110 Diseases of Greenhouse Crops 



Rust (Fuccinia aspargi D.C.) seems to be of no 

 importance as a disease of forced asparagus. 



Bean (Phaseolus Vulgaris^ 



Cultural Considerations, Beans are not to be 

 grown as a fall or winter crop. They are produced 

 more easily and more profitably as a spring crop. 

 In this case they follow well a winter crop of let- 

 tuce. The night temperature should not go below 

 60 degrees F. The best soil for bean culture is a 

 rich light sandy loam. The soil should never be al- 

 lowed to become damp and cold for any length of 

 time. It must not be allowed to become packed 

 and soggy through overwatering. As a safe guide 

 to success, the crop should never receive a check 

 in its growth in any period of its development. Of 

 the varieties adapted to forcing may be mentioned, 

 Black Valentine, Long Yellow Six Weeks, Ken- 

 tucky Wonder. 



Diseases of the Bean 



Forced beans may be attacked by several impor- 

 tant diseases. 



Blight 



Caused by Pseudomonas pJiaseoli Ew. Sm. 



Symptoms. If the soil is too wet during planting 

 time, the seed may rot in the ground and never ger- 

 minate. At other times the roots of the young seed- 



