18 



FARMERS BULLETIIT 845. 



Spraying. — ^The most effective spray for the gipsy moth is arsenate ■ 

 of lead paste applied to the foliage at the rate of 10 pounds. to 100 

 gallons of water. It is necessary that the treatment be thorough and 

 the application even, if best results are to be secured. For small 

 operations the ordinary orchard sprayer may be used with one or 

 more lines of hose equipped with nozzles of the Vermorel or Bordeaux 

 type. In case large shade trees on valuable park or woodland are to 

 be treated, however, the use of a high-power sprayer is more economi- 

 cal. The type that has given the most satisfactory results m the 

 gipsy-moth work develops sufficient power to throw a solid stream of 

 spray into the trees. The nozzle is constructed so that the stream will 

 break into a fine mist high in the air, and this results in very satis- 

 factory and rapid treatment. (See fig. 11.) With such a sprayer it 



FiG.9.— Appl3ang trei-liiuuliiii; m ii. nal lo protect the foliage from gipsy-moth caterpillars. 



