Arable Update – Is your Grain Store ready for Harvest?

Mites – the most common pest of stored cereals and rape seed – can be controlled by treating store fabric.

Reldan® 22 is a broad-spectrum insecticide for control of insects and mites that infest grain and grain stores and is used as a fabric treatment.

Poor store hygiene can lead to mite and pest attacks of stored grain, which spoil quality  and can lead to 5% – 10% losses, which can have an effect on overall farm profits, or worst case scenario, can lead to complete crop rejection.  “With control measures starting up to one month before harvest, now is the time to plan what action to take and apply Reldan 22. It is the only grain store product that controls mites.  Preventative action is needed before the combines start to roll,” says Peter Waite of Dow AgroSciences.

Reldan works by contact, ingestion and fumigant action to achieve fast knockdown and long-term control. It can be used for pre-harvest hygiene of grain stores, as well as on stored grain. In the UK, up to 10% of grain yield can be lost to mite and other insect pest damage after harvest. Damage to stored crops includes loss in weight, reduced nutritional value, and lower value due to tainting and insect fragments.

“Reldan 22 is the only grain store product that controls mites”

To help prevent these losses, grain stores should be thoroughly cleaned out and treated with Reldan 22 acaricide and insecticide before harvest. When applied to grain stores as a fabric treatment, there is no withholding period for any grains subsequently stored in those premises.

Flexible applications

  • Can be used as a pre-harvest grain store treatment or directly onto cereal grain as a protectant admixture
  • No withholding period for grain store applications
  • Apply 4 weeks before grain filling begins
  • For stores intended for oilseed rape: if the store is metal bins allow 4 weeks minimum before loading with oilseed rape. If concrete, this can be reduced to 1 day, but ideally leave 4 weeks between treatment and filing, to allow treatment to work.

Mites give rise to mould infestations as moisture and heat in the grain heap increases. Other storage pests also act as sources of allergens, fungal infections or bacterial infections leading to difficulties when feeding animals. Controlling them is key.” Peter says.

Flour mite

Picture courtesy of Central Science Laboratory, UK.

Applying Reldan 22

Reldan 22 is applied at 200 mls in 5 to 10 litres of water per 100 square metres of surface when treating the fabric of the store. The higher water volume should be used on porous surfaces.

Changes to usage on OSR storage  

If the store intended for OSR is metal, allow 4 weeks minimum before loading with rape seed. If the store is concrete, this can be reduced to 1 day but ideally 4 weeks is needed to allow pests to emerge from cracks and crevices and come into contact with the insecticide. One treatment only is allowed. There is no withholding period and up to 6 months protection of the store can be expected, giving long term peace of mind.