Root-knot Nematode or Gallworm 



Shortly after the larvae hatch they escape from the root of the host 

 plant and spend a time in the soil. Soon they search out the root of a 

 suitable plant and burrow into it, where they feed upon its sap, causing 

 the characteristic swellings already mentioned. 



The nematode gallworm lives from season to season embedded in 

 the tissue of the host plant either in the egg or larval stage. The life of 

 the adult is only a few weeks under favorable conditions. 



Plants and crops subject to severe infestation which should never 

 be planted on infested land:* 



Plants subject to attack but not seriously injured by nematode 

 gallworms: These should not be planted on infested land as they will 

 serve to keep the worms alive.* 



Alfalfa 

 Vetch 



Sweet clover 

 Asparagus 

 Cabbage 



Cauliflower 

 Garden pea 

 Horseradish 

 Strawberry 

 Lima bean 



Kale 

 Onion 

 Radish 

 Spinach 

 Sweet potato 



Crops suited for planting on infested land :* 



Bailey Corn Kafir 



Oats Sorghum Timothy 



Wheat Milo Red top 

 Rye 



*C. S. Scofield. "The Nematode Gallworm on Potatoes and Other Crop Plants in Nevada," Circular 

 No. 91, Bureau of Plant Industry. U. S. Department of Agriculture (1912). 



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