15 April - Wilt and bugs

Blossom wilt Check cherries, plums, damsons and apricots. Apply Systhane 20EW (EAMUs required) to prevent infections. Control with Indar 5EW (EAMU 2003-1372), Signum (EAMU 2010-2109) or Switch (EAMU 2010-3092).

Capsid bugs Spray Calypso (EAMU 2014-2151) Decis, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2013-2410) if damage is found. Well-timed applications of Chess WG (EAMU 2013-2016) will prevent damage to Caryopteris, choisya, dahlia, forsythia, hydrangea and roses.

Whitefly High numbers of adults will reduce predator effectiveness. Introducing Encarsia and Eretmocerus can help when the scale stage is found. Hang cards away from sun and direct irrigation. Apply Chess WG (EAMU 2013-2016), Majestik, Mainman (EAMU 2013-0045) Naturalis-L, Pyrethrum 5EC, Savona and SB Plant Invigorator. For non-IPM systems, include Decis, Gazelle SG, Spruzit or Toppel 100 (EAMU 2013-2410).

Sciarid fly Install yellow sticky traps to attract adults. Drench with nematodes (Steinernema feltiae) or introduce Hypoaspis or Macrocheles mites. For significant infestations, introduce rove beetle Atheta coriaria. Insecticides for ornamentals include Calypso (EAMU 2014-2153), Decis (non-IPM) and Dimilin Flo, or incorporate Met52 (EAMU 2011-1997) in the compost.

Powdery mildew Check glasshouse crops including Lonicera and azaleas for signs of early attack. Apply food-grade potassium bicarbonate, Signum (EAMU 2012-2141) or Nimrod followed by Systhane 20EW.

Box blight Apply Octave, Signum (EAMU 2012-2141) or Switch to Buxus. Only prune plants in mild, dry conditions - use sharp tools and an approved disinfectant to clean blades.

Herbicides Spot-treat outdoor perennial weeds with Depitox (EAMU 2008-2843), Dow Shield 400 (EAMUs required) or glyphosate. Control grasses using Aramo (EAMU 2015-0454), Falcon or Laser.

Lupins Colletotrichum is seed-borne and produces telltale spiralling of foliage. Apply Cercobin WG (EAMUs required), Octave or Switch.

Leaf crinkle Differences in day and night temperatures can cause leaf crinkling. Leafy crops - Aucuba, Prunus and some herbaceous - are more prone to distortion. Ventilate during warm days and apply fleece or Cosytex to vulnerable crops.


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