344 Diseases of Truck Crops 



may be found wherever Irish potatoes are known to 

 suffer from late blight, since the tomato and potato 

 blight are caused by the same fungus. 



Symptoms. Affected plants appear as though 

 killed by frost. The disease first shows itself as small 

 blackened areas on the leaves (fig. 64 d), stems, and 

 fruits. These rapidly increase in size and cause pre- 

 mature death of the affected host. Fruits which may 

 not show signs of disease will develop the trouble in 

 transit if coming from infected fields. For a de- 

 scription of the causative fungus, see late blight of 

 potato, p. 322. Late blight of tomatoes may be con- 

 trolled by spraying. The best results are obtained 

 by using 5-5-50 Bordeaux. Spraying should begin 

 with the rainy season. The ripe fruit should be 

 cleaned by wiping off the Bordeaux stains with a 

 dry cloth. 



BUCKEYE ROT 

 Caused by Phytophthora terrestria Sherb. 



Buckeye rot is a disease which attacks the fruit. 

 The trouble seems to be new and has been recently 

 described by Sherbakoff. 1 So far as is known the 

 disease has appeared only in Florida. 



Symptoms. The disease, as the name indicates, 

 appears as a pale to dark greenish-brown zonate spots 

 on the fruit (fig. 64 i) . The rot is hard and somewhat 

 dry when the fruit is green, but becomes softer as the 



1 Sherbakoff, C. D., Phytopath. 7 : 119-129, 1917. 



