PEACH DISEASES 297 



beneath the lesion, suggesting an attempt on the part of the 

 affected cells to repair the injury. Some time during the grow- 

 ing season the fungus infects the twigs, developing lesions as 

 previously described. In these diseased areas the pathogene 

 passes the winter. 



Control of peach-scab. 



In the early history of the disease, peach-scab was less amen- 

 able to treatment than it now is, because of severe injury of 

 fungicides to the foliage. With the development of self-boiled 

 lime-sulfur it has become possible to control scab without 

 injury to the fruit or foliage. Where scab alone is to be treated, 

 use self-boiled lime-sulfur 8-8-50 as follows: (1) four to five 

 weeks after the petals drop ; (2) about three to four weeks 

 later. The second application is usually unnecessary if the 

 first is thorough. Use about one-half to one gallon on trees 

 three to four years old, depending upon the type of nozzle. 

 The cost of one application on four-year-old trees has been esti- 

 mated at four cents a tree. Spraying as directed above has 

 been known to give from 92i to 99 per cent of the crop free from 

 scab. 



Most peach-orchards in eastern United States should be 

 given treatment for brown-rot as well as for scab. It should 

 be remembered that preventing scab is an important step in 

 the control of brown-rot. 



REFERENCES 



Whitmarsh, R. D. Black spot or scab (Cladosporium carpophyllum 



Thiim.). Massachusetts Agr. Exp. Sta. Rept. 23:165-167. 



1911. 

 Sturgis, W. C. Scab and mold of peaches. Connecticut Agr. Exp. 



Sta. Rept. 18 : 138-139. 1895. 

 Sturgis, W. C. On the probable winter-condition of the fungus of 



peach-scab. Connecticut Agr. Exp. Sta. Rept. 20 : 269-271. 



1897. 

 Chester, F. D. The spotting of peaches. Delaware Agr. Exp. Sta. 



Rept. 8 : 60-63. 1896. 



