We have now had a very wet start to the farming year, too wet to travel with a sprayer or a fertilizer spreader and delays in spring crop planting due to soil conditions. What factors do we need to consider for our T1 fungicide application in Winter Wheat, when we are able to travel again?
If we have been unable to apply a T0 fungicide spray then maximum yield potential has already been lost, it is essential that we apply a robust fungicide mix of a triazole + SDHI + multi site as soon as possible to maintain yield. With the current warmer conditions and wet micro climates in the base of the crop, these are ideal conditions for the development of Septoria. In our own trials Septoria has been observed even in varieties such as Graham & Siskin, which have the best disease resistance ratings to Septoria. Keep rates robust to maximise any curative action and give max persistency, especially on crops which may only just be at Growth Stage 30/31.
Where a T0 has been applied, again robust triazole + SDHI + multi site need to be applied once at GS 31/32, the earlier T0 spray will help to maximise yield potential and buys us a little bit of time. We are aiming to apply these products as protectants especially where Septoria is our target disease. A robust dose at T1 gives us the flexibility to re assess risks when planning our T2 application.
Other factors we need to consider are poor rooting due to the wet growing season so far, some SDHI fungicides encourage rooting more than others or zinc based compounds will also encourage rooting and will reduce the risk of crop damage when applying some of the very complicated T1 applications which have been forced upon us.