Science Into Practice - New fungicides to defend crops

The fungal diseases smoulder (Botrytis narcissicola) and white mould (Ramularia vallisumbrosae) are favoured by wet weather and likely to become more of a problem if the climate changes as predicted.

Many fungicides on which narcissus growers once relied are no longer available so new options are needed.

In HDC project BOF 072, 15 fungicides were compared in programmes with an emphasis on effectiveness, resistance management and harvest interval. The project was extended for a year (BOF 072a) to continue monitoring treated plots to gain more data on smoulder control and find out to what extent treatments made in 2012 affected disease levels and crop performance in 2013.

"Identifying new fungicide programmes gives us a much better chance of managing these diseases cost-effectively into the future," says Mark Clark of Grampian Growers.

The results so far show that white mould manifested as the main disease in the trials, with very little smoulder. Several fungicides were more effective than Amistar (azoxystrobin), the current industry standard. Up to three sprays applied immediately after flower picking, using two or more of these products, controlled white mould well and markedly deleted senescence.

Preliminary results suggest treatments that delayed senescence last year led to improved flower cropping this year and fungicides that reduced white mould in 2012 resulted in less white mould this year. Some of the fungicides have already been adopted into commercial disease-control programmes.

Horticultural Development Company

For details on all HDC activity, visit

Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Read These Next

Is leaving the EU an opportunity to harness the potential of agri-tech?

Is leaving the EU an opportunity to harness the potential of agri-tech?

A group of leading industry and research figures has agreed a series of agri-tech measures that will be recommended to Government as a means of making British farming more profitable and productive post-Brexit.

What do fruit and vegetable growers hope for from a renationalised farming policy?

What do fruit and vegetable growers hope for from a renationalised farming policy?

Defra's "Health & Harmony" consultation paper, which closed for responses this week, has given growers and their representative bodies a chance to shape the largest reformulation of farming and land-use policy in nearly half a century.

Protected Cropping Structures - Polytunnels

Protected Cropping Structures - Polytunnels

Cost factors, ventilation benefits and the ability to fit new advanced films are some of the reasons behind the popularity of these structures, says Sally Drury.

Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +

Horticulture Week Top UK FRUIT PRODUCERS

See our exclusive ranking of fruit producers by annual turnover. 

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