144 PEACH LEAF CURL: ITS NATURE AND TREATMENT. 



NOTES ON THE AUXILIARY EXPERIMENTS IN NEW YORK, INDIANA, AND 



OTHER PEACH-GROWING STATES. 



Much experimental work for the control of leaf curl has been under- 

 taken at the suggestion of the Department by the peach growers of 

 New York, Indiana, Illinois, Ohio, Kentucky, Mar3'land, Pennsj'lva- 

 nia, Georgia, Tennessee, North Carolina, Arkansas, IMissouri, Kansas, 

 and other peach -growing States not already considered in this bulletin. 

 For instance, 80 prominent peach growers of various peach-growing 

 centers of New York were giyen full instructions for the control of 

 curl in the winters of 1893-94 and 1891r-95, and requested to report their 

 work, which in a number of instances was carefully done. The same 

 is true of 54 growers in Ohio, 135 in Pennsylyania, etc., and in each 

 case where the work was properly conducted the results were in har- 

 mony with those already discussed in this chapter. For this reason, 

 as well as from the fact that the work already considered has been 

 selected from those sections of the country which are fully represen- 

 tative of the different climatic conditions, it is not thought necessary 

 or desirable to enter much further into the details of the work. One 

 or two experiments may be mentioned, however, before closing the 

 consideration of this phase of the subject. 



Mr. Joseph M. Cravens, of Madison, Ind., reported almost absolute 

 success in the control of curl in his orchard. The spra3"ed trees of 

 the 4 experiments made in no case showed more than 3 per cent of 

 curled leaves, while the amount of curl on the foliage of the unsprayed 

 trees ranged from 25 to 45 per cent. Mr. Cravens states in a letter 

 accompanying his report that he sprayed separate rows through his 

 orchard which were sufficiently far apart not to have the spray affect 

 the intervening rows even if the wind blew at the time of application, 

 and further that he is satisfied that two of the spraj^s used would have 

 given absolute results had they been applied to every portion of every 

 twig. 



Mr. W. T. Mann, of Barkers, N. Y., sprayed 25 trees with the lime, 

 sulphur, and salt spray April 9, 1894, and left 25 trees at their side 

 without spraying for comparsion. On jSIay 28 only 42 diseased leaves 

 were found on the 25 sprayed trees, while as high as 40 per cent of 

 curled foliage was present on some of the unsprayed trees. On the 

 same date as the other spraying was done 25 trees were spraj^ed with 

 Bordeaux mixture, while 21 were left for comparison. By May 28 

 only 59 curled leaves had developed on the entire 25 sprayed trees, 

 while of the 21 unsprayed trees several had as high as 30 to 35 per cent 

 of curled leaves. jSIr. Mann says that from the fact that among the 

 50 trees treated not one showed an appreciable amount of disease, 

 while all throuefh the orchard trees were badlv affected, was to him 

 very satisfactory evidence of the value of the treatment, especially as 



