The Hood River glacier. (Hood River, Or.) 1889-1933, 1912-10-10
San Jose Scale

The San Jose scale is one of the seri-
Gus insect pests. Badly infested young
trees are so seriously injured that they
may die within two or three years un-
less the pest is destroyed. Older trees
that have come into bearing become so
badly weakened in a season or two
that they do not produce marketable
fruit. These badly weakened trees
recover slowly after the scale has been
eradlcated so that the effect of the in
jury is longer lasting than the period
OF infestation. There is no insect that
we should watch more closely than this
scale.
When a young tree becomes infested
there is no portion of the tree above
the ground that is not subject to the
attacks of the scale. The trunks and
branches that are well covered with
the scale have a rough, gray appear
ance. Close observation may show the
surface completely covered with the
scale. Many times they overlap and
are, therefore, not as easily detected as
when more scattering. Under the con-
ditions as described the we'll coated
areas do not show the red ring sur
rounding each scale as occurs on Young
tWlgs, leaves and fruit being particu-
larry conspicuous during late summer.
There are several diseases that turn
the fruit red, but the San Jose scale is
easily distinguished since the red ring
has within 1t the scale which is gray to
black IN color, round, button shaped
and with a small plmple-like elevation
at the center. The size Of an individ-
ual scale seldom exceeds the size of the
head of common pin.
An attempt is being made to call the
attention of the growers of all kinds of
Tree fruits to few facts about this
scale among which is the recent spread
IN some orchards where light infesta-
uon was overlooked last year with the
results that marked proof of its work
can now be had. The truth of his
statement is quickly realized when il
Is understood that during the later mart
oi spring the old scales which have
| survived the winter begin to produce
Their young, which are born alive
lhesee young scales mature in about one
month ana IN turn produce young. AS
many as 1--WE generations are kpoWn tn
occur IN a single season. Should an the
INDIVIDUALS OF each of the five genera.
tlons survive and produce vounp NJ
their natural rate of reproduction tbe
progeny OF a single scale for one sea
| 00O, 900. '""' '''o''-
knowing the possible rate Of renrod
uetoh and the fact that the Young scale
are small, spider-like, six-legped bodies
which crawl long distances. with new
generations occurring regularly tbrougb.
CUT Tie sumner, one is not surnv;so4
at the apparent poor results obtainod
Where spraying to control the scale Las
oeen done indilferently -leayng nov %
| tlohS OF the tree without even wetf;n,
Ihe bark, or spraying one side orits
lhe method that is effective in ~.
control Of the San Jose Scair is 70 70 I,;II IN
every scale. " ALL
10 combat the scale successfully ,aro
should be taken to observe tbs frni,
on every tree to note if anv iDfestat;"S
mas taken place and if so 10 mai, tsS
Tree. Trees, the fruit of which ~
become infested with scale ara ,,s,,lT., 'ii'e
wen piastered, the fruit only beconinSS
infested when the limbs and small l,'ef /
t"lgs become we'll coated u;-tnl -'''il
strength Iime-sulphur should be apnIie5
on every infested tree before tbat fti'eI fsii
rams begin. If it is impossibIa ,t g. ia,l sl
the work on time the same sborIJ IA w Nv
uone as early in the winter as pose,bIo .'j ~
even II weather conditions are sJyasle'