214 1 1
BHC 2-1/2 lbs. of 10% 244 5 9
Dieldrin 1 and 1/3 pints of 18-1/2% 148 3 5
Toxaphene 1 qt. of 31% 146 22 21
Check 61 47 20
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The reduction in the check block July 14 may be due to proximity to the
sprayed block which was not true in Eldred. This check was small. Table
8 shows on July 14 an approximate reduction of Lindane 99%, BHC 98%,
Dieldrin 98%, and Toxaphene 85%.

From these tests in both places it appears that we have a choice of
three very good materials, Lindane, Benzene hexachloride called BHC and
Dieldrin, and for that reason we can ignore the less efficient material,
toxaphene.

At Eldred, since first brood sprays were applied in a sizeable area
records of infestation were made shortly before time to spray for the
second brood to determine whether the first brood spraying would
eliminate the need for second brood spraying. However, the infestation
was found to be practically as great in this area as the unsprayed part
of the woods. It appears that the control was not good enough to allow
this. In part this was due to failure to reach the tops of the trees.
Records were made in the lower parts.

5. Varietal susceptibility.

At Anna where there was a limited number of trees, the orchards were
plotted on paper and location of each tree with variety indicated
records were made of each tree separately, in hopes that some varietal
susceptibility would be shown. There is nothing very clear in this
respect except that of the varieties in the Casper orchard, Butterick,
Busseron, Indiana, Posey, Stewart, Osburn, Major, Green River, the
Indiana and Posey may be a little more heavily infested than the others.
At Eldred for the second brood infestation, the variety of each of the
10 record trees was reported, but there were so many varieties and they
did not occur often enough in the five plots to make variety infestation
data reliable. However, the rather high average on the Indiana variety
did seem to corroborate the findings at Anna.

There was some foliage burn in two of the record trees in the Dieldrin
plot at Eldred, both being the variety Rockville. Another tree in
another part of the plot was also found to be burned and also found to
be the same variety, so it appears that this