Live monitoring of fusarium on wheat (2008)
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Untreated plots of Robigus, at five sites, are assessed every two weeks for symptoms of Fusarium diseases.
Isolations are also carried out to identify the species present on each leaf layer.
9 July 2008: The national survey of commercially grown winter wheat is ongoing and thirty-five percent of samples have so far been assessed for disease symptoms. Isolation results from the first 18 samples received with FHB symptoms (16 from the South East and 2 from the South West) are now available. These early isolations show that Microdochium species (non toxin producers) and Fusarium poae are the most common pathogens found (from 61% of samples). The toxin producing F.graminearum and F.culmorum have been isolated from 39% and 5% of samples respectively. 25 June 2008: Leaf isolations from 4 of the 5 Fusarium monitoring sites (Caythorpe, Morley, Andover and Cirencester) have shown that F. culmorum and F. graminearum (toxin producers) and Microdochium majus (non-toxin producer) were present on the top two leaves during flowering. The presence of Fusarium head blight (FHB) pathogens on the upper leaves indicates they are also likely to be present on the ear. As a result, crops not treated with an appropriate T3 spray will be open to FHB infection and possible mycotoxin contamination. FHB symptoms have already been reported on the ear in the south east (see latest news - 23/06/2008). 10 June 2008: Levels of stem base Microdochium infection remain lower than at the equivalent time last year. Leaf isolations are showing the presence of Fusarium species at all of the five monitoring sites. At most sites Fusarium culmorum has been isolated from leaf 3. The latest results show that at Cirencester F.culmorum has been isolated from the flag leaf. 29 May 2008: Generally, levels of stem base infection are still lower than at the equivalent time last year. Microdochium levels are highest at Morley and Andover with 80% of stem bases infected. Levels at the other sites range between 30 and 40%. Only trace levels of Fusarium species are being isolated from stem bases. In contrast, leaf isolations are showing the presence of Fusarium species at all of the five monitoring sites. F. culmorum has been isolated from leaf 3 at Caythorpe, Morley, Andover and Cirencester. Both F. culmorum and F. graminearum have been isolated at York. 06 May 2008: In general, the level of stem base infection is lower than at the equivalent time last year. Microdochium species (non toxin producers) have been isolated at all sites, with levels highest at Andover and Morley (80% and 50% respectively) and lowest at Cirencester and Caythorpe (10% and 12% respectively). Leaf isolation results are currently available for three sites (York, Caythorpe and Morley). These early isolations indicate presence of Microdochium species at all three sites, and F. culmorum (toxin producer) at Caythorpe and Morley. Latest news
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