28o Diseases of Truck Crops 



Where this is not the case it soon becomes subject to 

 a few, but serious, diseases. 



Leopard Spot 



Cause, Unknown. 



The disease, as the name indicates, consists of large 

 irregular ashen colored spots, each surrounded by a 

 dark border. No treatment which keeps the disease 

 in check is known. 



Rust 



Caused by Puccinia asparagi D. C, 



Asparagus rust does not seem to be limited in its 

 geographic distribution, as it has been found in all 

 States where the crop is grown. It is especially se- 

 rious in California, New Jersey, and all the other im- 

 portant asparagus regions. 



Symptoms. Rust does not attack the asparagus 

 tips which are cut for the market. It attacks the 

 green tops which develop after cutting has ceased. 

 Affected tops redden, and these when carefully ex- 

 amined will reveal reddish rusty pimples or sori on 

 the stems (fig. 52 a) and needles. In severe infection, 

 the reddened tops become bright yellow, the needles 

 fall oS prematurely, exposing a bare dead stalk cov- 

 ered with numerous rust sori. The symptom is 

 generally found in September and the pimples are 



