Chlorpyrifos Use Changes & Merit® Turf Withdrawal

Two recent developments in the control of Leatherjackets (larvae of Craneflies – Tipula spp.) and Chafer grubs (larvae of various species but especially Melolontha melolontha and Phyllopertha horticola) are set to have a major impact on golf course management.

Firstly, a three month period to use remaining Cyren, Dursban and other products containing Chlorypyrifos for the control of Leatherjackets on amenity turf came into effect on 1st June This means that you have until midnight on 31 August 2015 to use or dispose of all existing stock. More information on this can be found on the BIGGA website.

Secondly, Merit® Turf, which is a granular insecticide containing Imidacloprid for the control of Chafer grubs and Leatherjackets, has received formal notification from the Chemicals Regulation Directorate (CRD) that it must be withdrawn from the market.

As a result of the withdrawal Bayer, the manufacturer, has until the end of October this year to sell Merit® Turf and end users have until the end of October 2016 to use it. This means you will be able to purchase sufficient stock this year for a 2016 application. Bayer is currently re-registering Merit® Turf and if successful it would then be available for 2017. More information on the withdrawal can also be found on the BIGGA website BIGGA website.

There are no other substitutes currently available for these products, however, research is being undertaken on the use of natural nitric acids and it is hoped this will be stepped up following these developments.


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