286 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
The object of the present paper is to briefly record some of the 
outstanding results of the tests referred to above. As our earlier 
observations indicated, the San Jose scale situation became acute in 
Indiana more than a year ago. The majority of apple orchards, at 
least in the southern half of the state, are infested. Many trees have 
been seriously injured and even entire orchards have been wiped out. 
Even the peach, which has heretofore been little troubled with the scale, 
I 
has become badly infested in some instances. The work in Indiana 
was taken over by B. A. Porter, when he came to Indiana, in the spring 
of 1923, and he has had the opportunity to carry on extensive tests of 
fundamental importance. None of Porter’s results are here recorded. 
The three years of tests are summarized in Table 1. An explanation 
of points which could not be included in the tables follows: 
All localities where tests were made are in the southern half of Indiana, 
most of them in the southwestern part of the state. All tests were on 
apple. 
The applications in the spring of 1921 were made March 22 and 23 
at Washington and March 24 and 25 at Staunton. At that time the 
leaf buds were opening and the leaves partly unfolded. As might be 
expected from applications at this late date, the miscible oil slightly 
injured foliage, but no permanent injury resulted. Counts of dead and 
live scale were made April 23-24, not less than 250 scales from representa¬ 
tive twigs being counted in each case. The twig counts and leaf in¬ 
festation made in June and September respectively gave results com¬ 
parable with the counts of dead and live scale. This was true of the 
later experiments and no further reference is made of the twig and leaf 
counts in the tables. Counts of live and dead scale were made from 
the Staunton plots April 2G. Methods used are given in more detail 
in our paper on “Estimating the Abundance and Damage by the 
vSan Jose Scale,” to be published in the Journal of Economic Ento¬ 
mology. 
In the 1921-22 experiments conducted at Bicknell and Washington, 
tests comparing the different types of dormant sprays were continued 
and were extended to include comparisons with fall and spring applica¬ 
tions. The tests were made on heavily infested trees. At Bicknell, 
the fall applications were made Dec. 8, 1921, and the spring treatments 
March 16, 1922, while at Washington the fall tests were made Dec. 
10-15, and the spring ones March 13-15. Counts of 500 scales were 
made the last of April. An additional 500 were counted in the Wash¬ 
ington tests May 27-28 and the reults were practically the same as 
