48 MAINE AGRICULTURAI, KXP^RIMENT STATION. I91I. 



Table 8. 



JACKSONVILLE ORCHARD, WEST SIDE, SPRAYED APRIL 12, 1909. 



Treatment. 



Number of 

 Trees. 



Limbs 

 Selected. 



Number of 

 Diseased 

 Leaves. 



Per cent. 



of Diseased 



Leaves. 



Unsprayed 



4 



4 

 5 

 5 



15 

 26 

 22 

 30 



584 



106 



46 



204 



34.3 



Niagara L. S. 1-12 



4 i 



Niagara L. S. 1-15 



2.3 



Niagara L. S. 1-20 



6.1 







Table p. 



ITHACA ORCHARD, SPRAYED APRIL 7, 1909. 



Treatment. 



Number of 

 Trees. 



Limbs 

 Selected. 



Number of Per cent. 

 Curled of Curled 

 Leaves. Leaves. 



Unsprayed 



4 

 4 



4 



5 



28 



27 



35 

 37 



920 

 213 

 273 



427 



41.3 



Niagara Lime-sulphur 1-9 



Niagara Lime-sulphur 

 1-15 



5.9 

 5.3 



Bordeaux 3-3-50 



8.3 



According to this data, increase of control does not show an 

 absokite relation to amount of dilution. Lime-sulphur is some- 

 what more effective than bordeaux. In the case of this disease, 

 however, this is practically of no importance, since, according to 

 Duggar,* it has been definitely established that for control spray- 

 ing must be done before the buds open and later sprayings are 

 of little importance when the early one has been made. Hence 

 the question of leaf injury from bordeaux does not enter into 

 this problem. The advantage of using one form of fungicide 

 throughout the year is of course obvious, but the absolute supe- 

 riority of lime-sulphur over bordeaux in controlling this disease 

 remains to be established. 



Wallace's work on the control of apple scab** brings out more 

 points of interest. The same commercial concentrate was used 

 as in the peach experiments with 2 pounds arsenate of lead to 



^Loc. cit. p. 182. 



** Wallace, E. "Second Report Niagara Sprayer Co. Fellowship on 

 Apple Scab." Cornell Univ. 1909. 



