Columbia root-knot nematode on potatoes:

PREVENTION

• WASHING EQUIPMENT
• CERTIFIED PLANTING STOCK

DAMAGE THRESHOLDS (BASED ON FALL POPULATION LEVELS)
CROP ROTATION

• ALFALFA
• BARLEY
• WHEAT
• ONIONS
• FALLOW
• POTATO VARIETIES

HARVEST DATES DETERMINED BY ACCUMULATED DEGREE DAYS
CHEMICAL CONTROL ONLY IN FIELDS WITH LOW POPULATIONS
ECONOMIC EVALUATION OF ALTERNATIVES
LONG RANGE COMPUTER ASSISTED PLANNING (3-5 YEARS)

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