No. 7. DEPARTMENT OF AGRICULTURE. 641 



TABLE I. 



Lime-Sulphur Solution vs. Bordeaux for Apple Scab 



o 



S 



3 



Spray Mixture Used. 







1 Commercial lime-sulphur solution (IJ to 50) plus 2 pounrls arsenate of lead, 2.2 



2 Home-boiled lime-sulphur solution (2-4-50) plus 2 pounds arsenate of lead, (i.l 



3 I Bordeaux mixture (3-4-50) plus 2 pounds arsenate of lead, 6.2 



i i Check, not sprayed, . S>9.8 



From this table it Avill be seeu that tlie home-made lime-sulphur 

 solution and the Bordeaux mixture both held the scab down to 

 about six per cent, of the crop, while practical!}- all of the unsprayed 

 fruit was scabby. The plot sprayed with the commercial solution 

 had the lowest percentage of scabby fruit (2.2 per cent.) but this was 

 probably due to a difference in the plots and not in the fungicides. 

 Plot 1 contained medium-sized trees easily sprayed while the trees 

 in plots 2 and 3 were large and rather difficult to spray T\dth the 

 outfit used. 



It would appear from these results and those obtained in prev- 

 ious experiments that the efificiency of the lime-sulphur solution as a 

 remedy for apple scalp need be questioned no longer. 



EFFECT ON THE FOLIAGE 



Directly after the second spraying of the Ben Davis and Yorks, 

 the foliage of these two varieties showed injury to a noticeable ex- 

 tent. This, however, was to be expected as the unusually cold and 

 wet weather of April and May was particularly favorable to spray 

 injury. 



On the lime-sulphur plots the leaves of the young shoots were 

 somewhat scorched about the margins, and as a consequence, some 

 of them were curled and distorted. Also on some leaves a few dead 

 spots were to be seen and for a time it looked as though serious in- 

 jury might ensue. The leaves, however, showed no further injury 

 as the season advanced, even after the next application. By mid- 

 summer practically all evidence of injury had disappeared and dur- 

 ing the remainder of the season the foliage was in excellent condi- 

 tion. There was no apparent difference between the foliage of trees 

 sprayed with the commercial solution and those sprayed with the 

 home-boiled. 



The foliage injury caused by Bordeaux mixture was markedly 

 greater than that caused by the lime-sulphur preparations and dif- 

 fered in that it became worse as the season advanced. The leaves 

 were more or less sj)otted with circular brown areas and a consid- 

 erable percentage of them turned yellow and dropped. 



The trees sprayed with the lime-sulphur solution went through 

 the season with much better foliage than those sprayed with Bor- 



41—7—1910 



