260 Report of Farmers' Ii^stitutes 



PLANT DISEASES 

 F. C. Stewart and M, F. Barrus 



APPLE SCAB 



The past season has been exceptionally favorable for the de- 

 velopment of scab, and the disease as a result has been abundant. 

 It has been controlled in a satisfactory manner where applica- 

 tions of lime-sulphur solution or of sulphur dust have been made 

 during the summer. The late July application was very helpful 

 not only in keeping the fruit from becoming affected with scab 

 late in the season, but also in keeping it free from sooty blotch, 

 the name applied to a superficial blemish resembling scab, occur- 

 ring on the skin of the fruit, and caused by a fungus that develops 

 during moist weather. This disease has prevented many other- 

 wise good apples from classifying in grade A. 



powdered sulphur 



The applications with powdered sulphur have proved to be as 

 successful this year as in the past, and there seems to be no good 

 reason why the method should not continue to give as good con- 

 trol measures as the spraying method and at no greater expense. 

 It has the advantage of being more rapid and more convenient. 

 It has at the present time the disadvantage of being ineffectual as 

 a dormant application and as a measure to control aphis. While 

 there is no reason why these growers now completely equipped 

 with spraying machines should discard them for dusting 

 machines, there are growers now unable to cover their entire 

 orchard rapidly enough who could dust to advantage. . The dust- 

 ing method will also enable those having a small number of trees 

 to provide themselves at slight expense with means of controlling 

 fruit and foilage diseases and biting insects. 



PEACH LEAF CURL 



Recent experiments have clearly indicated that this disease, so 

 common during the past two years, can be as readily controlled 

 by fall applications of lime-sulphur solutions as by spring appli- 

 cations. In fact, the application can be made at any time after 



