50 Diseases of Greenhouse Crops 



Table 6 



old, well manured soil in the greenhouse. This 

 does not imply, therefore, that it is necessary to 

 renew the soil every year for cucumbers or toma- 

 toes. Soil sterilization, good drainage, and liming 

 will tend to overcome the ill effect of old soils on 

 these crops. 



