April, ’20] 
ISELY AND ACKERMAN: OZARK CODLING MOTH 
165 
Remedial Measures 
Experimental spraying for the control of the codling moth was 
carried on for the seasons of 1918 and 1919, the time of applications 
being based on the life history studies. A few of the plats covering the 
work for each season are given in Table I, which shows the percentage 
of fruit free from codling moth for each plat. All plats shown in this 
table, except the checks, received six sprays with arsenate of lead 
beginning with the calyx application followed by two others for the 
first brood and three others for the second and following broods. Plats 
1 during both years were the demonstration plats on which spray rods, 
with nozzles having very fine openings in the discs, were used through- , 
out the season after the calyx application, which gave a complete 
covering of the fruit until near the close of the season. Plats 14 and 13 
were the unsprayed plats for 1918 and 1919 respectively. In 1918 on 
plat 9 and in 1919 on plat 7 a spray-gun was used from the ground, 
and in 1919 a spray-gun was used from the tower on plat 6. 
Table I. Comparison of Sprayed and Unsprayed Plats for 1918 and 1919, Bentonville, Ark. 
Plat 
Total fruit 
Total wormy 
Per cent free 
from worms 
1918 
1 
5,241 
757 
85.55 
9 
4,184 
1,950 
53.39 
14 (Check) 
3,380 
2,456 
27.33 
1919 
1 
8,934 
64 
99.28 
6 
6,573 
1,455 
77.86 
7 
11,944 
1,513 
87.33 
13 (Check) 
12,568 
5,975 
52.45 
A comparison of the check plats for each season shows that the cod¬ 
ling moth infestation was much more serious during 1918. The last 
spray application during that season was made on August 5 and appar¬ 
ently it was effective until the last week in August by which date very 
few worms had infested the fruit. The hot weather referred to above 
which continued until late in the season produced, however, an unprece¬ 
dented crop of late worms many of which were able to enter the fruit. 
An additional spray, applied two to three weeks after August 5, doubt¬ 
less would have protected the fruit against this late infestation of 
worms. Fully two-thirds of the wormy apples on plat 1 can be attrib¬ 
uted to these late worms. The percentage of wormy fruit on all plats 
that received less than six applications during 1918 was considerably 
higher than on plat 1. 
By following practically the same methods in 1919 the same number 
of applications produced almost perfect results, 99.28 per cent of the 
fruit being free from worms in comparison with 85.55 per cent for the 
