CROP PROTECTION
Herbicides Versatill PowerFlo
Vigilant II
600G/L CLOPYRALID
43G/KG PICLORAM 4.3G/KG AMINOPYRALID
• Versatill PowerFlo is a systemic, selective herbicide. It is absorbed through both foliage and roots and moves readily throughout the plant, immediately arresting growth and resulting in rapid twisting of foliage, followed by plant death and breakdown.
• Ready to use product for the treatment of freshly cut stems on woody and perennial weeds. • Convenient ready to use formulation. • No mixing required. 240g: 119252 5L: 192187
1L: 157772 5L: 157773 10L: 158406
Vixen
WeedEnz Organic Concentrate
200G/L GLUFOSINATE AMMONIUM 20G/L OXYFLUORFEN
490G/L FATTY ACIDS 200G/L PINE OIL
• A unique fast-acting combination knockdown herbicide for use in vineyards and orchards. • Vixen provides broad spectrum weed control with fast knockdown and reliable kill. • The convenient liquid formulation includes a wetter system.
• A blend of ingredients derived from natural plant and pine oils. • Rapid knockdown activity desiccates and kills a range of annual weeds and grasses. • Repeat spraying can kill larger perennial weeds. • 200L also available – talk to store staff.
5L: 159011 20L: 141950 100L: 141949
1L: 115434 5L: 115435 20L: 115437
No. 4472
* Product registered with BioGro.
Glyphosate resistance? Glyphosate was originally discovered by Swiss chemist Henri Martin in 1950 but it was not until 1970 that another scientist, John Franz, synthesised the molecule “glyphosate”. This was then patented by Monsanto as the active ingredient for the herbicide Roundup®. Prior to the introduction of Roundup to the market, Paraquat, Amitrole and cultivation were the main weed control options for horticulturalists. Roundup offered growers a broad spectrum perennial herbicide, which had a much safer environmental and user toxicity than those being used at the time. However, the cost of the brand Roundup remained relatively expensive, so many growers continued to use a mix of herbicide options in their programmes. When Monsanto’s glyphosate patent expired in 2000 and many generic suppliers came to the market, the price plummeted, turning this highly effective but expensive product into the cheapest broad spectrum option for horticultural use. Its cheapness is one of the main factors that has contributed to its downfall – the development of resistance. Glyphosate is now the most widely used herbicide on the planet. In recent times, glyphosate has given effective control with a low cost per hectare and many growers have just used glyphosate and glyphosate mixes with application rate spikes designed to increase control. Often little alternative chemistry is being used during the season, or from year to year. If we are to keep this chemistry working for us in the future, we must now introduce a sustainable resistance
Glyphosate 360 at 9.0L/ha (30 days post application). Good control of other weed species but resistant ryegrass is left to re-populate the herbicide strip.
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management programme, just like those used for other pesticides. There are two main points that must be considered if we are going to keep glyphosate in our programmes: Rate per hectare: Under-dosing is a leading cause of resistance development. Often an application rate is selected that kills many of the weeds present but some individual weeds survive and grow back. They are then re-treated with a sub-lethal dose of the same chemical. When deciding on the correct application rate per hectare, it is critical that all of the species in the area being treated are identified. The application rate chosen must provide complete control of the hardest to kill weed. In the photographs, glyphosate resistant ryegrass was identified so Vixen (glufosinate + oxyfluorfen) was chosen. At 4.0L/ha the Vixen was ineffective at controlling this species, however at 6.0L/ha it was controlled. Mixing up chemistry: All growers, regardless of whether resistance has been identified or not, should be implementing a programme of mixing herbicide groups throughout the year. The options will vary depending on the crops and the weed species present. Farmlands Technical Advisors are trained to assist growers with a planned approach to using a mix of chemistry to control all weed species in an economical and sustainable manner. Article supplied by Farmlands Horticulture.
Vixen 4.0 L/ha (86 days after application).
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Vixen 6.0 L/ha (86 days after application).
Farmlands Horticulture PRODUCTGUIDE
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