ol the grubs of
the "June bugs," or brown June beetles, or what are called "white
grubs."

MR. LOWERRE: Would the DDT kill the parasitic wasps?

DR. ADAMS: Turf treated with chlordane or DDT is grub-proofed and is not
of any use to the flying parasites as a place to lay eggs, or for
bacteria to multiply. So we don't want to put chemicals on top of
biological control plots. For instance, on an average home property I
would treat the front lawn, the more valuable piece, with chemicals so
that it would be 100% grub-proofed to protect the turf and to take that
much turf out of beetle production. Then on the back lawns or grassy
fields adjoining, I would apply at least a half-pound of this milky
disease material, and in that way provide a complete treatment; the
parasites can be added on some large public turf area nearby. And don't
think you are going to stamp the Japanese beetle out just by spraying
all the adult beetles you see each summer on the cultivated plants,
because there are lots more on the shade trees, weeds and vines.

A new book, "The Insect Enemies of Eastern Forests," contains a great
deal of information on the insects feeding on nut trees. Unfortunately,
it isn't indexed to crops, so you can't look up "walnut" and find what
insects bother you. You have to know what the insect is, and you will
find it with its insect family. That is U. S. Department of Agriculture
Miscellaneous Publication 657, by George E. Craighead. Price $2.50, from
the Superintendent of Documents, Washington, D. C.

MR. CORSAN: What in the world has become of the black walnut
caterpillar, that big, black fellow with the grey hairs?

DR. ADAMS: Maybe they are at a low point in a cycle. Mr. Bernath will
show you a few of them.

MR. CORSAN: He might show me a few of them, but I have been pestered
with them for years, and this year I haven't got any.

DR. ADAMS: I suppose natural conditions have taken care of them for a
while, but they will come back again.

(Applause.)

DR. MacDANIELS: Thank you, very much, sir. We will take a few minutes
recess now.

(Whereupon, a short recess was taken.)

Editor's Note: The following paper which was delayed, was originally
scheduled for our 1949 Report.

Insecticides for Nut Insects

E. H. SIEGLER United States Department of Agriculture Agricultural
Research Administration Bureau of Entomology and Plant Quarantine

Fortunately, the growers of nuts do not have to combat a large nu