Experts highlight need for updated fungicides

New fungicides to control basal rot of narcissus are needed to reduce the likelihood of resistance developing, according to experts.

Consultant Gordon Hanks told growers at the Horticultural Development Company (HDC) and British Daffodil Growers Association narcissus technical seminar that thiabendazole (Storite or Tezate) and chlorothalonil (Bravo) are the only fungicides approved for bulb dips. The industry is relying on too few active ingredients, especially with the high frequency of pesticide losses.

John Clarkson of Warwick Crop Centre spoke about research project BOF 74, screening in vitro fungicides with the potential to control basal rot, while East Malling researcher Ralph Noble told the seminar about controlling Fusarium basal rot with biological treatments.

Royal Dutch Flower Bulb Growers Association plant protection products policy adviser Paul Venderbosch gave an update on current bulb dipping procedures in the Netherlands.

ADAS consultant Erika Wedgewood spoke about HDC project BOF 72 on fungicides for improved control of white mould and smoulder while breeder Brian Duncan gave a talk on breeding desirable attributes into commercial narcissus varieties. Other topics covered included alternative herbicides and insecticides for the control of large narcissus fly.


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