318 PLANT DISEASES 



favoured by the dispersion of the dropped-out portions of 

 the leaf bearing conidia. 



PREVENTIVE MEANS. Spray with ammoniacal solution 

 of copper carbonate, the first time just when the leaves 



Fig. 86. Cercospora circumscissa. i, peach leaf diseased ; 2, cluster 

 of conidiophores bearing conidia, X4oo. 



are expanding, and repeating at intervals. Bordeaux mix- 

 ture should not be used for peach or almond, as the leaves, 

 and even young shoots, are injured by dilute solutions. 



Pierce and Galloway, Journ. Mycol., vol. vii. p. 66, 4 pi 

 (1894). 



