VEGETABLE AND FIELD CEOPS 



287 



Blotches ' appear upon the leaves, first as small, moist, 



watery areas, associated with slight local wilting, followed 



soon by the appearance upon either side of tlie leaf of very 



small brown acervuli. The 



spots then change to gray and 



dry up. The disease spreads 



rapidly from plant to plant 



and is very destructive both 



under glass and in the open, 



rendering the plant unfit for 



use. 



White smut (Entyloma El- 

 lisii Halst.). — The attacked 

 plants are unmarketable, due 

 to lack of uniform green ('olor 

 and the presence of jKile 

 bleached spots upon the foli- 

 age. These spots are not 

 definitely limited, nor does 

 their tissue die as it does in 

 the case of other spinach leaf 

 spots. 



Black mold {Cladosporium 

 macrocarpum Preuss.) . — The 

 black mold develops especially 



upon old leaves, and renders the plant unsalable, fhe 

 spots are distinguishable from all other spinach spot dis- 

 eases by their irregularity, indefinitcness, and color. 



General. — To control all the above .spinach diseases, it 

 is well to burn disca.sed refuse, practice rotation, and 



' Halstcd, B. D., N.J. Agi. Kxp. St:i. Bill. 70, July, IS'JO. 



Fig. 12."i, — .Siiiii.ach leaf spotted by 

 hetcrosporiosc. After Reed. 



