30 BULLETIjST 1032, U. S. DEPARTMENT OF AGRICULTURE. 



spraying plats B and G ^Yith this type of nozzle, an effort was made 

 to hit on a nearly horizontal plane the underside of all the leaves, as 

 well as to penetrate the vines and wet thoroughl}' with the spray solu- 

 tion all parts of the uprights, including the tips, by directing a force- 

 ful stream of spray, as shown in figure 12 h. The main idea was to 

 wet the eggs and also to catch the young larvae in their burrows on 

 the undersides of the lower leaves, as well as to wet any larvse in the 

 tips at the time. 



As will be observed in Table 4, three aj)plications Avith this nozzle 

 on Howe vines in plat B at an average rate of 522 gallons per acre 

 resulted in a gain in yield of 34.18 bushels per acre over the un- 

 treated plat ; 89.74 per cent of the beri'ies examined from this plat 

 were free from injury by the fire worm. On the McFarlin vines in 

 plat G four applications at an average rate of 697 gallons per acre, 

 with this type of nozzle, produced a gain of 153.81 bushels per acre 

 over the check and 91.97 per cent of the sample berries were free 

 from fireworm injury. The small yields of plats A and B were 

 due largely to the fact that since the vines in this section had been 

 very badly infested the previous season, they produced very scanty 

 bloom, and they also appeared to suffer more from frost on May 4, 5, 

 and 6 than the other plats. 



The Mist Nozzle. 



The mist nozzle used was of the eddy-chamber or whirlpool-disk 

 type, somewhat larger than the Vermorel and without the center- 

 cleaning punch of the latter. It is so constructed internally as to 

 throw a medium fine mist in the form of a hollow cone of spray 

 which, depending upon the pressure of the liquid, measures from 12 

 to 18 inches in diameter about a foot from the nozzle. The outfit, 

 as shown in figure 13, was made from galvanized iron pipe one-fourth 

 to three-eighths of an inch in diameter on which four nozzles were 

 placed 11 inches apart and the whole attached to the end of an ordi- 

 nary 8 or 10 foot bamboo spray pole. The first nozzle on the end was 

 set close to the pipe and each succeeding one was set 1 inch farther 

 away than the preceding so that all would be the same distance from 

 the vines when the rod was held by the operator in proper position 

 for spraying. 



The applications with this type of nozzle on plats A and H were 

 made with the primary idea of filling the terminal whorl of old leaves 

 and the new unfolding leaves at the tip of the upright with the nico- 

 tine sulphate and soap solution. As will be seen in figure 13, this 

 spray was delivered on a more or less vertical plane, and no special 

 effort was made to hit the underside of the leaves, entire dependence 

 being placed on a thorough soaking of the tips of the uprights, which 

 was quickly and easily done with this type of nozzle. 



