nsible for much of the loss of
crop under these heavy infestations.

It was planned to follow this up with later examination of nuts, and
this was done with the assistance of Mr. J. C. McDaniel, but
unfortunately it was found that this was the off year and the crop was
very small, so we could not definitely settle that point. This will be a
job for the future.

2. Hibernation studies.

In August of 1951, I introduced adult bugs into a cage placed over a
branch of an unsprayed pecan tree for the purpose of determining whether
there was possibly a third brood. Finding none the branch was removed
and examined to study the hibernating eggs and the egg slits in which
they were layed. The slits were not over a quarter inch long and
frequently in pairs. Eggs were deep enough that they were rarely seen
without opening the slits. Many slits were found containing egg shells,
presumably from the previous brood, but possibly from a season earlier
as the slits are corked over.

Following this study branches were cut from the sprayed and unsprayed
blocks and gone over very carefully to find the numbers and location of
the egg splits and the numbers containing live eggs and egg shells. Each
split would contain as many as 5 or 6 eggs. Table 2 show their numbers
and locations, and Table 3 the effect of sprays on numbers of live eggs.

Table 2. Pecan Spittle Bug Location of egg slits in branches

=================================================================
Diameter of branches, inches
1/8 to 1/4 3/4 3/8 1/2 1/2 to 1 inch
-----------------------------------------------------------------
Live eggs 2 9 3 1 0
Egg shells 5 42 94 23 0
-----------------------------------------------------------------

Table 3. Pecan Spittle Bug Effect of 1951 sprays on number of eggs
Examinations made March 4, 1952

=======================================================
Inches wood Number of Slits with
Treatment examined live eggs egg shells
-------------------------------------------------------
Check 508 10 63
TEPP 795 5 25
Lindane 478 0 13
-------------------------------------------------------

3. Life history and correlation of stages of insect and n