The case for spraying before GS32 is even more compelling where disease is already well developed. Strobilurins are probably better reserved for later spray timings in Northern Ireland, because of our prolonged ripening period. This year many spring barley crops are being grown in high fertility positions in the rotation that were originally earmarked for winter wheat. Nitrogen dressings and the need for growth regulators should therefore be re-evaluated for crops in these situations. Monitor crops carefully after sowing for leatherjacket damage.
Crops following grass or grassy stubbles are particularly at risk.
Examine ten 30cm lengths of drill selected at random throughout the crop. If 10 or more leatherjackets are found from the 10 lengths of drill, then insecticide treatment is justified. Commonly used products are for control of leatherjackets include Dursban 4 and Spannit. If you need to move livestock to land via public roads you must contact your local DVO to obtain a movement licence. For further information contact your local Greenmount Development Adviser.