Pecan Diseases, and Spraying Out -fits 191 



outlines and assume a lighter reddish-brown color with a 

 darker brown border. When the spots reach about a half 

 inch in diameter, the leaves drop. From five to six weeks 

 after the spots form, club-shaped spores of the fungus are 

 produced, usually on the upper surface. The disease is spread 

 by these spores w^hich are carried by the ^^dnd to other leaves 

 which become infected in turn so that new spots form. 



Control, 



The pecan bro^Ti leaf-spot rarely reaches such severity 

 as to necessitate spraying. However, the disease may 

 be controlled by carrying out the same spray schedule with 

 bordeaux mixture as is recommended for pecan nursery blight. 



POWDERY-MILDEW 



{Microsphoera alni, Salm.) 



Powdery-mildew occurs rather generally throughout the 

 pecan belt. It makes its appearance in the early part of the 

 summer and is very noticable during rainy and humid periods. 

 The fungus frequently covers the leaves and nuts with a 

 white powdery growth, causing only slight damage. 



Spraying Avith bordeaux mixture, as recommended for nurs- 

 ery blight, will control this disease. 



ANTHRACNOSE 



{Glomerella cingiilata, S. V. Von S.) 

 Anthraenose is well distributed throughout most localities 

 in which the pecan is grown commercially. Attacks have been 

 light and the industry has not suffered any serious effects 

 from the disease. 



