South Africa has banned terbufos, and Grain SA has responded with guidance on responsible crop protection for grain producers who now must work without one of the country's most widely used soil-applied insecticides.

The ban removes a granular organophosphate that maize growers have relied on for decades to control soil insects such as cutworm, false wireworm and diabrotica larvae in the seedbed. For many dryland maize operations, terbufos sat at the centre of an in-furrow programme that cost relatively little per hectare and delivered broad-spectrum control at planting.

Grain SA's message to farmers is direct: the answer is not to chase a single replacement product, but to rebuild an integrated approach to soil pest management. That shift has practical consequences for seed orders, planter settings and spray schedules for the coming season.

What does the ban change at planting time?

The first change lands in the seed catalogue. Treated seed carrying registered insecticide dressings becomes the primary line of defence against early-season soil pests. Growers who previously ran untreated or lightly treated seed alongside a terbufos granule now need to confirm seed treatment options with their suppliers well before delivery dates tighten ahead of plant.

The second change lands in the planter. Granular applicator setups configured for terbufos either come out of the machine or switch to whichever alternative actives remain registered for in-furrow use in South Africa. Farmers should verify current registrations rather than assume that older product labels still apply, because the withdrawal of one active ingredient often triggers a wider tidy-up of related registrations.

The third change lands in the scouting calendar. Without a broad-spectrum soil treatment at plant, the cost of missing a pest build-up rises. Grain SA's guidance places greater weight on field inspection before planting, on knowing field history for soil pest pressure, and on acting on thresholds rather than applying preventively.

Why the regulatory decision matters beyond terbufos

Terbufos is an organophosphate, a chemistry class under tightening restriction worldwide because of acute toxicity risks to human health and the environment. South Africa's decision follows the same regulatory logic that has already removed or restricted several older organophosphates in other grain-producing countries.

For farmers, the signal is clear. Crop protection portfolios built on single, older broad-spectrum actives carry regulatory risk. Diversifying control methods now costs less than being forced to diversify later, mid-season, with limited product availability.

What should farmers do before the next planting window?

Grain SA sets out a practical sequence:

• Audit which soil insecticides remain registered for the crops you plant, and confirm availability with suppliers before committing to a programme.
• Order insecticide-treated seed early, because demand for dressed seed typically rises sharply when a soil granule exits the market.
• Use field history and pre-plant scouting to identify which paddocks genuinely carry soil pest risk, and target spending there rather than across every hectare.
• Consider cultural controls, including planting date adjustments and residue management, as part of the pest pressure equation.
• Keep records of pest pressure and product performance, so future programme decisions rest on field data rather than habit.

What to watch next

The immediate items to track are the product registration lists published by the regulatory authorities, seed treatment availability from your seed supplier for the coming season, and any further Grain SA advisories on substitute chemistry. Growers who lock in treated seed and a registered alternative programme early will enter the next planting window with options. Those who wait risk finding the shelf empty at plant.

By Tom Whitfield, Arable Wire