Glyphosate is an effective tool for pre-harvest perennial weed control but is not to be used as a desiccant. Always wait until seed moisture content is less than 30 per cent in the least mature areas of the crop before applying glyphosate.
By waiting until 50- 60 per cent seed colour change, you can be confident seed moisture will be less than 30 per cent. At this stage, seeds in the main stem will be green and firm to roll in the top third of the plant, mostly brown with some speckling in the middle third, and completely brown-black in the bottom third.
Apply when seed moisture is less than 30 per cent, in the greenest/least mature areas of the field. At this stage, the seed is firm and reasonable pressure from your thumbnail will leave a dent in the seed. Oats may not be accepted if treated pre-harvest – growers are advised to check with their grain buyer before applying glyphosate to oats. Malt barley will not be accepted if treated pre-harvest.
Application stages vary, by following the less than 30% moisture rule you can generally expect most pulses to be yellow/brown in colour, lost leaves, rattling pods.
Don’t let weeds to get in the way at harvest. Heat® LQ herbicide for pre‑harvest is a great tool for managing tough broadleaf weeds and supported for use on wheat, barley, and triticale.
To see a full range of application times for Heat, download the pre-harvest staging guide.
The only true desiccant on the market with a built-in adjuvant, Reglone® Ion herbicide is designed to speed up the natural drydown process.
Registered for use on:
To see the full range of application times for Reglone® Ion, visit https://www.syngenta.ca/Productsdetail/Reglone-Ion
For more great tips and Pre-Harvest advice, get in touch with your local P&H team.