Field Diagnostics

Something is wrong in the field. Where the problem sits, and what the affected plants look like, narrow down what is causing it. For annual crops.

Pattern first, plant second. The shape of the problem across the field usually tells you more than the first damaged plant you pick up. This tool expands the Pattern and Compare steps of .

Step 1

Assess the region

Before looking at this field, look around it. Surrounding fields and natural vegetation give you a sense of the general soil fertility and rainfall, and tell you whether the problem is yours alone or shared by the whole area. A problem in every field around usually means weather, season or a widespread pest — not this farmer's management.

Step 2

Assess the field — where is the problem?

Walk a “W” or “X” across the field and note where the crop is damaged, discoloured or unevenly tall. Choose the pattern that fits best.

Pattern of the problem across the field

Step 3

Look at the affected plants

Pull up a few affected plants and a few good ones and compare them side by side — leaves, stems, roots and the soil around them. Tick what you see. Leave it blank if you have not looked yet.

What could it be? Start again

What could it be?

Print / save Change answers

A guide to narrowing down possibilities, not a diagnosis. Confirm in the field, and get local expert advice before spending money on a treatment.

Developed by Mark Bell (2026) (c)
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