40 Diseases of Truck Crops 



acting as a surface mulch, and indirectly preventing 

 evaporation. They may also stimulate young plants 

 to more rapid growth, enabling them to withstand 

 the action of alkali. Young plants are much more 

 sensitive to alkali than older ones. The older plants 

 of cantaloupes, for instance, are far more resistant to 

 alkali than the young seedlings. 



