ORCHARD SPRAYING EXPE^RIM^NTS. 



45 



in the season, but estimates pointed to bordeaux, commercial 

 lime-sulphur and self-boiled mixture as effective in the order 

 named. In Nebraska the efficiency of commercial lime-sulphur 

 for scab on the Winesap variety equalled 3-3-50 and 4-4-50 

 bordeaux. Dilutions of 1-25 produced slight leaf injury. Self- 

 boiled mixture caused no damage, was less adhesive and less 

 effective, preventing only the early infections. Bordeaux caused 

 fruit russeting but no leaf injury. 



The experiments of Prof. Brooks*- at New Hampshire, co- 

 operating with the Bureau of Plant Industry, embraced, in ad- 

 dition to the home-prepared, commercial lime-sulphurs and bor- 

 deaux mixture, commercial bordeaux and a so-called unboiled 

 lime-sulphur mixture; in preparing the latter the lime was 

 slaked and diluted to half the final volume, and the sulphur 

 added to the remaining 25 . gallons. These were then united 

 to form a purely mechanical mixture of 50 gallons. Trees 

 used were Mcintosh. Results were as follows. 



Table 5. 





Times 

 Sprayed. 



Per cent. 



Badly 

 Scabbed. 



Per cent. 

 Slightly 

 Scabbed. 



Per cent. 

 Clean. 



Self-boiled L. S. 15-10-50. . 



5 



2.9 



45.0 



52.1 



Lime and Sulphur Mix- 

 ture, 9-6-50 



5 



10.2 



57.8 



32.0 



Boiled L. S. 2-1-50 



5 



3.8 



42.6 



53.6 



Commercial L. S. 1-24 



5 



0.9 



9.4 



89.7 



Commercial L. S. 1-49 — 



5 



1.3 



16.5 



82.2 



Bordeaux 3-3-50 



5 



1.2 



18.2 



80.6 



Commercial bordeaux 



5 



1.7 



24.5 



73.8 



Self-BoiledL.S. 15-10-50.. 



4 



9.5 



55.8 



34.7 



Lime and Sulphur Mix- 

 ture, 9-6-50 



4 



7.1 



46.4 



46.5 



Bordeaux 3-3-50 



4 



1.2 



9.4 



89.4 



Bordeaux 4-4-50 



4 



2.7 



5.6 



91.7 







21.9 



45.2 



32.9 







The percentages here again indicate an efficiency of the self- 

 boiled lime-sulphur considerably lower than the commercial or 



* Brooks, Chas. N. H. Expt. Sta. 19th and 20th Reports (1908). Re- 

 port of Dept. of Botany, pp. 385-389. 



