CULTURAL PRACTICES:

INTRODUCTION
CROP ROTATION

• RATE OF POPULATION INCREASE
  
• RATE OF POPULATION DECLINE
  
• DAMAGE THRESHOLDS
  
  • TEMPERATURE DEPENDENCE
• "RESISTANT" VARIETIES
  
  • EXAMPLES
    
  • COTTON FOLLOWING RESISTANT TOMATOES
    
  • BEANS FOLLOWING RESISTANT TOMATOES
    
  • HOST-NEMATODE RESPONSES ON WALNUT ROOTSTOCKS
    
  • HOST-NEMATODE RESPONSES ON FRUIT TREE ROOTSTOCKS
    
  • HOST-NEMATODE RESPONSES ON GRAPE ROOTSTOCKS
    
• SELECTION OF TOLERANT VARIETIES
  
• DEVELOPMENT OF ALTERNATE ROTATION CROPS
  
• AN EXAMPLE - YOLO COUNTY, CALIFORNIA
  
  • TYPICAL CROPS & GROWING SEASONS
    
  • TYPICAL NEMATODES
    
  • HOST RANGE
    
• A HOME GARDEN ROTATION SCHEME
  

COVER CROPS

• BENEFICIAL EFFECTS OF GROWING COVER CROPS
  

FALLOWING

• GERALD THORNE, PRINCIPLES OF NEMATOLOGY, 1961
  

WEED CONTROL
DATE OF PLANTING
DATE OF HARVEST

• EXAMPLE - DETERMINING NEMATODE DEGREE DAYS
  

FLOODING
TRAP CROPS
REMOVING PLANTS WITH SYMPTOMS
MODELS
ECONOMIC EVALUATION OF ALTERNATIVES
AN EXAMPLE - MANAGEMENT OF SUGARBEET CYST NEMATODE

• THE PLAN - RASKI & ALLEN, 1948
  
• PROTECTION OF UNINFESTED LAND
  
• CLEAN CULTIVATION OF HOST WEEDS
  
• CROP ROTATION
  
  • POPULATION DECLINE
    
  • DAMAGE THRESHOLDS
    
  • POPULATION INCREASES
    
  • DEGREE DAYS
    
  • COVER CROPS
    
• EARLY PLANTING
  

USEFUL LINKS:

• Weather, Models, and Degree Days
• Background Information on Degree Days
• Phenology Models
• About the databases

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