1 May - Drains and mites

Drains Display nursery drainage plans for staff to identify drain locations and ensure absorbent materials are available to prevent pollution. Use Environment Agency leaflet PPG21 and the Code of Practice for Using Plant Protection Products as guidance for spillage prevention.

Tarsonemid mites Apply Apollo 50SC (EAMU 2014-1271), Dynamec, Envidor (EAMU 2012-0254), Oberon (EAMU 2004-1718) or Sequel (EAMU 2014-2835). Use biological control agents such as Amblyseius cucumeris, A. andersoni and A. californicus, checking compatibility of the products.

Oak tip midge Apply Dursban WG, Gazelle SG, Hallmark WZT (EAMU 2008-2944) or Movento (EAMU 2011-1987) to vulnerable outdoor crops.

Leaf miners Introduce Dacnusa and Diglyphus wasps or apply Calypso (non-IPM, EAMUs required), Dynamec or Hallmark WZT (non-IPM, EAMU 2008-2944).

Water conditioners Use products such as Companion Gold, Guide, Li-700, Ranger, Scout, Spraymac, X-Change or Validate to improve water condition used for pesticide applications. These will reduce the effect of the calcium and magnesium in water. Some also have anti-foaming properties.

Thuja Preventive applications of Bravo 500 (EAMU 2011-1130), Octave, Signum (EAMU 2012-2141) or Switch will control the spread of needle cast diseases that cause brown fronds.

Irrigation Keep crops together that have similar water requirements and pot sizes. Regularly check crops along bed edges and pathways - do not assume automatic irrigation systems are producing an even output at the right intervals.

Scab This can infect overhead-irrigated protected crops too. Use protectant and eradicant products for good control, such as Topas followed by Dithianon WG, Signum (EAMU 2012-2141) or Systhane 20EW.

Ribes blister aphid Feeding causes leaf distortion, blistering and discolouration and the pests are now active on crops. Control with Decis, Hallmark WZT (EAMU 2008-2944), Spruzit or Pyrethrum 5EC.

Flea beetles Control with Chess WG (EAMU 2013-2016), Calypso (EAMUs required), Decis (non-IPM), Majestik, SB Plant Invigorator, Hallmark WZT (non-IPM, EAMU 2008-2944) or Pyrethrum 5EC on Crambe, fuchsia and wallflowers.

John Adlam, Managing director, Dove Associates

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