10 FARMERS’ BULLETIN 674. 
SPRAY APPLICATIONS TO NURSERY STOCK. 
While definite dates can not be given for the application of sprays 
to nursery stock, it follows in the case of trees budded in the fall, 
where the original stock is allowed to put forth a good growth in the 
spring, that it is sometimes advisable to spray during April, but only 
when thrips have become quite numerous and for the purpose of 
ridding the trees of them before the scion has grown sufficiently to 
attract them. Preferably the stock should be largely cut back as 
soon as the bud is well under way, 
and this is generally done in Tulare 
County before May 1. The prun- 
ings should be burned in every case 
to destroy eggs and larve which may 
be present. The growing scions 
must then be watched carefully, and 
as soon as thrips appear in numbers 
spraying should begin. They should 
be further watched with the same 
care throughout the remainder of 
the growing season and sprayed as 
often as the abundance of thrips 
makes them liable to severe injury. 
Nursery stock will usually require 
from three to five applications a 
season, depending largely on the 
amount of growth it produces. 
Once the scion has completed its 
first growth and become distasteful 
to thrips the next most important 
growth will usually occur late in 
July or in August. 
Fig. 5.—Correct spray rod and nozzle connec- To summarize, the first applica- 
tions: a, Two nozzles fitted on “Y” branch; tj9n should be made when thrips 
b, shut-off at base of spray rod. (Original.) ; r 
begin to get numerous on the spring 
growth, usually between April 15 and May 15, after which from two 
to four further applications will be necessary, according to the con- 
ditions of infestation. - 
SUGGESTIONS ABOUT SPRAYING. 
The gasoline-power outfit, by reason of its large nozzle capacity, 
simplicity, reliability, and comparatively low cost of operation, is the 
only class of sprayer here recommended for spraying bearing orchards, 
young orchards in excess of 10 acres, and large nurseries. Hand- 
power outfits, when of the right type and capable of maintaining a 
pressure of not less than 125 pounds, are suitable and even preferable 
