18 



EXPERIMENT STATION BULLETIN 



HOURS 

 30 

 25 

 20 

 15 

 10 

 5 



ol— 



25 

 20 

 I 5 

 10 

 5 

 



I 5 



10 



5 







20 



I 5 



10 



5 







H 







F 



iiki 



1 



 



MAY 



b 



D2 



D3 



D4 



JUNE 



JULY 



Figure 12. — Seasonal spray schedules on four farms which 

 obtained unsatisfactory control 



