or 6-1/2 to 8 gallons of liquid lime-sulfur in water to make 100 gallons
of spray just as the buds are opening. Related species of similar habits
that attack walnuts have been controlled with 9 or 10 gallons of liquid
lime-sulfur in water to make 100 gallons of spray applied at the time
the buds break or soon thereafter.

The feeding of the spider mites on the foliage of infested trees causes
it first to have a bronzed or scorched appearance, and later to dry up
and fall. These mites frequently become abundant following the use of
some of the new organic insecticides, such as DDT and BHC, which destroy
their natural enemies and perhaps have other effects on the trees
favorable to mite activity. The European red mite, which overwinters
on the trees in the egg stage, can be controlled by application of
3-percent oil-emulsion spray in the late-dormant period. The two-spotted
spider mite and related species, as well as the European red mite if it
is not controlled with the dormant spray, can be controlled with a spray
containing 1 pound of a 15-percent parathion or 1-1/2 pounds of a
15-percent Aramite wettable powder per 100 gallons. Apply the spray
before many leaves show the typical bronzing or leaf scorching. If the
infestation is heavy, a second application may be necessary in about 8
or 10 days. Be sure to follow the precautions on the container,
especially if you use parathion.

PRESIDENT MacDANIELS: We greatly appreciate your care in getting this
thing together, and we know it is going to be a great help to us when we
get it printed as a matter of reference.

MR. O'ROURKE: I'd like to ask Dr. Baker if insects are getting stronger
or if the chemicals are getting weaker. I refer to the rates of
application. Formerly we were told that one-half pound of parathion for
one hundred gallons and one pound of DDT would control almost all
insects. I note the rates are going up.

MR. BAKER: That's true, particularly with parathion. The first year that
we tested parathion on any scale we thought a quarter to a half a pound
would control mites for 30 days or more and would control curculio for
20 or 30 days, but the next year we used it we found that was a little
optimistic. It seems that each year since we have had to use more of it
or use it more often, or with mites, particularly, there are a number of
instances where it just doesn't control them at all.

Two years ago that came to notice in the Wenatchee area of Washington