492 



BULLETIN 333 



is doubtful whether some of them will recover. Several English elms, 

 which are more subject to injury from this beetle than are American 

 elms, had to be cut down. A part of the injury to these trees, however, 

 was caused by the elm leaf -miner. 



The condition of the trees in 1910 was such that it became imperative 

 to take preventive measures before another season should pass. Accord- 



FIG. 164. Spraying a high elm with a Hardie machine 



ingly, the Board of Trustees of Cornell University made a liberal appro- 

 priation for spraying the elms on the university grounds, and preparation 

 for the work was at once begun. The problem seemed a rather large 

 one. However, the spraying has now been carried through two seasons, 

 and, while nothing startling has been developed in the way of new methods 

 or apparatus, the work has proved to be practical, economical, and efficient. 



