The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1890-10-02
HOP LOUSE'S HABITS.
The Ways Of the Pest Described
by q Grower.
VERY PROLIFIC INSECT
TriIIssss 81 InAfvfdusIs Css bs PecdaesA
Frsn : single ssem-Methsr-
saequasnis Fields

Mr.. H. +. Levy. who has hop ranch 1t
snoquaimie. and NJ. George W. Tsb5<sss.
. Gilman hop-rAiser. were In the caty last
night stopping at TIE Snoqua mic hotes-
From them some interesting facts were
learned concerning hops and tie nop-louse.
In talk with Posr-IyTELLrsKScEK reporter
and with Mr. Tib5ests, Mr.. Levy said ne
estimated the ysesd Of the SnoquAimie feds
af about 80 tons. against e55 last year.
The crop there viii probably ali be gathered
b. next Thursday ABOUT LOO Indians
have been empsoyed in the yards this sea-
son and l50 whites In regard 10 the hop
louise Mr. Levy declared thar although this
Vas the first year Il bad appeared in large
enough quantities to do any damage. yet !.
bad already harmed the yield more than
most growers were wiling 70 admit
Yesterday" continued Mr. Levy. Il
was ouf looking It the plum trees. aid
found the louise had gone 10 shem % lay its
winter eggs The idea of looking as the
plum trees Was suggested to me By the re-
port Of the entomoogist, c. v. Riley, IN
the 1858 report Of the commissioner Of agri-
culture. which Senator squire sent me.
This report contains an interesting article
on the louise - he appears in the yards OF
the East, especially in the neighD0rhOod Of
Herkimer, WaferyIlie and Cooperstown.
New York. According to this account the
little glossy black eggs Of the hop iouse
can be found in the spring attached TO the
terminal twigs Of the plum tree. and the
eggs are especially numerous in the more or
less protected cfevices Of the twig. From this
winter egg there batches . m-motner,
somewhat stouter and with shorter legs
and honey tuoes than are found in the in
dividuals of any other generation On the
plum trees In the spring three generations
are produced. The first two are wingiess
and the last ID winged and Is called mi
grant. for II inssincsivcsy dies TO the hop
plant, which il free from attack during the
development of the other generations.
"a number OF generations are produced
upon the hop till autumn, and during Sep
tember winged females are again pro-
duced. She 10 called tbs return migrant
and she goes back insfincsTvely to the plum
trees. Here she settles. and IN the course
Of few days, according to the weather,
produces some three or more young. The
latter are the true females and never be-
come winged A bit later the true winged
male Is developed on the hop. and he Is
said to be the only real male of the whole
series He flies to the plum trees where
the females are. and the twigs are thus
stocked with winter eggs.
According to this article read twelve
generations may be produced during the
year, but there Is irYeguianty in the de-
veiopment Of these generations. and the
return migrant from the hop is developed
at the end Of the season, whether from in
dividuais Of the fourth, fifth or twelfth
generation. Each Of hefemsies born during
the summer is capable of producing 100
young, an average of three . day. Each
generation begins to breed the eighth day
after birth, and so the issue from . single
of the summer. The offspring of single
stem-mother may. under favorable con-
ditions for breeding, blight hundreds of
acres Of hops in the course Of two or three
months.
There is one good thing" continued
Mr.. Levy, sand thai il the h0plouse does
not fy far; and 80 if ali the plum trees
about ranch are destroyed the basis OF
supplies. SO to speak. for the louise is cut
of. or at least such has been theexperience
in the East So from my present knowl-
edge in the matter. l should say the most
effective way to destroy the pest was to
burn up all the plum trees near the hop
fields. II may, however, turn out that the
louise in this state may breed on other
twigs than those of the plum-the pear,
apple or willow. for example. Accord
ingly, ! shall watch very closely the twigs
of all these trees to see If the females,
which are already beginning to return
from the hop to the plum, settle upon
them.
THE damage done by the louise does not
alwavs show upon the outside. Ii eats
away the heart of the hop, which then
molds and turns black. You can often
see hop which is all right on the outside,
but break it open. and you will find it
black and spoiled"