THE BLACKHEAD FIREWOEM OF CEAXBEEBY 
31 
On the Howe vines in plat A, three applications, at an average rate 
of 391 gallons pier acre, with the mist nozzle produced a gain in yield 
of 18.52 bushels per acre over the check; 89.35 per cent of the berries 
picked from sample areas were free from fireworm injury. On the 
other hand, the same type of nozzle used on McFarlin vines in plat 
H, with four applications at the rate of 485 gallons per acre, produced 
a gain over the untreated vines in this section of 319.23 bushels per 
acre, 93.81 per cent of the berries examined being free from fireworm 
injury. 
Fig. 13. — Mist nozzle equipment used in spraying experimental plats. 
The Speay Gun. 
The spray gun (fig. 11) comprises usually a very large nozzle of 
the eddy-chamber type attached to a piece of tubing of varying length, 
fitted with a device for regulating at will the size and volume of the 
spray delivered through the nozzle. It is of larger capacity than the 
ordinary mist nozzle of the eddy-chamber type and is intended to be 
used only on power outfits where the pressure can be maintained at 
200 pounds or over. In these experiments this type of nozzle was used 
at full-capacity opening with a medium-sized disk and threw a stream 
of spray about 15 to 20 feet long, which broke up into a medium fine 
mist before it reached the vines. 
In the use of the spray gun on plats C, D, E, and F an effort was 
made to fill the tips of the uprights with the spray liquid and also to 
hit the undersides of the leaves by holding the nozzle close enough to 
the vines so that the liquid would be delivered on a nearly horizontal 
