ANNUAL REPORT, 1932 



29 



sulfurs were used in all sprays after the special curciilio spray. In the sprays up 

 to the calyx spray, lime-sulfur was used as the fungicide. 



Tests were continued with Kolofog and flotation sulfur, both of which showed 

 great promise in 1931. Flotation sulfur was available for the first time in a dry 

 powder form. This was much more convenient to handle than the paste form and 

 l^roved fully as effective. It marked a distinct advance in the manufacture of this 

 product. Kolofog and flotation sulfur (paste and dry) were used throughout the 

 season in one-half of the block in which they were tested. The remainder of the 

 trees received lime-sulfur up to and including the calyx spray and the new materials 

 for the remaining sprays. 



While the season was not particularly favorable for spray burn or the develop- 

 ment of scab, considerable foliage injury followed the use of lime-sulfur, and un- 

 sprayed checks showed sufficient scab to infect nearly 60 per cent of the harvested 

 fruit. No foliage injury or damage to fruit resulted from the use of any of the 

 wettable sulfurs. 



The value of these materials in controlling disease and insect pests is shown in 

 the following table, based on examination of the Mcintosh crop at harvest. 



Percentage Percentage of Fruit Showing 



Treatment of Clean Injury From: 



I'"ruit CurcuUo Codling Scab 



Moth 



Lime-sulfur ( 85 3 9 1 



Lead arsenate \ 



Lime-sulfur ) 



Lead arsenate r 95 1 2 0.5 



Lime ) 



Mulsoid sulfur ) 8S 5 4 0.8 



Lead arsenate ) 



Flotation sulfur i 



300-mesh sulfur [■ 91 2 5 1 



Lead arsenate ) 



Dritomic sulfur (92 2 4 1 



Lead arsenate \ 



Flotation sulfur (dry) 86 1-|- 3 6 



(entire season) 



Flotation sulfur (dry) after ) 96 2 1 + 



Lime-sulfur f 



Flotation sulfur (paste) 80 0.2 2 18 



(entire season) 



Flotation sulfur (paste) after | 9.5 0.3 1 5 



Lime-sulfur ) 



Kolofog (entire sea.son) 89 0.5 3 6 



Kolofog after \ 94 0.2 1- 4 



Lime-sulfur I 



Check 23 27 19 58 



In these tests the lime-sulfur — lead arsenate combination gave equally good 

 control of scab when hydrated lime was_^added, and the lime reduced the amount 



