26 



THE APPLE LEAF IKIPPER 



month earlier would have caught the adults of the first brood. If 

 used at a time when the first brood hoppers are on the trees, or at 

 any time, in fact, when the winged hoppers are most numerous, it 

 seems that the shields can be practicable. The work is slow, and 

 necessitates careful treatment, but is certainly effective. 



WORK WITH A HOPPERDOZER. 



In July, IWS, alfalfa on experimental plots at the Station was 

 being badly injured by leaf hoppers of this species. The insects were 

 in all stages, and were so numerous upon these plants that they fiew 



one 

 ^h i ckness 

 g-alvatnized 



ron 



one thickness galvanized iron 



Fit?. 10. hliiKiain of pan of hopperdozer used in 190s. 



up in clouds when the plants were disturbed. Previously, and not 

 under the direction of this Division, these plants had been sprayed 

 with kerosene emulsion, with disastrous results as far as the plants 

 were concerned. About August 11th a hoi')])erdozer was made from 



