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Variable germination combined with recent rain place REGLONE front of mind for a hassle free harvest


Following abnormal establishment conditions, many canola and cereal crops experienced variable germination, which is likely to result in uneven pod and head maturity at harvest. Combined with recent widespread rains, growers will likely face the prospect of in-crop weed pressure at harvest time, and strong demand for desiccation aids is anticipated to ensure a timely and efficient harvest, protecting crop yield and quality. Responsibility to avoid herbicide residues in deliveries of cereal, pulse and oilseed grains rests on the shoulders of grain growers and their advisers, so it’s timely to review the non-selective herbicides that are registered for late season application. The following chart summarises this well:

Crop Type






Barley (Malt)



Barley (Feed/Food)


√ *

(via Grain Producers Australia Permit 82594)







Faba beans

Field peas




(via Pulse Australia permit 81595)

√ = registered for pre-harvest use      × = not registered for use

Information courtesy of Grain Industry Association of Western Australia Inc

* Applies only to use of Nufarm DST & Argo Dual Salt Technology Herbicide

Paraquat formulations such as GRAMOXONE® 360 PRO can be used for spray topping annual ryegrass late in the season in chickpeas, lentils, lupins, vetch, faba beans and field peas, but not in wheat, barley, oats or canola. A seven day withholding period applies to pulse crops treated with GRAMOXONE 360 PRO.

Glyphosate is not registered for pre-harvest weed control in malting barley. However, some glyphosate products are registered for pre-harvest weed control in wheat, feed or food grade barley, canola, chickpeas, lentils, faba beans and field peas. A 7-day harvest withholding period applies to pulse crops treated with either GRAMOXONE 360 PRO or glyphosate. A 7-day harvest withholding period also applies for feed/food grade barley treated with glyphosate, whilst a 5-day withholding period applies for canola and wheat crops treated with glyphosate. Consideration for resistance management is important, as is the delayed speed of brown-out compared with REGLONE® and GRAMOXONE 360 PRO if harvest urgency is a factor.

REGLONE is registered for use in all the above crops. It is registered for pre-harvest desiccation of canola and pulse crops and for pre-harvest general weed control in winter cereals. A harvest withholding period of zero to four days applies, depending on the crop. Always check the label for registered application rates and withholding periods.

Canola desiccation is a good option on lighter crops, where windrows may be blown about by strong winds. Ideal REGLONE spray timing in canola is when 70 per cent of the canola pods are yellow and the seeds are brown/bluish in colour and pliable.

For canola crops that are leaning over, the seeds on the upper side of the stem will mature ahead of those shaded from the sunlight. In this situation, spray REGLONE when all the seed in the exposed pods have turned reddish brown to dark brown.

For all crops, a wetting agent such as AGRAL® or BS1000 should be added. Spray coverage is critical, so use application techniques that ensure good coverage and spray penetration as far into the canopy as possible. Higher water rates and larger spray droplet sizes will help, as too will application at dusk or early evening to maximise the limited amount of translocation that can occur.

While the primary purpose of using REGLONE is to desiccate the crop and improve harvestability, there will also be positive outcomes on weed seed set control (depending on the weed growth stage at time of application).

With strong demand anticipated, be sure to get in early to secure volumes of REGLONE for harvest desiccation this season.

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