236 DISEASES OF ECONOMIC PLANTS 



3-6-50. For subsequent sprayings use 4-4-50 Bordeaux 

 at intervals of about ten days if the weather is dry; 

 oftener, if growth is rapid. 



The cost of six apphcations is placed at 15.22 per acre, 

 including labor. The net profits from this have been as 

 high as $163.50 per acre. 



EGG PLANT 



Wilt, bacUlose {Bacillus solanacearum E. F. Smith). — 

 This disease is closely like the wilt described for the 

 tobacco, and the remarks made in that connection con- 

 cerning cause, spread, and treatment apply to this crop 

 plant as well. 



Wilt, nectriose (Nectria Ipomceoe Halst.). — Unlike so 

 many diseases there is no leaf or fruit spot whatever, 

 though whole fields have been so badly attacked that 

 scarcely a fruit was gathered. The affected plants when 

 half grown take on a yellowish, sickly appearance, the 

 foliage wilts, the lower part of the stem becomes coated 

 with a whitish mold, and the plant usually dies. Nu- 

 merous small pink perithecia are found upon the stem just 

 below, or at the surface of the ground. 



This disease is close kin to the wilt of cotton, and most 

 that is said there regarding treatment applies here. 



Damping off (Pythium DeBaryanum Hesse, and Phoma 

 Solani Halst.). See p. 61. 



Leaf spot, phyllostictose (Phyllostida hortorum Speg.). — 

 Plants in the hotbed are subject to leaf-spot attack, 

 the transplants dying, or it may appear later upon leaves 

 and fruit and result only in more or less serious leaf spots. 



Upon the leaf large irregular brown or gray patches are 



