Maize Doctor

Patterns of field damage

General - over entire field	Possible cause	Probability (Entire field)
	Insects	Rare
	Nutrition	Possible e.g., general deficiency
	Management	Possible e.g., application skip
	Environment	Possible e.g., Heat
	Water	Possible e.g., Stress
	Disease	Unlikely
	Pests	Rare

Along field edge	Possible cause	Probability (Along field edge)
	Insects	Unlikely
	Nutrition	Possible e.g., deficient field
	Management	Possible e.g., application skip
	Environment	Unlikely
	Water	Unlikely
	Disease	Unlikely
	Pests	Possible e.g., bird damage

Random Across Field	Possible cause	Probability (Random plants)
	Insects	Possible
	Nutrition	Unlikely
	Management	Possible e.g., mixed seed
	Environment	Unlikely
	Water	Unlikely
	Disease	Possible
	Pests	Possible e.g., bird damage

Scattered Clusters	Possible cause	Probability (Scattered clusters)
	Insects	Common
	Nutrition	Common e.g., N deficiency
	Management	Common e.g., N misapplication
	Environment	Rare
	Water	Possible
	Disease	Possible
	Pests	Possible e.g., bird damage

Strips Across Field	Possible cause	Probability (Strips across field)
	Insects	No
	Nutrition	Possible e.g., N strip applied
	Management	Possible e.g., line application
	Environment	Unlikely
	Water	Unlikely
	Disease	No
	Pests	Unlikely