28 June 2001
Super strain of take-all shows resistance
By Tom Allen-Stevens
DOUBTS have been cast over the effectiveness of the new seed treatment Latitude (silthiofam) after it emerged a strain of take-all may be resistant to it.
Research conducted by IACR-Long Ashton, has identified the field strain of the disease which has reduced sensitivity to Monsantos new active ingredient.
In the Long Ashton trials three strains of take-all G. gramimis were treated with silthiofam to determine the mode of action of the fungicide.
Two of the strains, coded DK22A and T7, were highly sensitive, whilst a third strain UK22A-1 exhibited lower sensitivity to the treatment.
The Long Ashton research scientists estimated the difference in sensitivity as 10,000 fold.
Colleagues at IACR Rothamsted report there is no evidence of take-all resistance to Jockey (fluquinconazole + prochloraz), however.
“UK wheat growers can remain confident in Jockeys ability to protect crops from take-all,” says Paul Cavell, Aventis development manager for seed treatments.
Jockey, launched last year, was the first take-all seed treatment to be approved for use in the UK, while Latitude was launched on 7 June this year.
Generally speaking, Latitude is believed to have the edge on take-all control alone, while Jockey is credited with some foliar disease activity as well.
The Long Ashton research was published at the 2000 Brighton Crop Protection Conference.
Take-all is a soil borne fungal disease which costs UK cereal growers anything from 16 million to 55m each year.
- Thumbs-up for new take-all remedy, FWi, 7 June, 2001
- Cereals 2000 Launch For Take-All Seed Treatment, Farmers Weekly, 16 June, 2000
- Tackling Take-all – Arable Action advice on FWi
FREE NEWS UPDATE
CLICK HERE to receive FWis FREE new daily email newsletter to keep up-to-date with the latest news of foot-and-mouth and other farming-related stories