192 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



4 pounds of arsenate of lead paste alone in 50 gallons of water 

 showed as good scab control as where other plots were sprayed 

 with half of this amount of arsenate of lead combined with 

 recognized fungicides, exceeding that obtained from bordeaux 

 mixture and standard dilution lime-sulphur and only being 

 equalled by the stronger lime-sulphur. 



In 1913 where 2 pounds of the dry arsenate of lead was used 

 in 50 gallons of water scab was better controlled than on any of 

 the other plots except where bordeaux mixture and the stronger 

 lime-sulphur was used in combination with one pound of the 

 insecticide. 



Reference to the tabulated results shows at once that in 1914 

 arsenate of lead was less efficient in controlling scab than during 

 the two preceding years. This fact was also apparent from 

 the condition of the foliage and fruit on the trees all through, 

 the season. However, while these results are not so favorable 

 they by no means contradicted those of previous years. This 

 fact is also shown in the later discussion of the results secured 

 on plots 2 and 3 where only double strength arsenate of lead 

 was used after the first application. On account of freedom 

 from russeting the per cent of perfect apples on plot 11 where 

 the double strength arsenate of lead was used was fully equal 

 to that obtained on plot 4, sprayed throughout the season with 

 standard dilution lime-sulphur, combined with one pound of 

 arsenate of lead in 50 gallons. 



In connection with the discussion of arsenate of lead used 

 alone as a fungicide it should be mentioned that some results 

 reported from certain other parts of the country last season 

 were less favorable than those previously secured at this Station. 

 Jackson and \\"inston in Oregon make the following statement : 

 "Double arsenate of lead, when used throughout the season 

 uncombined with fungicide gave negative results as a remedy 

 for scab."* However, Professor Winston in a letter to the 

 senior writer under date of April 15, 1915, says: "In regard 

 to arsenate of lead you might infer that it is of no value to us 

 as a fungicide; our figures would indicate that, however, I 

 have been told bv certain orchardists that they received very 



*Jackson, H. S. and Winston, J. R. Report of the Hood River Branch 

 Experiment Station for 1913-1914: 17, Oregon Agl. Col. Exp. Sta. 1915. 



