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05/09/2006
Volunteer threat to early sown OSR crops
The rapid progress of harvest this season, and the stop/start conditions for those who have not yet finished, has tempted many growers to get on with oilseed rape drilling two to three weeks ahead of normal.
The ideal conditions with warm, damp seed beds means some crops are already up, but they are facing intense competition from volunteer cereals. "We know that competition in the first weeks of establishment has the greatest effect on final yield," warns Syngenta Technical Manger, Iain Hamilton.
"Crops established by min-till and broadcast are most susceptible to an early flush of volunteers. Growers need to prioritise volunteer control at the earliest opportunity," he advises.
The rain fast activity of Fusilade Max makes it especially suitable for applications in showery autumn conditions. The quick acting formulation is rapidly adsorbed by weeds and unaffected by rain in less than one hour. The herbicide is crop safe from cotyledon stage of the crop
"If it becomes hot and sunny farmers want to get on and complete harvest, not be spraying oilseed rape," adds Mr Hamilton. Young volunteers and grass weeds, including wild-oats and brome, can be very cost-effectively controlled with Fusilade Max with rates as low as 0.4 l/ha, he advises. But if weeds have become stronger - past the three to four leaf stage - then there's the flexibility to increase applications rates.
Mr Hamilton reminds growers that under new industry herbicide resistance guidelines only one application of Fusilade Max can be made per crop, but growers can follow this with another fop or dim graminicide if it is required to control secondary flush of weeds.
"If they get the initial Fusilade Max timing right, and the oilseed rape continues to grow strongly and shades out competition, then a single application may suffice," he adds.
Phoma risk
Bands of rain sweeping across the country, combined with sunny intervals, are the ideal conditions for the development of Phoma ascospores on last year's stubble, highlights Iain Hamilton. If the weather pattern continues, it could lead to very early infective spore production and risk to small oilseed rape seedlings. "Growers must remain alert to the risk and be ready to treat with Plover if infection occurs," he advises.
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The ideal conditions with warm, damp seed beds means some crops are already up, but they are facing intense competition from volunteer cereals. "We know that competition in the first weeks of establishment has the greatest effect on final yield," warns Syngenta Technical Manger, Iain Hamilton.
"Crops established by min-till and broadcast are most susceptible to an early flush of volunteers. Growers need to prioritise volunteer control at the earliest opportunity," he advises.
The rain fast activity of Fusilade Max makes it especially suitable for applications in showery autumn conditions. The quick acting formulation is rapidly adsorbed by weeds and unaffected by rain in less than one hour. The herbicide is crop safe from cotyledon stage of the crop
"If it becomes hot and sunny farmers want to get on and complete harvest, not be spraying oilseed rape," adds Mr Hamilton. Young volunteers and grass weeds, including wild-oats and brome, can be very cost-effectively controlled with Fusilade Max with rates as low as 0.4 l/ha, he advises. But if weeds have become stronger - past the three to four leaf stage - then there's the flexibility to increase applications rates.
Mr Hamilton reminds growers that under new industry herbicide resistance guidelines only one application of Fusilade Max can be made per crop, but growers can follow this with another fop or dim graminicide if it is required to control secondary flush of weeds.
"If they get the initial Fusilade Max timing right, and the oilseed rape continues to grow strongly and shades out competition, then a single application may suffice," he adds.
Phoma risk
Bands of rain sweeping across the country, combined with sunny intervals, are the ideal conditions for the development of Phoma ascospores on last year's stubble, highlights Iain Hamilton. If the weather pattern continues, it could lead to very early infective spore production and risk to small oilseed rape seedlings. "Growers must remain alert to the risk and be ready to treat with Plover if infection occurs," he advises.
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