or the small
orchard, where expensive equipment is not feasible.

The following is part of a letter from Dr. C. C. Compton, Entomologist
for the Julius Hyman and Company.

"It is our thought that since DIELDRIN is so highly toxic to
Curculionids it might be possible to take advantage of the habits of
this insect and control it by spraying the soil surface. The larval
stage of this insect leaves the nuts and enters the soil sometime in the
fall. It is believed that the larvae penetrate the soil rather deeply,
to a depth of perhaps a foot or more and remain in the soil over winter.
In the spring or early summer the larvae transform to adults and emerge
to lay their eggs. In some regions at least the adults do not emerge
until the second year after the larvae enter the ground.

It is our thought that if DIELDRIN was applied to the surface of the
soil that many of the larvae would be killed upon entering the soil or
would be killed at some later time when the adults emerge.

Dr. C. L. Fluke at the University of Wisconsin has been working for the
past several years with DIELDRIN applied as an orchard spray for the
control of plum curculio. In Dr. Fluke's work he applied the DIELDRIN to
the orchard floor or cover. He has had some very promising results. Dr.
Fluke has used two application rates, namely, six pounds and three
pounds of DIELDRIN per acre. Since he obtained a high degree of control
at the three pound level, it would seem worthwhile to investigate the
possibilities of applying even a lower rate, say one and a half pounds
per acre. In Dr. Fluke's work he applied the DIELDRIN to the soil in the
orchard using a DIELDRIN emulsifiable concentrate containing one and a
half pounds per gallon.

DIELDRIN is now available impregnated on a 30-60 mesh attapulgus clay.
Such formulations are now available containing 5%, 10%, and 15%
DIELDRIN. The DIELDRIN granules would appear to have certain advantages
over liquid sprays where the grove has considerable ground cover. A high
percentage of the insecticide is retained by the cover and does not
reach the soil. The 30-60 mesh granules have the advantage of
penetrating even the densest cover and their application results in a
maximum deposit of the insecticide on the soil surface.

Groves or orchards under cultivation can be sprayed or treated with the
granules. In either case it is advisable to disc the insecticide into
the soil following application.

The granules are free