Treatments for Grape Diseases. 95 



of sulphates of copper and iron to destroy parasitic fungi on 

 vines and pear trees, also to kill red spider on almonds. . . . 

 The mixture I use consists of 2 pounds of sulphate of iron to 1 

 gallon of water, dissolved, and add 3 pounds of lime and 

 1 pound of sulphur, the lime being slaked in hot salt brine 

 to a consistency of thick whitewash." The removal of diseased 

 fruit, leaves, and canes is also recommended, in addition to the 

 liquid applications. 



The powdery mildew was best treated by the use of a mixture 

 recommended by J. F. Allen. 1 It is composed of sulphur and 

 lime, and is almost identical with Grison's liquid described on 

 page 16. 



Against black rot, it was advised to wash " the vines in early 

 spring, before the buds have commenced to swell, with a strong 

 solution of the sulphate of iron," but the main reliance was to 

 be placed in the bagging of the fruit. 



Anthracnose was to be controlled by the European practice of 

 " washing the vines in early spring, before the buds have com- 

 menced to expand, with a strong solution (50 per cent) of 

 sulphate of iron. . . . When the young shoots have attained 

 a length of five or six inches, they receive a good dusting with 

 the flowers of sulphur, whether the disease has appeared on 

 them or not." 



As regards the other two diseases mentioned in the bulletin, 

 no remedies were then known, but it was thought "probable 

 that the general treatment advocated for the downy mildew 

 and anthracnose will have a direct tendency to limit their 

 development." 



Three appendices form about two-thirds of this bulletin. 

 Appendix A, written by Erwiu F. Smith, gives an account of 

 the extent and severity of fungous disease on grapes, and some 

 of the more common methods of treatment. The material was 

 compiled from the answers received to a circular asking for 

 information on these topics. 



Appendix B was written by Colonel A. W. Pearson. It is 

 an article on "Remarks on Grape Rot and Grape Mildew," 

 which has already been quoted in these pages. 



Appendix C is entitled "The Prevention of Mildew Re- 

 sults of Experiments with Various Fungicides in French and 



* U. S. Patent Office Rept. Agric. 1854, 312. 



