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 :* 



Beet Pumpkin Cowpea 



Carrot Potato Rape 



Celery Salsify Soy bean 



Cucumber Squash Cat'alpa 



Egg plant Tomato Cherry 



Lettuce Watermelon Elm 



Muskmelon Clover Peach 



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 Cauliflower Kale 



Vetch Garden pea Onion 



Sweet clover Horseradish Radish 



Asparagus Strawberry Spinach 



Cabbage Lima bean Sweet potato 



Crops suited for planting on infested land :* 



Barley Corn Kafir 



Oats Sorghum Timothy 



Wheat Milo Red top 

 Rye 



*Q 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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