Nov. 26, 19:1 



Transportation Rots of Stone Fruits 



475 



Figure 2 shows the comparative efficacy of spraying and dusting as 

 determined by the average of the four years' results on prunes. Little 

 contrast is shown between the two methods of treatment, both sulphur 

 dust and self-boiled lime-sulphur having reduced the amount of brown 

 rot at picking time from 4 per cent to approximately i per cent and 



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Fig. 2. — Comparative results from spraying and dusting in a four years' test on prunes. 



reduced the amount developed in shipments from 16 per cent to 2.5 

 per cent. 



It was pointed out earlier in the paper that the different spray appli- 

 cations were probably not of equal value in the control of brown rot on 

 the fruit. The great importance of the last application in this connec- 

 tion is shown graphically in figures 3 and 4. A reference to these figures 



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Fig. 3.— Brown-rot control of cherries as influenced by a late spray application (about three weeks before 

 picking time). The average results obtained from 15 different shipping tests. 



shows that with the prunes approximately one-half and with the cherries 

 approximately one-third the brown-rot control was due to this late 

 spraying. 



The comparative results obtained with the different rots in the various 

 shipping experiments are shown in figures 5 and 6. The term sprayed 



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Fig. 4. — Brown rot control of prunes as influenced by a late application of spray or dust (three to five 

 weeks before picking time). The average results obtained from 7 orchard experiments and 11 shipping 

 tests. 



as used in these two figures includes both dusting and spraying. 

 As has already been pointed out, there was no year in which there was a 

 serious epidemic of rot in the orchards under investigation. The amount 

 of rot on the untreated cherries at picking time never ran as high as i per 

 cent. The average amount of brown rot on the sprayed prunes at 



