Most crops have Septoria on the lower leaves, ready to move up the plant, even in treated crops.
Brown rust is developing in many varieties especially in the western region.
Recent weather conditions, warm and wet have been ideal for the development of these diseases.
Why do we need to apply more fungicide to a clean flag leaf?
The products we use now are primarily protectant and we aim to keep the plant disease free through ear development and grain fill, this adds up 0.18t/ha per day and maintains grain quality up to harvest. Further treatments may be necessary if disease continues to develop.
Will the treatment ‘cost the earth’?
The cost of a T3 is relatively small compared to previous treatments but is essential to keep the plant developing for longer, which transposes into improved yield and quality.
Are we topping up foliar disease control to protect us through to harvest or are we targeting for fusarium ear blight?
If we are targeting fusarium ear blight then the optimum timing for application is early to mid-flowering, which may be only 7-10 days after the T2, the fungicide needs to coat and protect the ear and anthers before disease starts to infect the plant, use a product based on prothioconazole, tebuconazole, metconazole or thiophanate- methyl. Also consider adding a multi-site material at this timing.
We are also noticing that certain varieties are flowering very soon after ear emergence, a clear indication that these crops are under stress. Consider a late trace element top up, especially Magnesium which seems to have been an element which crops have been short of all season. Magnesium is easily leached out of wet soils and is a key element for photosynthesis. Remember once varieties have flowered they are no longer at risk to wheat blossom midge damage.