50 MAINE AGRICUIvTURAI, I;xPE;RIMENT STATION. I9II, 



Professors Melander and Beattie* as a result of their trials 

 recommended for apple scab boiled lime-sulphur at ^-1-5, with- 

 out further dilution. This is practically the concentrated stock 

 solution, and is far too strong for eastern conditions according 

 to experiments so far on record. Such strength, however, they 

 report as very effective without causing serious leaf injury. 



The experiments of Scott and Ayresf in 1909 consisted of 

 a trial of the 8-8-50 self-boiled wash on peaches on a commer- 

 cial scale, using it alone or with arsenate of lead, for controlling 

 peach brown rot, scab and curculio. Very large numbers of 

 trees were included in these trials and the results were in all 

 cases markedly successful, the yield of marketable fruit being 

 increased in some cases by one hundred per cent. In another 

 case the yield of marketable fruit was 10 times that from the 

 unsprayed plot. Reports are also made in this connection of 

 the commercially successful use of this spray in peach orchards 

 of from 15,000 to 35,000 trees. Spray injury resulting from 

 its application was so very small in amount as to be considered 

 negligible. 



For apple scab in Arkansas, Virginia and Michigan Scott| 

 used 4 commercial concentrates of 31° to 33° Beaume density, 

 both kinds of home-prepared lime-sulphurs and bordeaux. 

 These were tried alone and with arsenicals. The tests were 

 made on 11 varieties in the several regions. The commercial 

 sprays were used at dilutions ranging from 1^-50 to 25^-50, 

 with arsenate of lead 2 pounds-50 or Paris green .6 ounces-50. 



The results showed considerable differences, both in respect 

 to foliage and fruit injury and scab control, the variations evi- 

 dently depending largely upon the atmospheric conditions at 

 spraying time and the varieties treated. Greater injury was ob- 

 tained with Paris green than with lead arsenate. The commer- 

 cial solutions used alone were more injurious to foliage than 

 when combined with lead arsenate. 1^-50 appeared to be' the 

 maximum strength consistent with safety. Bordeaux was some- 



* Melander, A. L. and Beattie, R. K. Wash. Agric. Expt. Sta. Pop. 

 Bull. 28. 



■i- Scott, 'W. M. and Ayres, T. W. "The Control of Peach Brown-Rot 

 and Scab." U. S. D. A., Bureau Plant Industry Bull. 174 (iQio). 



t Scott, W. M. "The Substitution of Lime-Sulphur Preparations for 

 Bordeaux Mixture in the Ireatment of Apple Diseases." U. S. D. A. 

 Bureau of Plant Industry Circ. 54 (1910). 



