111. PLUM LEAF SrOT. 



S. A. BEACH. 



POPULAR ACCOUNT OF AN EFFORT TO CONTROL PLUM 



LEAF-SPOT. 



May be controlled by spraying with Bordeaux Mixture. — Plan of in- 

 vestigations of 1895-6.— Course of treatment recommended. — Black knot 

 and fruit rot clieckcd somewhat by tliis treatment. 



The leaves of plum trees are liable to injury from what is 

 commonly known as the ^' leaf spot " or " shot hole " disease. 

 It will be explained more fully later that this disease is caused 

 by a fungus* which attacks all kinds of cultivated plums, in- 

 eluding native and Japanese sorts, and also cherries and some 

 other kinds of stone fruits. In years past it has caused con- 

 siderable injury and sometimes serious loss in the plum and 

 cherry orchards of this state. The disease as it appears on 

 cherry leaves is Illustrated in plate XXIX. 



Investigations which have been made at experiment stations 

 within recent years have shown that it may be i)revented by 

 thoi'ough spraying with Bordeaux mixture,f and the results of 

 iliese experimenls are abundantly confirmed by the practical 

 experience of many fruit growers. 



Plan of Experiments in 1895. 



In recent years, in one of the extensive plum orchards of T. 

 0. Maxwell & Bros., of Geneva, eau celeste soap mixture has 

 been used with very good results for checking the spread of the 



* Cylindroitporium Padi, Karsteii. 



t Thaxter, Rowland. Kf-p. Coun. Sta. 1889: 170, 1890 : 102. 



Cireen, W. J. The Shotliolc FniiKiis of the Pliiui Bull. Ohio Kxp. Sta 1891. II, 4 : 2I<;. 



Kairchild, 1>. <".. riiiiii Leaf Hlijlht. Bull. U. S. Div. Vcjr. Path. 1894, 0: 39-40. Join. M.\c 

 7: •J.'>3 256 111. 2., liep. N. Y. State Kxi>, Sta. 189'J, 11: 6.')9 (id:}. Treatiiieiit of Plum Leaf Blinht 

 in Nm-seiy. Bull. TJ. S. Div. Veg. Path. 1892, :i : 63-64. 



Beach, S. A. PreTenting Leaf Blight of Plum and (Jherry Nursery Stock. Kep. N. Y. 

 State Exp. Sta. 1893: 688 693. Bull. N. Y. State Rxp. Sta. 72. 



