SPRAYLNG EXPERIMENTS AT GRAVETTE, AKK. 



19 



later, had 67.7 per cent of the crop affected. (PI. VI, figs. 1 and 2.) 

 This emphasizes the fact that in order to control the disease the treat- 

 ment must be given before infections take place. 



SPRAYING EXPERIMENTS AT GRAVETTE. ARK. 



At Gravette. Ark., in the orchard of Mr. P. A. Rodgers. a combined 

 experiment and demonstration was conducted. A block of 120 large 

 Ben Davis tree- was divided into 5 plots of from 12 to -10 trees each. 

 Plots 3 and -1 constituting a demonstration of GO trees. Plots 1 and 

 2. from which poor results were expected, were limited to a dozen 

 tree- each, and Plot 5. the check, consisted of 12 trees. Early in 

 the season 3 average trees in each plot were selected and at picking 

 time the crop, including all windfall-, was sorted and counted. The 

 results are given in the following table. 



Table III. — Treatment and results in apple-blotch experiments, Rodgers ore-hard. 



Gravette, Ark., 1907. 



Plot numbers 



(3 trees of each 



plot). 



Treatment with Bordeaux mixture i 5-5-50 formula). 



5,cheekiGtrees,, 

 no treatment. 



Apr. 

 Apr. 

 Apr. 

 Apr. 



Apr. 11 

 Apr. 11 



May 

 May 



June 

 June 

 June 

 June 



5 Julv 



5 Julv 



5 July 



5 Julv 



Aug. 6 

 Aug. 6 

 Aug. 6 

 Aug. 6 



Fruit picked September 

 23 to 26. 



Sound 

 fruit. 



y umber. 

 1,625 



5.2-2 

 5,093 



Blotched fruit. 



Number. 



1.156 



2. 343 



432 



393 



4,632 



Per ct. 

 41.6 



32.9 



55. i 



The results here confirm those obtained in the Bentonville orchard, 

 and -how that the application made on May 2. just before infection 

 began, was more important in the control of apple blotch than all the 

 others combined. Plot -i. which was sprayed according to the dem- 

 onstration schedule, had only 7.1 per cent of the fruit affected with 

 the di-ease. while 32.9 per cent of the fruit was di-eased on Plot 2, 

 which had the same treatment, except that the second application 

 was made on April 11. a week after the petals fell, instead of on May 

 2. three weeks later. 



In the spraying demonstrations conducted in 1907 the disease was 

 as thoroughly controlled as in the previous year. At Gravette. in 

 the orchard of Mr. J. T. O-wald. a block of 125 very large Ben Davis 

 tree< was -prayed April 7. May 3. June G. July 6, and August 7. five 

 applications in all. Twenty trees were left unsprayed as checks. 

 The fruit from 9 average tree- of the sprayed block was sorted and 

 counted and 95.4 per cent found to be free from blotch, while a count 

 of 3 check trees showed only 34 per cent of the fruit free from the 



