CONTENTS 



Page. 



Introduction 7 



Symptoms of root-knot 7 



History of root-knot 8 



Plants affected by root-knot 10 



Plants not affected by root-knot 21 



Cross-inoculation experiments 22 



Distribution of root-knot 23 



The causal parasite 25 



Egg 26 



Larva 27 



Adult female 32 



Male 34 



Overwintering 36 



Comparison with Heterodera schachtii 36 



Methods of spread 37 



Effect on the host 39 



Conditions favoring root-knot 41 



Soil 41 



Moisture 42 



Temperature ." 42 



Control of root-knot 44 



Greenhouses, seed beds, etc 44 



Live steam 44 



Fresh soil 45 



Formaldehyde 46 



Miscellaneous 48 



Control of root-knot in the field on perennial crops 48 



Chemicals 49 



Carbon bisulphid 49 



Potassium sulphocarbonate 50 



Formaldehyde 50 



Calcium carbid 51 



Other chemicals 51 



Fertilizers 52 



Flooding 52 



Control of root-knot in the field when no crop is present 53 



Chemicals 53 



Carbon bisulphid 53 



Formaldehyde 53 



Calcium carbid 54 



Potassium sulphocarbonate 54 



Ammonium sulphate 54 



Fertilizers 56 



Flooding 58 



Drying 60 



217 



5 



