Take-all in winter wheat - management guidelines (HGCA Autumn 2006)

Seed treatment fungicides

Seed treatments are available based on two active ingredients: fluquinconazole (plus prochloraz as Jockey) and silthiofam (Latitude). Both treatments give only partial control of take-all and should be used along with other measures to minimise its effects (Table 3).

HGCA-funded trials have compared the seed-treatment fungicides (Table 4).

Table 3. When is seed treatment justified?

Crop sown Treatment
First wheat Treat only if there is a known risk, eg many cereal volunteers or much couch grass in preceding break crop.
Second wheat Treat particularly if there is a known risk, eg
take-all regularly occurs in second wheats on the farm;
crop follows a first wheat sown very early.
Third wheat Use seed treatment, but grow a crop only if second wheat appeared healthy during grain filling and yielded well. NB yields will still be reduced.
Do not sow, with or without treatment, if second wheat appeared poor in July with distinct root blackening.
Continuous wheat At-risk crops entering a long run (second, third or Making use of even fourth wheat) may be treated to increase yield. take-all decline In some circumstances this may delay establishment of effective take-all decline.

Table 4. Main features of take-all seed-treatment fungicides

Silthiofam Fluquinconazole
Early acting against primary infection Longer acting provides suppression of primary and secondary infection
Yield benefit typically up to 1.02.0t/ha where take-all is moderate to severe Yield benefit typically up to 0.51.5t/ha where take-all is moderate to severe
Take-all specific Active against take-all and delays foliar diseases, eg yellow rust and Septoria
Often better than fluquinconazole when applied to successive crops in trials Some evidence of detrimental effects when used as a repeat treatment

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