102 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
In one orchard where the leaf-hopper and scab were not serious some 
measurements were obtained indicating a reduction in size of the fruit. 
The figures are presented in thef olio wing table. 
Measurements of Apple Diameters. Winesaps. 
Treatment. Number of fruit measured 
4 applications, Lime Sulphur. 412 
4 applications, Dry-mix. 801 
4 applications, Atomic Sulphur. 784 
4 applications, Dry Lime Sulphur. 619 
Check. 551 
Average diameter. 1 
2.472 inches 
2.490 “ 
2.326 “ 
2.493 “ 
2.202 “ 
x In making these measurements aphis and red-bug apples were discarded in all plats. 
Control 
There are two avenues of approach for the control of the red-spider. 
The delayed dormant and the summer applications have given satis¬ 
factory control. The delayed dormant applications have only recently 
been tried. Various miscible-oils give a high percentage kill of the eggs. 
While the following table shows that miscible oils will kill a large per¬ 
centage of the winter eggs, even better control could be expected had the 
spraying been done more thoroughly. The original experiment, how¬ 
ever, was outlined for collar-rot and fire blight and the most of the 
attention in spraying was paid to the trunk and larger branches of the 
trees. Lime sulphur did not prove satisfactory in killing the winter 
eggs. 
Value of the Delayed Dormant Application 
Egg counts. 
Treatment. Total No. No. eggs 
of eggs 
hatched 
Soluble Sulphur.. . 
. 3231 
2711 
Miscible oil 1 . 
. 3047 
388 
Lime Sulphur. . . . 
. 1405 
1079 
Miscible oil 1 . 
. 1619 
761 
Lime Sulphur. . . . 
. 4886 
3215 
Miscible oil. 
. 2871 
822 
J A proprietary mixture. 
First generation counts. 
No. Red 
% eggs No. leaves No. Red spiders 
hatched examined spiders per leaf. 
83.9 
103 
69 
.66 
12.4 
103 
142 
1.37 
76.0 
47.0 
65.8 
285 
551 
1.98 
28.6 
280 
29 
.10 
The delayed dormant spray cannot be relied upon, however, to 
control the red-spider because the small percentage of eggs that hatch 
are sufficient to reinfest the tree and produce an outbreak later in the 
summer. It is an excellent means of starting the year with trees com¬ 
paratively free from red-spider. During favorable years little or no 
injury will result but should the summer prove to be hot and dry no 
