Carnation Diseases 229 



and Bradt. These, therefore, should be handled 

 with more care. All diseased buds should be picked 

 off and destroyed by fire. The temperature and 

 moisture in the air should be kept as low as possi- 

 ble. The fact that the mite which is associated 

 with bud rot (fig. 48, k to m) is also found on 

 June grass would suggest the necessity of avoiding 

 sod where this grass is comxmon, in the making of 

 the compost. This, however, may not be important 

 when the soil is steam sterilized. 



Leaf Mold 



Caused by Heterosporium echinulatum Berk. 



Symptoms. The disease becomes apparent as 

 roundish spots, varying from a sixteenth to a sixth 

 of an inch in diameter, and is found mostly on the 

 tip of the leaves. In severe cases the entire leaf 

 and even the major tops of the plant become spotted 

 (fig. 47, c). According to Halsted* the color of 

 the spots is pale ashy and covered with a fine, dense 

 growth of the causal fungus, giving it the moldy ap- 

 pearance. Frequently the color changes to a gray 

 shade, sometimes approaching dark brown. 



Alternaria Leaf Spot 



Caused by Alternaria dianthi Stevens and Hall. 

 Symptoms, This trouble manifests itself as ashen 



*Halsted, B. D., New Jersey Agr. Expt Sta., Fourteenth Ann. 

 Kept.: 386, 1893. 



