THE RED SPIDER OX THE AVOCADO. 
13 
temporarily, as none remained on the foliage to destroy the young 
on hatching. 
SPRAY ROD VERSUS SPRAY GUN. 
In making a comparison of the spray rod (fig. 9) and the spray 
gun (figs. 10 and 11) it was found that the latter gave better satis- 
faction against the red spider. "Where an orchardist is short of help 
considerable benefit can be derived by using the spray gun, as the 
spray operator can caver the ground much faster than when using 
Fig. 9. — Spraying in an avocado grove with spray rods. 
the spray rod. As the red spider works on the top of the foliage the 
operator can stand off a short distance from the tree, and with the 
use of the spray gun can spray from the bottom to the top of the 
tree by turning the handle of the gun which changes the spray from 
the fan or fog spray (fig. 10) to a long-distance spray (fig. 11). 
The writer has found that growers in using the spray gun often 
neglect to change the disk in the nozzle frequently enough and won- 
der why they can not maintain sufficient pressure while spraying. 
The operator should watch the opening of the disk in the nozzle of 
the gun, and should replace it when it is worn. 
