Registration application and label requirements in relation to spray drift management – supplement 1

Purpose

This notice is issued to supplement a previous notice entitled 'new registration application and label requirements in relation to spray drift management' that became effective 1 March 2010. This notice provides additional information in relation to the APVMA’s spray drift risk management and does NOT negate any information or requirements in the previous notice from 1 March 2010.

Note that the APVMA may provide additional information or require additional changes in future notices as new scientific information becomes available.

Date of effect of this operational notice: 17 November 2010

Part A – New spray drift related application requirements

1. Alteration to label restraint statement for required spray droplet size when using it with products that are applied with both broadacre boom spray equipment and orchard airblast spray equipment

High-speed air passing over nozzles in orchard airblast equipment shatters larger droplets into smaller sizes. Installing nozzles that produce larger droplets will therefore not result in these types of machines producing larger droplet size categories. A label restraint requiring larger droplet categories could not apply effectively to such machines. The APVMA already uses separate spray drift data sets created specifically for typical radial orchard airblast equipment that generally produce a Very Fine to Fine range of droplet sizes.

The usual label restraint mandating a particular droplet size category applies to ground application and aerial application boom spray equipment where correct nozzle choice is able to provide the required spray droplet size category. (Special approaches used on aerial booms are not readily transferable to radial airblast designs, and frequently orchardists need to use smaller droplet sizes for the application of certain fungicides and insecticides.)

Therefore, for those products that will have labels that provide for both broadacre boom spraying and for orchard airblast applications and also that require droplet size categories of Medium or larger, the following phrase should appear at the beginning of the spray drift label restraint for droplet size3—'Except when applying with orchard airblast equipment'.

Two example statements are provided below.

Except when applying with orchard airblast equipment, DO NOT apply with spray droplets smaller than a COARSE spray droplet size category according to 'APVMA Compliance Instructions for Mandatory COARSE or Larger Droplet Size Categories' located under this title in the GENERAL INSTRUCTIONS section of this label.

Except when applying with orchard airblast equipmentDO NOT apply with spray droplets smaller than a MEDIUM spray droplet size category according to nozzle manufacturer specifications that refer to the ASAE S572 Standard or the BCPC Guideline.

Part B – Additional information related to spray drift regulation

1. Changes to APVMA standard scenarios for spray drift risk assessment

New scenarios added 

Agricultural aerial fixed-wing ULV oil applications Very fine
Agricultural aerial fixed-wing–large and average applications Very fine and very coarse
Agricultural aerial helicopter  Very coarse and extremely coarse
Forestry aerial helicopter–herbicide, level terrain, 5m height Extremely coarse
Forestry aerial helicopter–herbicide, level terrain, 15m height    Extremely coarse
Forestry aerial helicopter–herbicide, sloping terrain, 15m height Extremely coarse
Forestry aerial fixed wing–bananas   Fine and medium

Previous scenario deleted

Orchard airblast – 'normal orchard'

This scenario has been re-examined and determined to be misnamed. The designation 'normal orchard” originally assigned by the US Spray Drift Task Force is inappropriate because this spray drift deposition set is based on a major component of vineyard data making it not appropriate for risk assessment of orchard applications.  It will not be used and has been deleted from the APVMA’s group of standard scenarios. A separate set specifically for vineyards remains for vineyard assessment.

For spray drift risk assessment of orchards, the APVMA will use, 'composite orchard', 'dense orchard' or 'sparse orchard' depending on the particular situation.

2.  Accepted versions of AgDRIFT and AGDISP

Current standard scenarios for ground application have been taken from Tier 1 AgDRIFT v2.0.05 and v2.0.07 and for aerial applications from AGDISP v8.15.

The APVMA will not adopt and use later versions of these sources unless it has first verified that changes in each newer version do not compromise the validity of the output deposition data as judged by the APVMA.

3.  Maximum label no-spray zones

The APVMA’s spray drift deposition data sources provide validated spray drift deposition information to a downwind distance of approximately 300 metres for ground applications and 800 metres for aerial applications. These distances are the maximum that the APVMA will set on labels as no-spray zones.

For products and uses where spray drift risk assessment shows that no-spray zones greater than 300 metres for ground and 800 metres for aerial application would be necessary to meet acceptable risk thresholds, then the application cannot proceed as proposed. The applicant would need to provide the APVMA with an alternative application method (such as a larger required droplet size category or a mandatory type of drift reducing application equipment). With that new proposed approach, the application can then proceed through a second spray drift risk assessment.

To protect your privacy, please do not include contact information in your feedback. If you would like a response, please contact us.