26 July 2001
New strob strides ahead on yield
By Tom Allen-Stevens
The new strobilurin from Syngenta, picoxystrobin, has delivered over 1 tonne per ha more yield than other strobilurins in barley trials harvested on Monday (23 July).
The trials were conducted by the manufacturer and carried out on Fanfare winter barley at Moundsmere Estate, near Basingstoke, Hampshire.
The highest yielding picoxystrobin programme of two sprays of picoxystrobin + Unix (cyprodinil) produced yields averaging 9.8 t/ha.
That compared with just 8.7 t/ha from two sprays of kresoxim-methyl + epoxiconazole.
Untreated yield was 8.6t/ha and two sprays of Amistar (azoxystrobin) + Unix produced 9.6 t/ha.
According to Syngentas David Ranner, Unix + strobilurin programmes are now the standards in barley by which other fungicides are judged.
Up to a quarter of the area of leaves 2 to 4 had been lost to Rhynchosporium in this trial earlier in the year, added Mr Ranner.
But the picoxystrobin + Unix programme contained this to just 6%. Kresoxim-methyl + epoxiconazole contained it to 12%.
He puts the strobs efficacy down do its good curative activity – said to be better than triazoles against net blotch.
The molecule also redistributes itself around the plant systemically and through vapour action, making it the most mobile strobilurin yet, says Syngenta.
Picoxystrobin has already been approved for use in Ireland and is expected to be approved here in time for use in spring 2002.