CARTER: ILLINOIS TREES: THEIR DISEASES 



89 



Trees severely affected with anthracnose for several succes- 

 sive years may have many branches die. Such affected trees 

 should be given plant food to stimulate growth. One organic mer- 

 cury spray applied when the buds are swelling and the bud caps 

 begin to break (Fig. 89) will control anthracnose unless cool 

 weather prevails for a period of 2 or more weeks after the spray 

 is applied. During a long cool period, a second spray should be 

 applied 14 days after the first spraj'. Effective organic mercury 

 sprays include Puratized Agricultural Spraij and Coromerc 

 (Table 1). Similar fungicides are Phix and Tag 331, which 

 should be used at dosages recommended by the manufacturers. 



Fig. 88. — One type of sycamore anthracnose leaf injury appears as 

 small to large, irregular brown areas along the veins and midribs of mature 

 leaves. This type of injury seldom causes serious defoliation. 



