Guide

Yellow Sticky Boards in Crop Protection

How coloured glue boards trap flying pests, where to hang them, and what they tell a grower.

Coloured glue boards are the cheapest pest-control technology a grower can deploy, and the only one that also reports back. Kunda's own growing note puts the reduction from yellow-board trapping at around 40% of the insect pressure on a treated crop.

Why yellow

Many flying crop pests are drawn to a specific band of yellow. The board reflects that wavelength, the insect flies to it, and the adhesive holds it. There is no active ingredient, no residue and no re-entry interval — which is why the technique sits comfortably inside pollution-free and low-residue growing programmes.

Where it is used

Vegetables, fruit trees and tea are the three crops Kunda's note names. In vegetables, boards hang through the whole growth cycle and take aphids, whitefly and leaf miners. In orchards, boards go up through the flight period of the target pest.

Boards or rolls

Single boards suit monitoring and small blocks. Continuous glue rolls suit long greenhouse runs, where replacing individual boards becomes the job itself. Both come in yellow and blue — blue is the thrips colour.

Getting the placement right

• Hang at crop canopy height and raise the boards as the crop grows
• Start before the pest arrives; the first catches are the early warning
• Replace when the surface is covered — a full board catches nothing
• Count catches per board per week; that number, not the calendar, decides the next intervention

What it does not replace

Mass trapping suppresses adults. It does not treat an established larval infestation, and it is not a substitute for crop hygiene. Used as monitoring, though, it tells a grower when a spray is actually warranted — which is where most of the saving comes from.

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