22 



RESULTS OF TREATMENT. 



The treatment for apple scab has been known for a numl?er of 

 years. It was worked out fully by the Bureau of Plant Industry in 

 1891-1893 in experiments carried on in the State of New York. 

 Certain progressive apple growers have known that thorough applica- 

 tions of Bordeaux mixture just before the trees bloom, and again as 

 soon as the petals have fallen, will largely prevent tliis disease. 



The scab was not serious in the Ozark region during the past season, 

 and unsprayed trees showed but slight infections. On tliis account 

 the results from spraying in the demonstration orchards are not 

 considered of sufficient importance to present here. It may be wortli 

 while, however, to give some results in controlling scab obtained in 

 the orchard of the Morton estate at Nebraska City, Nebr., in connection 

 with a spraying experiment conducted by the Department of Agricul- 

 ture during the past season, devoted to codling moth as well as scab. 



There were 13 different plots of 6 trees each and 12 checks, but 

 only plots 1 and 2 and the checks will be here considered, as these 

 other plots were devoted primarily to tlie codling moth or were 

 planned to show the danger of omitting treatment at critical periods. 

 Plot 1 was sprayed first when the cluster buds were open, shortly 

 before blooming (Aj^ril 25), and again as soon as the petals had 

 fallen (May 11). Plot 2 had the same applications and a third spray- 

 ing on May 17. The 5-5-50 formula of Bordeaux mixture was used 

 for the first application, and the 4-6-50 formula with 2 pounds of arse- 

 nate of lead for the succeeding applications. The results from 3 trees 

 of each sprayed plot and 3 untreated trees are given in Table 6 : 



Table G.- — Comparison of sound and scabby fruit from sprayed and ■unsprayed irincsap 

 trees, Morton orcftani, Nebraska City, Xebr., 1906. Fruit picked Oct. 20. 



a Sprayed April 25, when cluster buds opened; May 11, as petals fell. 



b Spriiyi'd -Vpril 25, when cluster buds opened; May 11, as petals fell; May 17, six days after petals fell. 



<" Unsprayed. 



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