44 MAINE xVGRICULTURAL EXPERIMENT STATION. I9II. 



Strengths were used, and lime-sulphur (Beaume 20°) at dilu- 

 tions of i-io, 1-18, 1-20, and 1-20 in successive applications. 

 Bordeaux caused no injury in either season. In 1908 the 1-18 

 lime-sulphur of the second application resulted in very slight 

 injury; the third at 1-20 inflicted noticeable damage. The 

 fourth spraying at the same dilution had no further bad effect. 



In point of efficiency Bordeaux was pronounced slightly bet- 

 ter on the basis of actual figures, with a difference in its favor 

 so small as to leave open the question of its superiority. 



In 1908 Mr. W. J. Morse* of this station attempted the con- 

 trol of apple scab with the self -boiled mixture of Scott's for- 

 mula prepared with hot and with cold water, and bordeaux 

 mixture, 3-3-50, making 3 applications. Several varieties fail- 

 ing to set fruit, the data were confined to 4 Fameuse trees in 

 each plot. Scab-free fruit was as follows : 



Table 4. 



Treatment. 



Bordeaux 



3-3-50. 



Self-boiled 

 Hot Water. 



Self-boiled 

 Cold Water. 



Unsprayed. 



Per cent, clean fruit 



50 



33 



16 



1 



No definite conclusions were drawn. Observations pointed 

 to the prevalence of the disease in that season, as indicated also 

 by the high per cent of scabby fruit. The increased strength 

 of lime-sulphur prepared with hot water is indicated in its 

 greater control compared with the cold water preparation. 



Scott's experiments in 1908** were made in Georgia, Arkan- 

 sas, Nebraska and Illinois and in New Hampshire in coopera- 

 tion with the state experiment station. Results showed self- 

 boiled 10-10-50 and bordeaux 2-4-50 to be equally effective in 

 controlling cherry leaf spot (Cylindrosporium padi, Karst.) on 

 ]Montmorency. Self -boiled 6-6-50 and commercial concentrates 

 at 1-40 gave slightly less control. Attempts to determine the 

 relative effectiveness of the sulphur sprays and bordeaux for 

 apple scab on Winesap in Arkansas had to be abandoned early 



* Morse, W. J. "Notes on Plant Diseases, 1908, Maine Agric. E,xpt. 

 Sta. Bull. 164, (1909). 



**Scott, W. M. "Lime-Sulphur Mixtures for the Summer Spraying of 

 Orchards". U. S. D. A. Bureau Plant Industry, Circular 27, (1909). 



