Causes of Diseases in Crops 91 



ful sifting, the dodder seed may be separated out from 

 the others. Infested areas should be burned over so 

 that the dodder would be prevented from spreading 

 and producing seed. In case of large infested spots in 

 the field it may be necessary to use drastic measures. 

 Each trucker, of course, could best decide for himself 

 the cheapest and speediest way of eradicating the pest. 



