6 May - Watch out for fluffy white mass

Adelgids: Check for the fluffy white mass of this pest on the needles of pines, junipers and Cedrus. Control with Dursban WG, Hallmark WZT (SOLA 2008-2944) or Talstar 80 Flo (until 30th May 2011) with a wetting agent.

Beech woolly aphid and cherry aphid: Apply Calypso (SOLA 2008-2831), Chess WG or Gazelle to outdoor ornamental cherries. Excellent control can be achieved with these products even if the cherry black aphid has started to distort the foliage. Woolly aphid on green and purple beech can also be controlled using one of these insecticides. I have seen this pest on pines too.

Feeding: Use a high-nitrogen liquid feed product now on nursery stock. Choose a 2:1:1 on sprinkler systems or 2:0:1 on drip systems. Avoid liquid feeding during warm days or in direct sunlight to prevent scorch.

Sucker insect: Present now on bay, citrus and Pyrus. Control with Calypso, Decis, Gazelle SG, Hallmark WZT, Savona or Spruzit depending on whether you operate an IPM system or not. SOLAs are required for some of these products for use on edible crops and will have application and harvest interval restrictions.

Blister mites: These can be present on Pyrus in May. Check stems and foliage (using a hand lens) of Pyrus, Sorbus and Fraxinus and spray with Hallmark WZT (SOLA 2008-2944) or Envidor (SOLA 2009-3366) if seen.

Vine weevil larvae: Grubs are now pupating, making them difficult to control. Active larvae may also be found in untreated containers. If the crop is ready for sale, drench with Intercept 70WG.

Aphids: Protected crops can have applications of Aphidius colemani to control melon cotton and peach potato aphids and Aphidius ervi for the potato aphid, glasshouse potato aphid and others.

IPM-friendly products include Aphox, Chess WG (SOLA 2008-2834), Majestik, Naturalis-L, Savona and SB Plant Invigorator. Other products include Actara (SOLA 2008-2801), Calypso (SOLAs required), Decis, Gazelle or Hallmark WZT (SOLA 2008-2944). Drenches of Intercept 70WG are effective in controlling aphids on crops subject to biological controls later in the season. Rotate products with different IRAC codes to avoid pest resistance.

Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

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

Read These Next

What is being done to develop biocontrols against orchard pests?

What is being done to develop biocontrols against orchard pests?

The SIVAL horticultural trade show in Angers, France, this week (16-18 January) heard about several initiatives to promote more environmentally sustainable orchard growing.

What does the 25-year plan mean for growers?

What does the 25-year plan mean for growers?

Published on 11 January, the Government's long-awaited 'A Green Future: Our 25 Year Plan to Improve the Environment' brings together a number of policy strands into a single framework that will impact many sectors, not least fresh produce, over the coming decades.

What will 'embracing change' mean for horticulture?

What will 'embracing change' mean for horticulture?

At the Oxford Farming Conference, whose theme was "embracing change", Defra secretary Michael Gove expanded on what a post-Brexit UK agriculture and land-use policy will look like and how it will impact farmers and growers.

Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Pest & Disease Tracker bulletin 

The latest pest and disease alerts, how to treat them, plus EAMU updates, sent direct to your inbox.

Sign up here

Professor Geoffrey Dixon

GreenGene International chair Geoff Dixon on the business of fresh produce production

Read Professor Geoffrey Dixon