IHE GPtAPE ANTHRACNOSE 87 



:spores is shown in process of germination, one of the 

 germ tubes haying ah-eady formed a sucker on its side. 

 The winter spore case, with the inner cases escaping 

 til rough its ruptured side, is well shown in a. 



Treatment. — This disease may easily be prevented. 

 According to Mr. Galloway, ^^it succumbs readily to 

 sulphur, either in the form of flowers of sulphur, or 

 solutions of the sulphide. In applying the sulphur, bel- 

 lows should be used, and the first applications should 

 be made ten or twelve days before the flowers open, the 

 second when in full bloom, and a third three weeks or a 

 month later if the disease seems to be on the increase. 

 The best results are obtained with the thermometer 

 ranging from 80° to 100° F. In this temperature fumes 

 are given off which quickly destroy the fungus. We 

 have obtained excellent results in treating this disease 

 with a solution made by dissolving half an ounce of 

 potassium sulphide to the gallon of water. This prepa- 

 ration is cheap, and can be quickly and effectually ap- 

 plied with any of the well-known spraying pumps. The 

 greatest care should be exercised in making the second 

 spraying, which, by the way, should be at the same 

 time as that mentioned for the flowers of sulphur, in 

 order to protect the blossoms from the fungus." 



Literature. — An excellent account of this fungus, 

 from the pen of Professor Scribner, may be found in the 

 Report of the United States Department of Agriculture 

 for 1886 (pp. 105-109). There are many shorter arti- 

 cles concerning it scattered through our horticultural 

 literature. 



The Grape Anthracnose 



Sphaceloma ampelinurri 



The peculiar and characteristic injury produced 

 l)y the fungus of anthracnose easily distinguishes it 

 from the other diseases of the vine. It attacks all the 



