South: Spraying spring crops

Now that T1 fungicides have been done on the wheat, attention has turned to T2 on winter barley and T1 on spring barley.  Winter barleys have awns emerging or are very close to it. These can contribute 20-25% of yield so it’s important that T2 fungicides cover the them.  Generally crops are looking fairly clean but rhyncho and net blotch is lurking at lowish levels.  As soon as dry weather returns rusts will become more of an issue.  Treatments of Jaunt (prothioconazole + fluoxastrobin + trifloxystrobin) and Arizona (folpet) have held well and will get repeated now.  PGR programmes have been robust, so hopefully these crops will stay standing they have good yield potential, so are likely to have a lot of weight to carry…

Spring barley is now tillering well with the most forward crops now at four tillers and rows filling in quickly, so T1 fungicides and herbicides are needed rapidly. At the moment; cleavers, bindweed and volunteer osr seem to be the prolific weeds with many still germinating.  Blackgrass has been hit well by stale seedbeds, pre-em sprays and where needed Axial.  Hopefully we won’t see any more coming through now.  Fungicide is likely to centre round Jaunt with Fielder (chlorothalonil and proquinazid) where Mildew control is needed.

Oats have started to move now with most winter crops now at GS31 with some GS32. Mildew and crown rust are the main diseases visible at the moment but I have found some isolated cases of septoria as well. It is best if growth regulators are separated out, yes it does mean an extra pass with the sprayer, but if it saves turning a crop purple it is money worth spending. Don’t forget that spring oats are more susceptible to stress than winter oats.  Where Absolute (flupyrsulfuron + diflufenican) was used in the autumn crops are fairly clean. There are patches of cleavers, speedwell and various others that will need taking out with the T1 fungicide at GS31.  PGRS’s can then go on at GS32 or at least a week later.

Maize drilling season has arrived and some have already been in a fortnight, but have yet to emerge. In my opinion we shouldn’t be drilling maize until the last week of April at the earliest.  With the rain that has been around, seed-beds are warm and moist so pre-emergence sprays have every chance of doing a good job this year.  The key with maize is to get it flying out of the ground as soon as it gets drilled, it doesn’t like competition so pre-ems take some of this early pressure off the crop. In most situations a follow up spray will be needed but it will be slightly later than crops where no pre-emergence is done.




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