UNITED STATES 

 DEPARTMENT OF AGRICULTURE 



MISCELLANEOUS PUBLICATION NO. 408 



Washington, D. C. j une 1941 



Plants Reported Resistant or Tolerant to 

 Root Knot Nematode Infestation 



By Jocelyn Tyler, junior nematologist, Division of Nematology, Bvreau of 



Plant Industry 1 



CONTENTS 



Page 



Scope of the compilation 1 



Preliminary discussion of the problems 



involved in studying resistance 2 



Definitions 3 



Basis for selection of material 4 



Possible standardization of tests and re- 

 ports 6 



Arrangement 7 



Generalized reports by plant groups 8 



Page 

 Plant species and varieties reported resistant or 



tolerant n 



Summary 77 



Plants usually recommended to growers 



as resistant to root knot 77 



Plants recommended only with reser- 

 vations 78 



Literature cited 78 



SCOPE OF THE COMPILATION 



This publication is a compilation of reports on all plant species 

 and varieties that have been called either resistant or tolerant to in- 

 festation by the root knot nematode, Heterodera marioni (Cornu) 

 Goodey (formerly called H. radicicola (GreefT) Muller) . The purpose 

 is twofold: To bring together all available information on the subject 

 in condensed form for the use of growers, plant breeders, and other 

 investigators, and to establish a basis for the contribution of further 

 data. It must not be assumed that all of the plants here listed are 

 recommended as resistant. The intention is rather to present tech- 

 nical source material, not only useful to those who need practical 

 information on particular plants but also suggestive to future workers. 

 The literature on this subject contains many contradictions. Some 

 of the reports are hasty in observation or careless in definition and 

 others are incomplete, but they are all included impartially, together 

 with the more reliable and helpful information that is available. 



1 Grateful acknowledgment is made to staff members of the Division of Plant Exploration and Intro- 

 duction, Bureau of Plant Industry, for checking the entire list of plant names for botanical accuracy. Val- 

 uable assistance with the classification of cultural varieties has been received from crop specialists of the 

 Divisions of Cereal Crops and Diseases, Cotton and Other Fiber Crops and Diseases, Forage Crops and 

 Diseases, Fruit and Vegetable Crops and Diseases, and Tobacco and Plant Nutrition. 



L. H. Day and W. W. Mackie, of the California Agricultural Experiment Station, C J. King, of the Divi- 

 sion of Cotton and Other Fiber Crops and Diseases, and members of the Division of Fruit and Vegetable 

 Crops and Diseases, Bureau of Plant Industry, have cooperated by supplying information on their latest 

 results and by permitting the use of their data. The Nematode Committee of the California Agricultural 

 Experiment Station has permitted the use of certain citations from its unpublished correspondence. 



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