United Kingdom
February 3, 2015
Yellow rust in spring 2014
Spring 2014 was characterised by high levels of rust pressure in wheat, symptoms of which were clearly visible early in the season. Crops this year are not as far forward and symptoms of disease are not quite as apparent but inoculum is present. Most varieties in the ground are rust susceptible and emerging new races continue to increase the threat. The most effective approach to tackle disease and maintain yield potential is via preventative fungicide application. Application of fungicides before growth stage 32 (the so called T0 sprays) are as important as ever.
The HGCA fungicide curves support pyraclostrobin and epoxiconazole as key actives against rust
An appropriate spray prior to growth stage 32 can relieve the pressure on subsequent yield building sprays (applied at growth stages 32 and 39), improving the likelihood these sprays will be made in a preventative situation and maximising their efficacy.
Fungicide resistance management is another key consideration in product choice, a pre growth stage 32 spray should contain active ingredients which have efficacy against primarily rusts and mildew (if this is present in the crop). They should also be effective at damping down the threat of Septoria.
Comet 200 (containing pyraclostrobin) has excellent efficacy against both brown and yellow rust in wheat, whilst retaining some activity against Septoria. Comet 200 mixed with a mildewicide such as fenpropimorph (Corbel) or a suitable rust active triazole such as epoxiconazole will ensure the main early disease threats are guarded against. BASF recommend the use of chlorothalonil in all sprays up to and including growth stage 39 as a key resistance management measure.
BASF T0 Recommendation:
Comet 200 0.4L/ha + rust active triazole or + Corbel 0.3L/ha (or a co-formulated product such as Opus Team 0.5L/ha or Capalo 0.65L/ha). In addition, include 1 litre of a 500 g chlorothalonil formulation such as Bravo 500.
For more information about Comet 200 click this link.
Comet 200 contains pyraclostrobin. Corbel contains fenpropimorph.
TB04/15
Species
