330 PESTS OF ORCHARD AND SMALL FRUITS 
of the opening buds. The adult thrips, which causes this injury, is 
a small, winged insect with sucking mouth parts. It comes out from its 
winter hiding pares in the ground at the time that growth first starts, 
and as soon as the bud 
scales have parted, works 
its way down into the 
flower, puncturing the tis- 
sues and sucking the juices. 
Egg laying begins later, 
and the immature thrips 
feeds on the tender leaf tis 
sues for two or three weeks. 
Then it drops to the ground, 
penetrates the soil to a 
depth of three or four 
inches, and remains there 
until the following spring. 
Direct control is possible 
by means of timely and 
thorough spraying with tobacco extract (the commercial preparation), 
to which has been added distillate oil emulsion so as to make a 2 per 
cent solution. The emulsion is prepared 
by dissolving 8 pounds of whale-oil soap 
in 3 gallons of boiling water, and adding 
5 gallons of distillate oil (28 degrees 
Baumé), at once driving the mixture 
through a spray pump into a tank or 
barrel. One gallon of the emulsion to 24 
gallons of the tobacco water will give a 
2 per cent solution. The spraying must 
Fic. 512. — Expanding buds killed by the Pear 
Thrips. Original. 
be done just as the buds begin to un- Fye. 513.—The Pear Thrips. 
fold, and may need to be repeated. Enlarged to fifteen times nat- 
Deep plowing followed by thorough ural-sise. Original. 
cultivation in the fall, to disturb and destroy the pupating larve, is 
of value. 
