the point where later hatch did not build up
to a sufficient point that good results could be observed so no spraying
was done at Anna till the second brood. At Eldred two materials only
were available, Lindane and Dieldrin.

At Eldred we had two difficulties in spraying. One was the type of
machine with which I was not familiar and the other the inaccessibility
of some of the trees. The machine is probably more fitted for field crop
work than for large trees. It is called a Mechanical Aresol Generator,
manufactured by the Hessian Microsol Corporation of Darien, Conn. The
engine is a Wisconsin Air cooled motor made in Milwaukee, Wisconsin. The
machine was mounted on a platform and transported in the orchard on a
truck. Two fifty gallon barrels constitute the tank. Due to the nature
of the machine and to lack of agitation only liquid materials can be
used in it. It uses a much smaller amount of material than I had been
accustomed to, and my first job was to learn to what extent the
materials must be concentrated to compensate for the small output and
how to get a comparison with the amounts used in regular orchard
sprayer. In concentrate tests on fruit trees we arrive at this by
judging the number of gallons which a tree would normally receive with a
standard sprayer. There was little background to go on with nut trees
and the problem was further complicated by the arrangement of trees
which were not planted but grafted in their original positions in the
woods. A clump of trees which could not be approached individually might
have to receive not much more material than one tree which could be hit
from both sides. Sizes of trees also varied. It was decided to use only
25 gallon lots of material and even this small amount sprayed from 55
to 65 trees of varying sizes. It was soon seen that the tops of the
moderate and large sized trees were not covered very well. For the first
brood sprays at Eldred about six times as much material per 100 gallons
was used as had been successful at Anna the previous season. The results
are shown in Table 6.

Table 6. Spittle Bug Control, Eldred, 1952 First brood, sprayed May 23,
examined June 9

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Treatment Amount in Spittle masses
100 gallons 800 terminals
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Dieldrin 1 gal. of 18-1/2% 18
Lindan