Friday, 30 March 2012

High numbers of wild-oats warrant treatment with Warrant

With reports of higher than normal spring-germinating wild-oats showing up in wheat, growers are being advised to plan which fields would warrant a herbicide application later on this spring, according to Dr. David Stormonth, Technical Manager for Interfarm UK Ltd.

“ADAS are reporting greater numbers of wild-oats appearing in wheat this year. With the economic threshold being just 1 plant every 2 square metres, growers should be prepared to apply a post-emergence herbicide once weed emergence is complete. Emergence this spring started around the end of February and most wild-oats are currently around the 1 leaf stage. There is still time to wait for the rest to emerge before applying a contact herbicide, but don’t wait until the crop canopy closes over and makes coverage difficult. A foliar-acting herbicide based on the active ingredient fenoxaprop-p, Warrant is recognised as being a very effective post-emergence grass-weed herbicide, particularly on wild-oats,” explains David.

 “Warrant contains 83 g/l of fenoxaprop-p and the dose rate varies according to weed size. It is recommended at a dose rate of 0.33 l/ha plus an appropriate adjuvant for wild-oats up to Growth Stage 23, or 0.5 l/ha plus adjuvant for wild-oats up to Growth Stage 30, or 0.66 l/ha plus adjuvant for weeds up to GS 39,” advises Dr. Stormonth.

 As well as wild-oats, Warrant has good activity on rough-meadow-grass and awned canary grass from two leaves up to Growth Stage 31 of the weed.  “It can also be mixed with many broad-leaved weed herbicides to tidy up on weed control. Warrant has excellent crop safety and no LERAP,” reminds David.

He warns growers not to overlook wild-oats as they are the most competitive annual grass-weed in cereals.  “This is because they have a very similar growth habit to cereals, yet can grow even larger, sucking up valuable moisture and nutrients as well as literally shading the crop. Wild-oats also contaminate grain and are costly to remove. They can act as hosts for some damaging viruses, insect pests and nematodes. Do not ignore wild-oats, especially in such as season as this when wheat prices are good and many crops look to have good yield potential,” says Dr. David Stormonth.

For further comment and information, please contact Dr. David Stormonth, Technical Manager, Interfarm UK Ltd. on 01354 741414 or 07818 036506 (mobile) or via e-mail david.stormonth@interfarm.co.uk