, ORCHARD SPRAYING e;xPe;RIMENTS. 



49 



50 gallons. The variety tested was Rhode Island Greening, 

 with the following results.* 



Tabic 10. 



Treatment. 



Number of 

 Trees. 



Number of 



Apples 

 Counted. 



Per cent. 

 Sound. 



Per cent. 

 Russeted. 



Per cent. 

 Scabby. 





. 5 ' 

 5 

 6 



1,663 

 2,632 

 2,332 



2.5 

 52.0 

 9.9 



29.7 



3.7 



82.2 



42.3 



Linie-sulphu r, 1-30 -(- 1 e a d 



3 6 



Bordeaux mixture-|- 1 e a d 



3.0 







Wallace also gives a table showing the effect of applications 

 at different times. According to this, one spraying of lime- 

 sulphur after the petals fall was superior to bordeaux used at 

 that time or before the blossoms opened, both as to scab control 

 or freedom from spray injury. Only one tree was used in each 

 division of this experiment and the results must be considered 

 with this fact in view. It is also proper to note that the other 

 experiments involved a small number of trees per plot. 



Prof. Bethune** reports the results of commercial lime-sul- 

 phur for controlling apple scab and pear scab {Venturia Pyrina 

 (Aderh.) Snow apples received 3 applications at the usual 

 times of 1-25, 1-40 and 1-40 respectively. The results gave 99 

 per cent of unaffected fruit. In one block where the second 

 spraying was omitted 85 per cent was scab free. The first ap- 

 plication caused slight tip burn of foliage but no fruit was rus- 

 seted. 



Flemish Beauty pears received 4 successive applications of 

 1-9, 1-25, 1-40 and 1-40, entirely controlling the fungus. The 

 1-25 strength caused slight leaf injury; 1-40 did no harm. 

 vSpraying with bordeaux proved less effective. 



* Adapted from original table. 



** Bethune, C. J. S. Rept. Ontario Agric. College and Experimental 

 Farm (1909), PP- 34-35- 



