applications gave practically perfect protection against scab, but the use of 

 lime-sulfur for all applications gave protection which was essentially as good. 



Sulfur dust gave satisfactory' control of scab. In Mcintosh orchards there 

 was an average of 3.5 per cent scabby apples on plots dusted with sulfur, while 

 on the check plots there was an average of 65.0 per cent scabby apples. No 

 proof was secured that it is necessary to substitute copper dust for sulfur dust 

 for the preblossom applications. 



Lime-sulfur-lead arsenate spray caused foliage injury, and this was not pre- 

 vented by the addition of calcium caseinate spreader. Leaves on trees dusted 

 with sulfur or sprayed with dry-mix sulfur-lime were not visibly injured. 



The addition of calcium caseinate spreader to lime-sulfur-lead arsenate spray 

 resulted in a reduction of about 50 per cent in the amount of russeted fruits 

 on Gravensteins. 



There was a larger percentage of russeted apples on plots on which Bordeaux 

 mixture or copper dust was used for preblossom applications than on plots 

 sprayed with lime-sulfur or dusted with sulfur at all applications. 



In the Baldwin orchard, there were three times as many leaves with frog-eye 

 leaf-spot on cheek trees as on trees dusted with sulfur. In this orchard, 7.2 

 per cent of the fruit on check trees became infected with black-rot and the 

 disease was present on 0.9 per cent of the fruit dusted with sulfur. 



The costs of various treatments are recorded and compared. The costs of 

 spraying and of dusting are not very far apart. 



Table 1. — Scab on Leaves 



Variety* 



Baldwins 



Mcintosh 



Mcintosh 



Mcintosh 



Mcintosh 



t Treatment 



Per cent 

 Scab 



r Check 



] Copper dust, prepink and pink : snltiir dust at calyx application 



[ Sulfur dust 



f Check 



•1 Copper dust, prepink and pink : sulfur dust at calyx application 



L Sulfur dust 



f Check 



I Sprayed with Bordeaux, prepink and pink ; calyx application of 



J lime-sulfur , , 



1 Spra^eil with lime-sulfur-lead arsenate, without spreader 



I Sprayed with lime sulfur-lead arsenate with spreader 



[ Spra.ved with dry-mix sulfur-lime 



f Check 



•I Copper dust, prepink and pink ; sulfur dust at calyx application 



[ Sulfur dust 



Check , ,. ^. 



Sprayed with Bordeaux, prepink and pink ; calyx application 

 of "lime-sulfur . ^ ^ , 



Sprayed with lime-sulfur-lead arsenate, without spreader 

 I Sprayed with lime sulfur-lead arsenate with spreader 

 [Sprayed with dry-mix sulfur-lime 



24 



7 



11 



27 



8 

 14 



45 



1 

 1 

 1 

 2 



30 

 4 

 7 



34 



1 

 1 

 1 

 3 



• Separate orchards indicated by brackets, 

 t Up to June 9, through calyx application. 



