate 
of lime paste * was substituted for arsenate of lead paste, and in 
plat VIII commercial arsenate of lime powder was used. Plat X 
was unsprayed for comparison with the treated plats. 
TaBLE 2.—Spraying schedule for the codling moth, Johnson orchard, Grand Valley of 
Colorado, 1915. 
Calyx spray. Cover sprays—first brood. Cover SPrAys Sean and third 
) 
Number of A. B. Ce D. IDE 100 G. 
plat —— | 
3 to4 21 to 22 z 10 to 11 21 to 24 
Petals off, weeks days acegee weeks days oo a8 S 
May 5-7. after A, after B, TF og after A, after E, Nate on 
May 24-26. | June 14-15. > | July 16-17.| Aug. 6-9. Bee: 
1 epee pee Ay Cae IES Gages Second EER Yu Gli ate 2 Ns Sree ape Fourth IMO Aas 
If os 32 ee a ea Oy Sc ete Ore! RSAC OM Maan | Ptier cee ren OM ee Oars 
TOUTE ee aig ts Bes Se aed) ae Ay RdOes sees Lek Bee Vent Oe et BOUTG hsb pe ee S Doxey nee 
ENV ea a SN ok a 8 CR ie dogs RIG OM AEE se SEC ORNS EAT: ae Hourthes sae itt hee. Sixth. 
Ni i a SO rt OE doses One ae HSL ONOVES Seeds el ees ee ar IO OIE ears Wye a ates vol! 
Vali tp ees ete AEA Eee GOte Pkt A dOweeE ee LUMYG Ko) a ated | Bra ae RA SEO ee Hh hee 
WAG Ce SOO tyne eral Pee Gost see S(O KO} NE, Sues FAG COVE eas P| Lan alate aes Obed sey 8 Cerise 
WAT DES S32 2.8 Ris ty ae Goes PROVO) Sk Sa BE RGIO A He alee seal do Gone | 
ENCE eae ye ee te et LO Niger feck SACOM ee ae oh 20 OTe Ar | (eens ea ClO) ees alten dose 
DiG4 Ss Oa TAS OER! CON YELENA Ss ae TEA Ue We Ae dP eh eB OA 
TaBLE 3.—Treatment of plats for the codling moth, Johnson orchard, Grand Valley of 
Colorado, 1915. 
Spraying equipment. 
Number ; a 
of plat Spray materials. Pressure. 
Calyx spray. Cover sprays. 
Pounds. 
eee Arsenate oflead, paste, 2pounds—50...} 200-225 | Bordeaux nozzles.| Whirlpool-disk nozzles. 
Ife Sa Ue ae hae CGV ee See ee oe ea Ta 200-225 |e =. domae seen Do. 
NOG eee ee (ORO) i Pate ate dE NS tan a hs etek 200-225 |....- CO lOVese Mies stn se Do. 
SVR Soe We ote ee ase BEE APL ROR Re ome aE ae 200-225 |... .- Gosh Vo yen Do. 
WA esta Re aa CUO oe NOS ee AVN ee he Pe a oe pun 200-225 |....- Goer ee Do. 
NVI Seat oil Ua eas Coppa O r3 ey be Par es te GE Sore tat 90 | Vermorel nozzles. .| Vermorel nozzles. 
VAL Te Be Arsenate of lime, homemade, 21] 200-225 | Bordeaux nozzles .| Whirlpool-disk nozzles. 
pounds—350. ? 
VATS: 2:9 Arsenate of lime, commercial powder, 00-225 |....- £0 Was ops aN, RNC Do. 
# pound—s0. 
1D: Gas Arsenate of lead, paste, 2 pounds—50..| 200-225 |..._. dora sear ene Do. 
2652 eee IRC heck——Un SPrayed ce cna te Ree e nee Seales Moca he Cuba le 
The results of these experiments will be found in Table 4, by 
reference to which it will be seen that plats I, II, and IX, the treat- 
ments of which were alike, produced from 52.88 to 68.41 per cent of 
fruit free from worms. Under the varying conditions that exist in 
most orchards, such as unevenness of insect infestation, likelihood of 
moth migration, differences among the trees in the crop yield, and 
other contributing factors, uniform results can not always be obtained. 
Because of these conditions in commercial orchards one section fre- 
quently is wormier than another, although the treatment is uniform 
° For method of preparation see U. S. Dept. Agr. Bul. 278, Miscellaneous Insecticide Investigations, by 
E. W. Scott and E. H. Siegler. 
