SiATE.- i '-
United States Depart,-,e;;t of ':riculture
Bureau of Entomology and Plant Quarantine
AN ADJUSTABLE NOZZLE C.7 U IN .:',
BEETLE CONTROL ...
By James C. Evenden,
Division of Forest Insect Investi>ationsl/
When a tree has been successfully attacked by bark beetles,
its life can not be saved. Conse:luently the prevention of timber
losses resulting from attacks of the-: bet les is based u,; .. he
destruction of the insect broods beneath the bark, to prevent their
emergence and subsequent attack of other trees. In combating
outbreaks of the mountain pine beetle (-__i.':_!:---! mont ooae
Hopk,) in lodgepole pine two methods of t. ating standing trees
are now in general use. With one the infes' portion of the boee
is sprayed with an inflammable oil and burned. 'hen this method
is properly perforroed, the temperatures that are developed beneath
the bark are lethal to all insect life. it the other the sae
technique is employed to cover the infested bole with a spray which
penetrates the bark and kills the insect brood beneath. Eoth
methods require that the infested portion of the bole be prc;:"-:rly
sprayed, and when the infestation e.< ;ends to such a height that
this can not be done the trees must be felled for sub.:_e-:uent
The equipment used in applying V'.- e sprays consists of a
small, portable. 3 --gj.lon, oon;pressed-air sp.yer, a telescopic
extension spray rod,2/ and a special nozzle with an aperture of
0.052 inch which provides a small soli.1 st...a necessary to prevent
waste. Efficient use of this equipment ..pended upon a nozzle
which could be adjusted to a fine spray to treat the lower bole
and still have a solid stream available with which to reach the
upper heights of infestation. To meet this ..uirement an attach-
ment for the special nozzle (fig. 2, I) -as developed which enabled
i/ The writer is indebted to T. T. Ter,':ll, Forest Insect
Laboratory, Coeur d'Alene, Idaho, ..i;d to '.. .jirman Lock and Machine
Shop for valuable assistance in the development of this nozzle.
2/ Evenden, J. C. A Telescopic Spray Exte.nsion Rod for Use
in Bark Beetle Control Work. 2ur. E:,t. and Plant Quar., ET-142.
the operator J .. "'- an instant change fro.-:i the spray to the solid
stream or from the stream to the spray, although the extension rod
was fully extenrd.d.
This at-- : et is easily fitted to the special nozzles, and
when set with the -'ei--;ltc: o.' (fig. 1) lying horizontally over the
extension rod, the strea,. strikes the oval deflection plate (fig.
2, D) and is broken into a fan-shaped spraY. B1, flipping the exten-
sion rod the wei ._'ted lever is thro'.n to the left (figs. 3 and 4)
and thus re..oves the deflector fro:.- the course of the stream.
The different parts (fig. 2) used in the construction of this
attachment are not e pensive or difficult to make. The bearing A
for the lever rod C is a piece of --inch copper tubing 2- inches
lonr, pressed t otherr on one side to provide rigidity. This
bearing is soldered to the clamps E and F to that it will cross the
axis of the nozzle (fig. 3) at a slight angle. The lever C is a
piece of bronze soldering rd 1/8 inch in diameter and approx-
imately 4-3/4 in.:s long. The washer B is soldered to the lever
rod (fig. 4) to provide a turning surface and to prevent the rod
from slipping forvard in the bearing. The deflector plate D,
which is of 2 .-..e sheet brass and t'.isted as shown in the
illustrations, is set at a slight angle (fig. 3) to the bore of the
nozzle, so that the stream strikes the plate a trifle below the
center. Ti:e face of the plate is slightly oval or rounded tran-
versely, to produce the desired fan-shaped spray, which gives
adequate coverage with a once-over sv:eep.
Expla:..iation of Illustrations
Figure 1.--Nozzle I attacL-.e, t set so as to break the small strea'n
into a fan-shaped spray.
Figure 2.-Ur:- .. .':.leJ attach.nent.
Figure 3.--Front of nozzle and attah-l.2cnt, showing construction.
Figure 4.--Side view of nozzle and atta:hTient.
UNIVERSITY OF FLORIDA
3 1262 09240 9548l fItllll IIIIIlI
3 1262 09240 9548