CONTROL OF CODLING MOTH IN COLORADO. 1033 
All the plats, except the unsprayed checks and plat X, were given | 
the calyx treatment. The total number of applications varied from 
five to seven, with six in the majority.’ Plats I, IH, III, and IV 
were given the same number of applications, three cover sprays for 
the first brood and two for the second and third broods. Plats V 
and VIII had but four cover sprays of lead arsenate, two for the first 
brood and two for the later broods, and in addition plat V was pro- 
vided with the codling-moth trap appled to each tree. Plats VI 
and VII were sprayed throughout the season at the same time as 
plats I to IV, but, as described later, received different treatment. 
Plat IX received the largest number of applications, three cover 
sprays for the first brood and the same number for the second and 
third broods, making a total of six cover treatments. Plat X was 
given five cover sprays, but, as previously mentioned, the calyx 
treatment was omitted. Plats XI, XII, and XIII were given treat- 
ment at the same time as the other plats having five cover applica- 
tions, but the dusting method was substituted for the liquid. 
Arsenate of lead, powder, at the rate of 1 pound to 50 gallons of 
water was used in all of the sprayed plats, except plat VII, in which 
arsenate of lime, powder, three-fourths pound to 50 gallons, was 
employed, and plat III, where 40 per cent nicotine sulphate, diluted 
1 part in 800 parts of water, was used. Forty per cent nicotine 
sulphate at this strength was also used with arsenate of lead in plat 
IV, and in plat VI fish-oil soap, 2 pounds to 50 gallons, was used as a 
spreader and sticker. Codling-moth traps, described on pages 35-38, 
were used in plats I and V. Plats XI, XII, and XIII were dusted 
with arsenate of lead mixed with hydrated lime as a filler in the pro- 
portions shown in Table 9. In plat XI a dust mixture containing 
20 per cent of arsenate of lead and 80 per cent of hydrated lime was 
used; in plat XII, the arsenate of lead was decreased to 15-per cent 
and the hydrated lime increased to 85 per cent. Plat XIII was 
treated with 10 per cent of arsenate of lead and 90 per cent of hydrated 
lime. Plats XIV and XV were sprayed by the owner with arsenate 
. of lead and, as previously stated, plats XVI and XVII were untreated 
throughout the season. 
The summary of results of these experiments is presented in 
Table 10. 
