TREES AND TIMIlEIt 441 



indicate the presence of this disease. It has been reported 

 as destructive in Massachusetts, New Jersey, and New 

 York. Two sprayings in Massachusetts resulted in longer 

 retention of the foliage and lessened infection. It was 

 estimated that two sprayings will give a gain of from 2 to 5 

 per cent in growth and development. 



LOCUST 



Heart rot (Fomes rimosus Berk.). — From Massachusetts 

 to New Mexico, over the entire black locust territory, 

 this heart rot prevails. It is a yellow rot extending from 

 the center outward in radial hnes through the medullary 

 rays; the hard flinty wood is reduced to a soft yellow cheesy 

 mass, spongy when wet. The pore-bearing, shelving, hoof- 

 shaped sporophores develop chiefly from the burrows of 

 the locust borers or from stubs. The young portions are 

 light brown; older parts, dark to black and fissured. The 

 lower side is dull red-brown. 

 'The rot ceases with the death of the tree, and posts made 

 from diseased wood do not continue to rot- 



LOCUST, HONEY 



Leaf spot (Leptostroma hypophylla B. & Rav.). — The 

 leaflets become covered with small black specks; some 

 turn yellow and fall. 



MAGNOLIA 



Colletotrichose (Colletotrichum sp.). — Circular dead spots 

 are produced upon the leaves and upon the young branches, 

 killing the foliage and twigs. 



