Aphid Infestation Score Calculator

Calculate the economic injury level (EIL) and economic threshold (ET) to determine when pest control treatment is cost-justified.

Control cost ($/acre)

Crop value ($/unit yield)

Injury per pest (yield units)

Damage coefficient (0-1)

Treatment efficacy (0-1)

Current pest density (per sample)

Tab to move between fields

Economic Injury Level (pests/sample)

3,529.41

Economic Threshold (pests/sample)

2,647.06

Current density as % of EIL0.57

Treatment recommended (0/1)0

Current yield loss value ($/acre)$0.1

Net benefit of treatment ($/acre)-$14.91

Value Saved At EIL15

How to Use This Calculator

Enter Control cost ($/acre), Crop value ($/unit yield), and Injury per pest (yield units).
Set Damage coefficient (0-1), Treatment efficacy (0-1), and Current pest density (per sample).
Review Economic Injury Level (pests/sample) and Economic Threshold (pests/sample).
Use Current density as % of EIL and Treatment recommended (0/1) to inform your decision.

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