Arable News

  • Written by: Farmers Guide
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Mancozeb multi-site

CRD recently announced that there was an error in the mancozeb HSE impact assessment carried out by the Water Research Centre (WRc) and that it has now been concluded that mancozeb (ETU, a metabolite) is an endocrine disrupter (ED) less likely to pose a risk or of low regulatory concern, says UPL.

In 2014 UPL commissioned ADAS to carry out a trial to compare the efficacy of three multi-site actives in a fungicide programme and to determine an optimum dose rate for mancozeb in winter wheat.

Results indicated that mancozeb was not quite as effective as chlorothalonil but slightly better than folpet when looking at the control of septoria tritici on L1, L2 and L3.

Properties of multi-site fungicides

Mancozeb belongs to the dithocarbamate grouping of fungicides and to the class of compounds known as ethylene bisdithiocarbamates (EHBDCs). The Fungicide Resistance ActionCommittee (FRAC) places the dithiocarbamates into the mode-of-action group M(Multi-Site Action).

In wheat UPL mancozeb products, PENNCOZEB 80WP, PENNCOZEB WG and MANZATE 75WG can be used in tank mix with other fungicides with different modes of action as part of an anti-resistance strategy.

Used in partnership with triazole, strobilurin or SDHI products, PENNCOZEB 80WP, PENNCOZEBWG or MANZATE 75WG can offer an alternative to the protectant multi-site fungicide actives chlorothalonil or folpet as part of a septoriatritici or septoria leaf blotch (Zymoseptoriatritici) control programme.

Mancozeb also has proven activity against mildew, yellow rust and brown rust. HGCA wheat disease activity ratings for multi-site fungicides approved for use on wheat in the UK are shown in Table 1, click here for the full update.

Further information about mancozeb can be found at, adds UPL.

  • Written by: Farmers Guide
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