The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1890-09-09
OREGON HOP LOUISE.
Vile Pest Has Attacked Will
lamette Valley Vines.
INSECT FULLY IDENTIFIED.
II Disitkes Sunshine and Prefers Field
Shaded by Trees-Does Not
Readily Migrate.
port,and oregonian.

Portland OregouIau.
Its fact beyond dispute the hop louise
he genuine Phoyodoa, Is present in some
,arts of Oregon. With figures OF Phoro-
kou h,,a,.K before one and strong pocket
lens. or. better still, dissecting micro
,cope. a careful observer can and will de-
tide for himself that the insect which is
now injuring the hop crop in parts OF Lane
county is not any one of the different
,phids. or green plant lice. found on apple,
oium, etc. As further proof of its pres
snce, though with the means mentioned
shove 1.-THE specialist needs no otber),
stephen Smeed. himself careful observer
md a man who has worked here and IN
England among hops for nearly sixty years,
declares it identical in appearance and work
gith the hop louise. Mr.. Hubbard, prom
,nent hop buyer and former grower OF
sons IN the East. says: mo man who has
,een the insect in the East can deny its
presence here. / recognized it at once.
The question which now arises is: How
hall we combat this pest, which seriously
threatens one of the leading industries of
lane. Marion, Polk, Linn and other coun-
lies. and the revenue from which amounts
veariy in Lane county alone TO nearly
1901 600.
In connection with this fact it is inter-
utipg to review the results of some work
lone by Professor &. v. Riley, United
states entomologist. | will briefly describe
he life history of Phoyodoa hunsuti. pub
ished by him as the result of work done a
ew years since, and then respectfully
summarize a few observed facts in Lane
,eunty which apparently, to some extent,
hough they may not wholly, contradict
lis statement.
PROFESSOR RILEY's ACCOUNT OF LIFE HISTORY.
In the late autumn the glossy small eggs
II Phoyodoa huDlt,k are found attached to
criminal twigs and round buds, in pro-
,runus. both wild and cultivated. They
emain in these branches during the win
er, and in the spring hatch, pro-
iucing what is called the ''stem
mother" This generation produces
hree generations on prunus, the
bird being winged and flying to neighbor-
ng hop plants. A number OF generations
IRE produced on the hop plant until early
autumn, when winged females are again
produced and fly back to the plum or
,ther epecies of prunus. These are soon
oIlowed by winged males, which invariably
cave the hop plant after the female, and
he fortified eggs are again deposited on
he trees of the genus prunus.
This being the case, according to his OBJ
ervations, Professor Riley recommends
he destruction, by burning or otherwise.
If all the hop plants Immediately after the
,ops are gathered. thus killing males and a
arge per cent of the females before migra-
ion to plum. (This. by the way, will be
IN excellent measure here in Oregon
wherever the insect may pass the win
Err. l.. W.
Professor Riley advises the spraying of
he dormant cultivated species of plumbs
with strong caustic washes to kill the egg,
md also counsels the killing of all wild
,ium trees in the vicinity of the hop yards.
And further to carefully guard against the
Introduction of eggs on prune or plum
lcions.
an APPARENTLY DIFFERENT STATE OF Az
FAIRS IN OREGON.
Mr.. Smeed's hopyard was most carefully
Examined, and il was found in very many
instances that hop plants Immediately adj
dining plum and prune trees were not
,ouched, while across the yard, and sep
rated from these trees by many interven-
ng untouched hop plants, the hops were