The Kennewick courier-reporter. [volume] (Kennewick, Wash.) 1939-1949, 1946-02-28

oil spray. This should not be
put on beyond the delayed dor
mant condition.
In very mild cases, q light fall
application of four to five pounds
zinc sulphate alone may be APP
piled to early maturing varieties
such as Jonathans. This method
is not safe for later maturing
varieties such as NewtoWn and
Rome.
Zinc oxide, one-half to one h.,
or basic zinc sulphate OelmO-Z),
one to two pounds, can be used
in calyx and first cover on pears.
It is not good on apples, however,
because it frequently causes rus
setting.
Don't use zinc sulphate with
dormant oil, dormant lime sui
plate, or lime sulphur oil mix
ture.
Airplane busting m at e ri !
should reach the tips in liquid
form. When it reaches the tips
in crystalline form, absorption Is
greatly hindered. One hundred
pounds per acre Of material used
in airplane application seems to
be adequate.
SQUASH BUG
And we have rather good news
from Walter J. Clare, HORTICULTURE
list of the experiment station at
Prosser. Mr.. Clare is hopeful that
Yakima and Kennewick valleys
may again grow the marblehead
squash. We quote from a recent
release from Mr. Clare about con-
troll methods used on the squash
! bug.
The once popular marblehaed
squash may again be grown In
the Yakima valley as a result Of
new methods for squash bug con-
troll. The depredations Of this
insect to which marblehead
squash is particularly susceptible,
has virtually eliminated this crop
from the irrigated section Of cen
trail Washington since 1899. Prior
to that time the marblehead( de-
veloped for resistance to the curly
top virus disease, was the leading
variety of squash in commercial
production in this area.
In search for better insecticides
to use against the squash bug, Il.
ID. Eichmann, assistant entomolo-
gist, of the Washington Agricul-
tural Experiment Station last
year found that DOT and saba
dilla dust were both outstanding
in effectiveness over other mater
ials tried. One Of the chief adj
vantages of these two dusts e
that they remain effective against
the squash bug for several days
after application which IS not
true for most other contact In
secticides.
Everyone is familiar with the
wonder insecticide, dichlorodiph-
NEUTRALITY-SUSPICIOUS., more COM
monty called DOT. Sabadilla Is
an alkalioid found in q Mexican
lily plant. It has been known
for some time, but has not been
popularized as has dot.
Mr.. Eichmann's earlier work
encouraged further testing Of
these insecticides during the 1915
growing season at the irrigation
branch experiment station, near
Prosser. The following results
were obtained from tests conduct
ed ON one-third acre of Marble
head squash.
Little difference was obtained
in squash bug control between
the use of 20 per cent sabadlla,
and 3 and 10 per cent DOT dusts.
The first four DOT applications
were 3 per cent in strength; the
fifth was 10 per cent. Both in
secticides controlled the squash
bug effectively over an extended
period Of time when applied at
the rate of so pounds per acre.
The first dustings were made 43
days from seeding and thereafter
at weekly intervals until four ap-
plications had been made. At the
first dust application squash bugs
were present and some plants
had already been killed by the
h,,oc nh,rin0 the foalr week