Daily capital journal. (Salem, Oregon) 1903-1919, 1919-04-10
Prune "Cooties" Really
California hrip, Says
PauIus; Tells Remedies

April. Most Of the eggs are depOs.
ited just under the epidermis in the
fruit stems, young fruit and Leaf stems
The eggs require about eight days to
hatch.
Larvae
BY the time the trees are breaking
into full bloom the adults have done
most Of the damage caused by their
feeding, and Oviposition is at its height
Many Of the earlier appearing adults
are dying off and larvae are begin
ming 20 appear in numbers. The very
s'-s' larvae can usually be found about
March goth, and are In maximum num-
bers on the trees, feeding on the small
fruit and young foliage, from the first
10 the middle of April. Reaching their
full development the larvae drop
from the trees Of their own accord
with falling caleyces, or are blown by
wind or knocked off by rain. After
the middle Of April the number on the
trees diminishes rapidly and by the
last Of April all the larvae are off the
trees and in the ground. Here they
work down into the first three or
four inches Of hard soil below the loose |
surface mulch and construct a tiny
cell where they remain until the fol. 1
lowing spring.
Pupae
The larvae mostly remain as such 1
in these cells until September, when
pupation begins, pupae being most
abundant during October ana Novem-
Der. Many adults can be found in the
ground in December, and by the first
Of January practically all the thrips
are in the adult stage and apparently /
ready to emerge and 60 into the trees
whenever conditions are right. Broad.
Iy speaking, the thrips spend two
months of the year in the adult egg
md laryal condition on the trees aud
he othot ten months Of the year as
arvae, pupao and adults in the ground
Control Measures
The pear thrips is in some respects
IN unusual insect in that 40 remains
n a dormant or semi i-dOrmant eondi-
ion for about ten months of the year. "
on the trees for only .wo
months out Of the twelve. il is able in .
his short time, in the absence Of treat I
nent, to completely destroy all pros I
'ccis Of crop Of fruit in many eases u
within a very few days. The ;rccs are =
ttacked at the period Of bud swelling d
nd blooming, when they are most sus. D
ephble TO injury, These minute in. q
ects come literally in swarms, and p
iay. If left alone, completely destroy
II Of the fruit buds Of an orchard in
our or five days. Many eases have a
cen known where delay Of four or q
i've days in spraying resulted in loss =
I the entire crop Of fruit, and in 4
Dme eases half Of all the bud, wero d
illed in three days after the thrips n
ppeared on the trees in great mum. Y
ers. In view of this condition IL is I,
cry evident that any means Of con u
'ol must he very thorough and done e
! the most exacting manner at the st
roper time. b'
Cultivation th
On gravclly and sandy soils piowing sl
} a depth of from seven TO nine inch, al
: results in killing from 60 to so per Gu
mt of tho thrips present in the soil, IN
ut not sufficient control, as enough OF
rips escape TO cause great injury to WI
le buds the following spring. tn
Spraying mi
A tobacco extract containing 3 "a Du
n cent nicotine, diluted at the rate tn
to 60 in per cent distillate oil er
nusion, kills all the thrips touched to
ID penetratos well in to the pear on
ustcr buds. The pubeseent covering ey
the individual buds in the cluster.
ing resistant to water, seems TO act
j the dimton in distillatc oil emul. pl
on in much the same manner as the sp
lex upon oil in a lamp. tn
bisillato on Emulsion Home made an
Preparation be
To make soap use this formula or
me multiple of same;
Water. gallons, 8; lye (9S per cent?, so'
unds 3; fish oil, gallons, la. tr'
Put the water in caldron or boiler
ID add the lye. When the lye is thor.
ghly dissolved aud the water boil to
(, pour in the fish oil stirring in da
g meantime and boil for two hours. wl
hen the soap has boiled sufficiently jdc
should give a ropy effect when stir &c
d and brought up upon the adlc. -