APPROVAL FOR the first strobilurin that can be used in oilseed rape has been granted, Syngenta has announced.

The Pesticides Safety Directorate has given full label approval for the use of Amistar (azoxystrobin) from flowering to up to three weeks before harvest (GS 60 to 69+), the firm said.

“Amistar use in oilseed rape has two key benefits – keeping plants healthy and greener for longer to fulfil yield potential, and to reduce the build-up of Sclerotinia in the rotation,” said the firm‘s Bruce McKenzie.

Trials have found that Amistar can provide average yield increases of 0.4t/ha when applied at early to mid-flowering, he said.

“The development of fungicides that prolong leaf life beyond the flowering phase will significantly increase the post-flowering supply of assimilates,” added John Spink of ADAS Rosemaund.

“This would result in heavier seed and an increase in the number of seeds that reach harvestable weight.”

When used alone, Amistar should be applied at a rate of 1.0l/ha, or at 0.8l/ha when mixed with a partner with a different mode of action, noted Syngenta technical manager, Beth Hall.