28 April - Aphids & infections

Aphids - With pest numbers building, particularly on protected crops, control them using predators alongside Aphox, Chess WG (EAMUs required), Majestik, Naturalis-L, Pyrethrum 5EC, Savona or SB Plant Invigorator.

Bacterial infections - Avoid late-afternoon overhead irrigation on vulnerable Prunus spp. so foliage is not left wet for long periods.

Toppel 100 - Note that EAMU 2015-1454 associated with MAPP 15696 loses its approval at the end of this month. The replacement MAPP 17071 currently has an on-label approval for use on outdoor ornamentals with no EAMU for protected crops.

Downy mildew - Humid conditions will encourage this disease on a range of crops. Control using Amistar (EAMU 2009-0443), Fenomenal (EAMU 2013-1990), Fubol Gold WG (EAMU 2013-2288), Invader (EAMU 2012-0109), Paraat (EAMU 2011-2585), Pergado Uni (EAMU 2012-1605), Signum (EAMU 2012-2141) or Valbon (EAMU 2014-2325). Some products have similar active ingredients so take care with spray programmes. Protect crops using Bravo 500 (EAMU 2011-1130), Dithane 945 (EAMUs required), Karamate Dry Flo Neotec, Pergado Uni (EAMU 2012-1605) or Proplant (EAMUs required) on buddleia, Cirsium, digitalis, geum, hebe, impatiens, osteospermum, pansy, rose and others.

Flea beetles - Control damage on Crambe, fuchsia, wallflowers and others using Chess WG (EAMUs required), Calypso (EAMUs required), Decis (non-IPM, EAMU 2014-1011), Majestik, SB Plant Invigorator, Hallmark WZT (non-IPM, EAMU 2008-2944), Pyrethrum 5EC or Spruzit.

Bark beetles - Apply Decis, Hallmark WZT (EAMU 2008-2944) or Toppel 100 (EAMU 2015-1454) directly onto stems of pines, cherries and other vulnerable crops to control emerging pests.

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

Vine weevil - Check vulnerable crops and any trap plants thoroughly now for signs of larvae. Apply nematodes when soil and compost temperatures are consistently above 5 degsC.

Whitefly - Introduce Encarsia and Eretmocerus when "scale" stage is present. 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 (EAMU 2014-1011), Gazelle SG, Spruzit or Toppel 100 (EAMU 2015-1454).

HorticultureWeek.co.uk/nursery


Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus
Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs