The San Francisco call., 1904-06-17
COOPER PLANS
VALUABLE WORK
Horticultural Commissioner
Pictures in COlOrs Scales
That Destroy Fruit Crops
MAKES FARMERS WISE
Odd Book Is Compiled for
Instruction of Growers
and to Save Orchards

horticultural Commissioner Elwood
Cooper is causing TO be prepared a
hook Of unique interest and value to all
fruit growers Of California, and. Incl
dentally, to many business interests in
this State that are connected with the
growing. preserving, canning and mar
keting Of fruits.
The contents viii consist Of informa-
ton Of the ready-for-use sort about
scales. the beneficial parasites that
prey upon the scales infesting at one
time or another the orchards of Cali
fornis, and the text viii be illustrated
with illuminated cuts that will accu-
rately represent the damaging scales
that cause the ruin of trees and crops
when their pernicious industry is per-
mirted TO remain unchecked.
BY means Of the pictures every at
rentive observer who has to do with the
care or ownership Of fruit trees viii be
able 10 identify each and every variety
~ scale that has yet appeared in Cali
fornis, and the text viii give informa-
lion concerning the beneficial parasite
that has been found to devOur any par
ticular sort Of scale.
DIAGNOSIS EASY.
Ia brief, the book, with cuts and text
win be a means in the hands Of inter
ested persons TO enable them TO make
al once their own diagnosis Of any det-
r.mental growth that is found in the
orchards. il such has ever previously
appeared in the State. and Will also tell
exactly what parasite is adapted to the
emergency.
Many scales that were once the source
of large losses have been kept in check
by the beneficial parasites that have
been introduced from foreign lands
Little is being said about them because
their menace was put aside. Some of
them may have been forgotten, or they
may be new TO fruit growers in isolated
localities. No scale has ever been COM
pletely annihilated by the parasites. In
deed, il complete destruction of any
variety Of scale could be accomplished
ID would be a misfortune in all proba-
bility.
The beneficial parasites will feed on
only one sort Of scale. AS long as there
are a few scales remaining, the food
for the parasites sufficient to keep a
few alive remains.
STARVING PARASITES.
II there were no food Of the particu-
lar sort required by each sort Of bene-
fcisl parasite, then the parasite would
starve.
II then the scale should reappear at
any time il would be necessary to go
al over the ground Of arming anew
against IL. and time would elapse in
which considerable damage might be
done.
PICTURES ARE ACCURATE.
The cuts that are in preparation for
the forthcoming book have been ap-
proved by Alexander Craw. whose
know ledge Of scales and parasites is
based upon many years Of experience,
during which he has labOred to find
and exterminste one and to cultivate
the other.
A sufficient number Of copies of the
book viii come from the State Printing
Office 10 supply those who are in need
~ them. The knowledge contained in
them ought to constitute every reader
an assistant in some degree Of the
states officer TO quarantine fruit tree
pests. by giving ready information con-
cerning what is happening in the or
chsrds in all parts Of the State.