Paraquat Stephen Salter Andre de Bruin Mike Parker Crop # - - PowerPoint PPT Presentation

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Paraquat Stephen Salter Andre de Bruin Mike Parker Crop # - - PowerPoint PPT Presentation

Dec 13, 2023 180 likes •563 views

Paraquat Stephen Salter Andre de Bruin Mike Parker Crop # growers Land area (ha) Value ($m) # employed #employed in directly packhouses Beans & Peas 467 9,750 $159 75 800 Brassicas 125 2,800 $83 473 91 Celery 17 150 $9

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Paraquat

Stephen Salter Andre de Bruin Mike Parker

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Crop # growers Land area (ha) Value ($m) # employed directly #employed in packhouses Beans & Peas 467 9,750 $159 75 800 Brassicas 125 2,800 $83 473 91 Celery 17 150 $9 Unavailable Cherries 88 645 $93 5,500 Kumara 48 1,600 $50 545 100 Lettuce 100 1,350 $43 282 132 Melons 20 273 $29 Unavailable Onions 95 5,235 $136 Unavailable Silverbeet/Spinach 15 200 $12 Unavailable Squash 25 6,526 $62 345 65 Sweetcorn 180 3,871 $73 160 540 TOTAL 1180 32,400 $749 Total employed: 9,100+

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Our information

  • How it was obtained
  • Sections 5 and 6 of the Act
  • Unique properties of paraquat - benefits
  • Why it is critical that it remains available
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Human Health

1 2 3 4 5 6 7 8 9 10 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

Mean Nnumber of calls/year Middle year of average

3 year rolling average of calls received by the NZ National Poisions Centre

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Risk to Birds

  • Birds flee when spraying occurs
  • Strong concerns regarding model accuracy and validity
  • “Even when the crop is unpalatable, it is assumed that weeds and weed seeds will

be available as food for birds and mammals” – pg 26 EFSA Guidance

  • Insecticides and Fungicides ?

Fast-acting herbicides X

  • Re-application -> Timing means seeds often unavailable for exposure
  • Translocation? Doesn’t appear to be accounted for
  • LD50s for species with similar diets to model scenarios should be used
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600g/ai/ha/yr

  • Flexibility = good
  • Doesn’t allow for many of the use patterns reported by growers
  • Brassicas (810)
  • Cherries (2160)
  • Kumara (potentially 2000)
  • Lettuce (810)
  • Onions (810)
  • Spinach/Silverbeet (810)
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Other Controls

  • Buffer Zones – Droplet sizes
  • Responsible Handling Information
  • Permissions for Biosecurity use
  • Timing of application restrictions
  • Should be 24 months and match label requirements
  • Labelling Notice
  • Poisons Centre Data
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The continued use of paraquat in vegetable production. Kumara case study

Andre de Bruin

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Welcome to our place

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AJ & KL De Bruin ltd.

Growers who Care

Our Mission is to To produce a consistently high standard of quality produce. To use sustainable, safe, best practice techniques, ensuring positive outcomes for our produce our people and our land.

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The kumara industry is based in the Delta of the Northern Wairoa river

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A Snapshot of the Kumara Industry in Kaipara

  • Kumara Industry has huge cultural as well as economic importance to the

Kaipara and wider Northland region.

  • Between 80 to 90% of New Zealand’s kumara is grown on the alluvial flats

surrounding Ruawai and Dargaville.

  • The Industry covers about 2000 ha of which about 1200 ha is cultivated in any
  • ne year
  • Over 200 full time people & a further 1000 seasonal workers, the majority are

northland locals.

  • Returned over $50 million per year (Last 4 years average) to the district.

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Kumara planting

  • Very different to potato

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Weed strike

  • 7 days after 15mm of rain

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You cannot successfully mechanically In row weed

Good spray coverage is essential. Coarse nozzles will reduce effectiveness

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When you get it wrong! Hand weeding will not save you

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Rain events

  • 1. Trigger mass

weed strikes.

  • 2. Require further

weed control.

  • 3. Cannot

mechanical weed.

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Last run of the morning

  • Spraying paraquat (Gramoxone). Finished for the day just on 7am

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Kumara field mid season

No Paraquat is used on Kumara after canopy runs

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Biological controls are a big part of our weed control programme

Hand weeding Green crops Long and short rotations with pasture/cattle and sheep

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Harvesting – Canopy removal mulcher

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Summary

  • 1. Only spray when required - Over spraying reduces yield.
  • 2. Must be able to repeat spray.
  • 3. No bird issues.
  • 4. No re-entry or bystander issues.
  • 5. PPE is standard when using paraquat.
  • 6. Some limited hand gun spraying is used for very specific

situations e.g. under covers - no residue issues.

  • 7. Operate under Growsafe and NZ Gap.
  • 8. Professional growers.

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Thank you for visiting our place

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AJ & KL De Bruin ltd.

Growers who Care

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The essential use of Paraquat

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Mike Parker (Vice Chair and Director: Stalks, Vines, Herbs & Bulbs) Parker’s Gardens Hamilton

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Farm Features

  • Home bock 15ha.
  • Flat to very gentle rolling.
  • Maize, sweetcorn, watermelon, rockmelon, some

livestock.

  • Two soil types –Horitou silt loam and clay loam.
  • Annual rainfall -1125mm.
  • Irrigation limited to Horticulture only and generally only in

January/February.

  • Additional leased land. (same contour and soil type)

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A mixed enterprise – Horticulture

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Arable - Maize

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Winter livestock

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Paraquat use

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Paraquat use

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Paraquat use

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Paraquat use

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Crop boundaries – resistance management

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Resistance management

  • Alternate groups D (paraquat), G

(glyphosate – tolerance to mallows and nettles), H (glufosinate – kills clovers) every 4-5 applications. Only 3 chemicals with broad spectrum knockdown and Paraquat only one not translocated and therefore ideal for inter-row uses where crop exists.

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Birds

  • Application machinery is noisy and paraquat

formulations dry very rapidly (within 5 minutes) and therefore the likelihood of poisoning birds is extremely remote.

  • In 40 years of applying paraquat formulations I

have never seen birds enter the paddock while spraying was in progress

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Since Dec. 2017 stringent requirements for certified handlers of classes 6.1A and B

  • Worksafe Reg 4.3 – “ a certified handler must

know and be able to describe the hazard classifications, properties, and adverse effects etc”

  • Must also have a std Growsafe certificate,

inventory, emergency response plan, SDSheets, PPE fit for purpose, tracking etc.

  • Above CH requirements should be sufficient

without further controls, especially if audited and under NZGAP.

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Application

  • Closed cabs should not be necessary –booms well behind and full PPE
  • requirement. Note mixing requires PPE.
  • Closed mixing and loading systems should not be mandatory. Note that in all

systems lids have to be removed and even in closed systems often measuring is required. In all cases PPE needs to be worn at this stage when the concentrate is being handled.

  • Knapsack or handheld should be permitted as PPE isolates the risk and also

dealing with small quantities (about 40mls )

  • Applications are made to small far more vulnerable weeds (less wax on

cuticles of leave and NOT in flower) and therefore bee’s not an issue. Generally spot spraying.

  • 600gms ai/ha would be acceptable for my growing operation, but per crop

season would make more sense than per year.

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Questions?