The Yakima herald. [volume] (North Yakima, W.T. [Wash.]) 1889-1914, 1892-04-28
TIE LATEST hop REPORTS
4 New York EntOmOIOglSt Tells How 10
Control The Hop Vine AphlS.
The Hop LOuse Has Appeared In
Force ON the West SIde-Eng.
Iish Statistics for the
Years IsDO.0I.

paper, In which all hop growers should
take an interest at this time Of year.
The contribution is one Of great value,
Professor Lintner says: The one greal
uncertainty In the successful cultivation
Of the hop crop is Its liability to attack
and destruction by the hop vine aphis-
sometimes known as the hy' or the
green hy.' Although this insect IL moi
entirely absent from orr hop yards, yet
Its multiplication and the excessive In
Jury that Il frequently infiicts is depend
ent upon atmospheric and meteorological
conditions. Unfortunately these cannoi
be predicted, and therefore the hoT
grower usually defers action that would
serve to prevent aphis multiplication un'
til the attack has been made In force
cannot be wholly arrested, and can onl!
be mitigated at great expense.
''The hop vine aphis is an European
pest, which was fret observed in 1862 H.
the United States. For a long time il
has been allowed to work its ravages H.
this country In years Of its abundance
WithoutOefFOrt made against II. Quit
different has been the course pursued Il
England, where no hop grower presume
TO grow 4 crop without his regular 'hOl
washings.'
Five years ago the life history Of thu
insect was for the first time worked out
in the hop yards Of New York, by tn
chronological division at Washington
With this knowledge at our command, ]
Is safe TO say that with proper care, an
without great expense, our hop crops cat
be saved from aphis destruction.
1.-THE insect, deserving the hop yards Il
the autumn, passes 10 plum trees, on thu
smaller twigs Of which It's eggs are lai
and survive the winter. Matching In tn
early spring, three broods are develope'
on the plum, the third brood bein
winged. This brood at once takes wing
deserts the plum trees and flies to III
hop yards. This flight takes place in tn
month Of May-in ENGLAND il has bee,
noticed on the 18th Of May. The precis'
time would Of course vary with the sea-
oil, but could be ascertained by caref'
examination Of the leaves daily at abou
the usual time for It's appearance.
THE winged aphides would at 6rst b.
found on the upper leaves Of the QUITE
row Of plants in the yard. This IL tn
time, without any delay, to comment
operations against them. They shout
be killed, and thereby prevent the enorn
Gus progeny to which they would giv'
rise in the nine rapidly succeeding geneI
atoms on the hop plants. This multiph
cation, In favorable seasons, Is simpl.'
APPALLING almost incredible; but 1t nee
not be permitted.
at may be prevented by killing IL
plum tree migrating brood while upo
the outer rows Of tue yards.
Gas the plum tree brood does not In
migrate en- masse at the same time, se'
ond spraying should follow, the first in t
few days thereafter. Watch should b
kept for the advent Of newcomers, eithr
through flight or by production, as tn
new broods occur at intervals Of fe'
days, and are therefore frequent durim
the season. The spraying should be n
peated as often as necessary to proven
the multiplication which would other
wise destroy the crops. There are at lear
three methods by which much may b,
done to prevent attack:
l-Cut down and burn all the viii
plum trees in localities where hops ar
grown, 90 as TO afford fewer places wher'
the hop aphis may depositi in the autumn
Include in this such cultivated plum
trees as are not yielding paying CROP
particularly II infested with the blacI
knot.
2-Spray all cultivated plum trees will
proper emulsion during the winter, or il
the early spring before the leaves are ont
10 order to destroy the eggs Of the ho.
aphis which may have been depOsite,
there the preceding autumn. The ehlul
sion will penetrate and quickly kill 81
the eREs which Il reaches.
S-Collect and burn all theFefuse leave,
and vines Of the hop yard O. soon % tn
crop IL picked. At this time many Of III,
male aphides, which are the last to leav,
the yard, are still upon the vines, and Il
the burning It 10 believed that their mum
Der may be Tedured to the extent tha
enough will not remain to feFtiIize al q
the females that have already taken thei
departure. The mating occurs largely
II not wholly, upon the plum tree.
"The shove directions involve watch
iulness and labor, but the demand theS
make is trifing In comparison with the
vSihe Of the crop that may thereby b.
rescued from destruction"
A New York dispatch Of April 2lsi
says: Never before has there been such
stir IN hops during April, and holden
are ilfmer than ever. Choice Parincs an
quoted at 81 cents, and even that figure
does not seem to have attractions ioI
holders."
The Puyallup cOulmeree sdys7thht The
hop yards IN western Washington are be-
ing put In iirst-class condition, and every
thing looks favorable Tor an, immense
crop-except the attack Of lice.