12-1 



BISEAtiES OF ECONOMIC PLANTS 



Results of Experiments for the Control of the Peach 

 Brown Rot, Marshallville, Ga., 1908 



The treatment recommended by Scott for brown rot and 

 scab based upon these results is as follows: For the com- 

 bined treatment of peach scab and brown rot, at least three 

 applications of the self-boiled lime-sulphur wash are 

 necessary, " the first, three to four weeks after the petals 

 drop, the last about a month before the fruit ripens, and the 

 second midway between. Scab infection begins four to 

 six weeks after the trees bloom, and in order to 

 control this disease the first treatment must be made not 

 later than a month after the petals drop. The time of the 

 last application must be determined by the ripening date of 

 the variety. To avoid staining the fruit the last spraying 

 should be made a month before the fruit ripens, though a 

 later treatment would be more effective against the brown 

 rot. Three applications distributed in this manner are 

 sufficient for the Elberta and earlier varieties. A fourth 

 treatment will doubtless often be desirable for later matur- 

 ing varieties. 



" There seems to be no question as to the advisability of 



