T1 timing for spring barley is around the corner
This season has seen a wide range of spring barley drilling dates mostly due to the weather. As a result growth stages vary widely, from pre-emergence through to end of tillering at GS29. As we approach optimum T1 timing before stem extension it’s time to consider adapting your disease management programme. Don’t forget that not all varieties are the same and should be treated according to their disease profile and local risk.
Regardless of drilling date, an adaptive disease management programme will be key to keeping the lower and upper plant clean. It is likely that the crop will grow rapidly and race through the growth stages, especially in the later drilled crops, meaning there is no time for a T0 spray. The result of such rapid growth is a limited spray window, which makes a programmed approach to disease management all the more important as the lower leaves contribute more to yield in barley than in wheat.
Drilling date, weather, location and variety can all affect disease pressure and the disease management programme should consider these factors and allow adjustments to be made as required. If your spring barley was drilled early you may need to spray twice to protect from disease and also help reduce brackling. The main disease issue last season was brown rust and the forecast increase in temperatures will increase the risk. If your variety doesn’t have a high brown rust resistance you will want to ensure you cover this with your T1 spray.
Spring barley also suffered from brackling last season due to drought conditions resulting in a late nitrogen uptake followed by quick growth and weakening stems. One of the greatest factors was location so it is worth factoring this into your disease programme to avoid yield losses.
The strongest programme for the control of a range of diseases includes SDHI and prothioconazole. A mixed chemistry approach should be adopted to reduce the risk of resistance. Brown rust is likely to be an issue later on in the season. ELATUSTM Era is very strong on brown rust in addition to having good activity on Rhynchosporium and Net Blotch. Trials* have shown that ELATUS Era can also help to reduce brackling and that the use of a chlorothalonil product, such as Bravo® 500, in your programme is also key to control ramularia.
Iain Hamilton, Senior Field Technical Manager
*Syngenta and independent trials
The Syngenta Innovation Centres are specialist sites spread throughout the UK, with technical field experts trialling conditions, varieties, treatments and techniques to provide advice for agronomists and farmers. Come along to one of our open days to learn more about their research, and how it can benefit your crops. Find the dates and locations here.