152 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 



in the second brood, except in the Nokes orchard, because in the other 

 orchards, there were more side worms than apples and many of the 

 calyx wormy apples also had side worms. 



High Efficiency of the 5 lb. L. A. Spray. The first three divisions 

 of the table show combinations in which the first spray was applied. 

 A glance down the calyx wormy column of the first brood shows that 

 even under the extremely wormy conditions prevailing, the 80 per 

 cent of worms that went into the calyx ends practically all perished, 

 giving an efficiency of 99 or 100 per cent in every case. Even in the 

 second brood with the number of worms increased many times, the 

 lowest calyx efficiency is 95%- and the average almost 98% while 

 the year total is 99%. 



SUMMARY OF RESULTS OF DRIVING SPRAY TESTS, 1911 

 (Using Lead Arsenate 5 lbs. to 100 galloas) 



Average efficiency. 



100 



1-1-0 



Average efficiency . 



W... 



N... 



1-0-0 



Average efficiency. 



Average efficiency . 



79 



w. 



N. 



Average efficiency. 



2 The 95% efficiency is obtained by subtracting the average of 4 wormy apples 

 on the sprayed trees in the (W) orchard from the 80 on the unsprayed trees, leaving 

 76 killed out of 80, or 95% killed. 



