Although rare it’s concerning. Another IMI resistant brome. Left to right Intervix 750, 1L, Onduty 50, 80g. All with 1% Hasten. Origin = central Eyre Peninsula, SA.

Herbicide resistance Quick test update. As weeds become reproductive they don’t recover well so testing becomes difficult. At this stage it’s better to send us seeds & also take advantage of choosing one of our pre-emergence bundles for ryegrass.

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Salvation Jane/ Patterson’s Curse resistant to 2,4-D. Left (Hillston, NSW) middle (Griffith, NSW), & right our susceptible). Both resistant biotypes from the same region.

Often increasing the rate of clethodim on ryegrass with weak DIM-resistance is effective. In this case it is not. Clethodim 500ml/ha + Factor 180g/ha was however effective. Shows the benefit of resistance testing. @WeedSmartAU

2/2 ... herbicides are affected by cooler weather, and its not even cold yet!!! Our observations suggest the cooler it gets, the slower DIMs work which may lead to reduced activity too? It dosent have to be frosty only, cool-cold conditions reduce activity too.

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DIM vs Glyphosate speed of action. We have assessed lots of pots in the past few months. Under warmer conditions DIMs faster acting than Glyphosate. Under cooler conditions (autumn in Adelaide) Glyphosate activity much faster than DIMs. This shows how much DIM...... (1 of 2)

I assessed this ryegrass yesterday and thought I would share. It has survived very high rates of DIMs. Sprayed under ideal conditions. I wouldn't expect any effect in the field with DIM chemistry. @WeedSmartAU

Creeping glyphosate resistance. This individual has clearly survived 4L/ha of a quality Glyphosate 540 product. Cross-pollination of weak resistance survivors over time creates strong resistance. @WeedSmartAU

With temperatures cooling down (finally!!) pre-em testing underway. No guessing which pre-em this is! Overwatch doing a great job on 2024 season ryegrass. ⁦@FMCANZ⁩

It as a challenge but we finally are able to accurately test for IMI tolerance in Faba beans. See https://t.co/DwzCC7PA7L for more details.

Apart from IMI testing, we have optimised detection of metribuzin resistance in lentils. See https://t.co/DwzCC7PA7L for more details.

Pre-em testing of ryegrass starting today due to the expected cooling from this coming weekend. 100’s of samples received prior to Jan 1 will be sprayed this week.

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Testing with farmer brews on ryegrass this summer to better understand herbicide performance on stressed ryegrass. Sprayed on hot summer day. Example of stress on Biffo 3.75L + Terrad'or 40g @ 1 week after spraying. More results soon. @GRDCSouth @WeedSmartAU

News on new Bayer herbicide Icafolin. Controls very many weed species pre AND post em. Excellent paper shows MOA is tubulin inhibitor, similar but not exactly as for old pre em trifluralin etc type herbicides. No mention of crop selectivity (yet). Looks promising.

Paraquat is an essential tool to control glyphosate resistant ryegrass. There are no other reliable options to control prior to sowing crops. The addition of Group 14 (G) herbicides is rarely useful to control glyphosate resistant plants.@WeedSmartAU @SyngentaANZ

Another IMI resistant brome from SA confirmed. The IMI technology has been & continues to be amazing for brome, barleygrass & wild oat control. There’s still virtually no resistance in these grasses. Left: susceptible brome, Right resistant.

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Fenceline webinar highlights: - Mix & Rotate: move away from glyph! Treat Paraquat with care (resistance & operator safety) + use alternate knockdowns. - Use a residual to reduce numbers + spray small weeds in early winter. - Sow to the fence + bale, still an excellent strategy.

Check out the full program for WeedSmart Week 2024! Featuring panel speakers, grower experiences, farm tours and a machinery expo, this event is not to be missed ✨ 📆 Held in Port Lincoln, SA, July 29-30 - Early Bird tickets available until June 28 ➡️ https://t.co/R3LDXBBBHk

Ryegrass Seedlings from paddocks arriving for Quick- Testing. Feedback will be quicker than some seed tests that arrived last year & are still dormant.

After 40 years it’s time to upgrade our spray booth, built by Steve Powles in 1984. As we were turning it off for the last time the light switch broke today. Thanks to GRDC for funding a replacement. It’s been dismantled next week. ⁦@SBPowles⁩ ⁦@GRDCSouth⁩

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