Arable
Consider late season fungicide programmes carefully
G
rowers are being advised to consider late season fungicide programmes
carefully amid reports of low dis- ease pressure this year. Moderate disease levels in wheat due to the hot, dry sum- mer in 2018 generally resulted in cost-effective but lower yield re- sponses to fungicide programmes than the previous season, says Hutchinsons technical director David Ellerton.
“Despite the dry conditions later in the season, the largest yield increases were often in re- sponse to the flag leaf or T2 timing in Hutchinsons small plot trials, although drought and subse- quent early senescence reduced the response in many cases.” In Hutchinsons winter wheat variety trials, the average yield response across sites and all va- rieties was 1.54 t/ha (17.28 % of final yield) compared to 2.64t/ha (28.48% of final yield) the previ- ous season, said Dr Ellerton. But there was a significant
difference between varieties
with Reflection giving a response 2.67 t/ha, while disease control in Santiago,
LG Rhythm and Gleam result- ed in an increase in yield of over 2 t/ha.
“It is important to realise that the gap between the flag leaf spray and the previous T1 fun- gicide should be a maximum of three to four weeks to continue disease protection, once the ear- lier spray begins to run out of steam,” says Dr Ellerton. For ear emergence T3 sprays,
triazoles often form the base, in- cluding active ingredients with activity on Fusarium – favoured by warm, wet conditions – such as prothioconazole, tebuconazole or metconazole/epoxiconazole. “Where Microdochium risk is
high in cool, wet seasons, the em- phasis should be on prothiocona- zole – although in last seasons’ AHDB trials the multi-site prod- uct mancozeb was also found to give useful control.”
Drought and early senescence reduces yield
response, says David Ellerton
Costello, Leeds,
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yara.com JUNE 2019 • ANGLIA FARMER 23
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