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Proposals to Amend the New Zealand (Maximum Residue Limits of Agricultural Compounds) Food Standards 2007

6 Proposal to set an MRL for Pyraclostrobin

It is proposed that MRLs are set for pyraclostrobin when used as a fungicide for apples, pears, barley and wheat, and in animal products as a result of its use as a fungicide on barley, ryegrass and wheat for animal feed. It is proposed that Schedule One of the NZ (MRL) Food Standards 2007 be amended to include the following; this will be the resulting entry for pyraclostrobin in Schedule One of the NZ (MRL) Food Standards 2007:

Compound	CAS#	Residue definition	Food	Maximum Residue Limit (mg/kg)
Pyraclostrobin	175013-18-0	Plant commodities: Sum of: Pyraclostrobin and its desmethoxy metabolite Expressed as: Pyraclostrobin Animal commodities: Sum of: Pyraclostrobin and metabolites hydrolysed to: 1-(4-chloro-phenyl)-1H-pyrazol-3-ol Expressed as: pyraclostrobin	Apples Barley Mammalian fat Mammalian kidney Mammalian liver Mammalian meat Milk Pears Wheat	0.02* 0.02* 0.02* 0.02* 0.02* 0.02* 0.02* 0.02* 0.02*

NOTE: (*) indicates that the maximum residue limit has been set at or about the limit of analytical quantification.

Amendment Rationale

The proposed MRLs represent a range of new use patterns in New Zealand for the active ingredient pyraclostrobin. The proposed MRLs will manage the new use of pyraclostrobin as a fungicide on apples, pears, barley and wheat to the application rates and withholding periods that are approved good agricultural practice (GAP) in New Zealand. The MRLs are proposed at the limit of quantification to represent that no residues are expected in harvested commodities and in animal products, through treatment of feed, when this active is applied and used correctly.

Chemical Information

Common name of compound	Pyraclostrobin
Use of compound	Fungicide
Chemical Abstract Services (CAS) Registry number	175013-18-0
Type of compound	Strobilurin
Administration method	Spray

Good Agricultural Practice

Pyraclostrobin is proposed for use as a fungicide for apples, pears, wheat and barley.

Apples

Application may be up to 4 times throughout early-to-mid growing season at 7-10 day intervals at 6.3gai/ha. Application must not be after 100% petal fall.

Pears

Application may be up to 4 times throughout early to mid growing season at 7-10 day intervals at 6.3gai/ha. Application must not be after 50% petal fall.

Barley and Wheat

Application may be 2 times during mid-tillering up to the ear emergence with a 3-5 week interval at 250gai/ha with a withholding period of 56 days.

Residues Information

Residue data for apples and pears support a limit of quantification MRL of 0.02mg/kg when the last treatment is prior to 100% petal fall (apples) or 50% petal fall (pears). MRLs of 0.02mg/kg are therefore proposed to support GAP. Residue data for barley and wheat support a limit of quantification MRL of 0.02mg/kg when the last treatment is 56 days before harvest. MRLs of 0.02mg/kg are therefore proposed to support GAP.

Animal Transfer

Transfer of residues to animals following grazing of orchards has not been considered. It is acceptable that orchards treated to GAP should not be grazed. Transfer of residues to animals following grazing of barley, ryegrass and wheat feed, fodder and straw, has been assessed 42 days after treatment and it has been determined that no residues will be detectable in animal tissues and milk following grazing.

Dietary Risk Assessment

Acceptable Daily Intake (ADI)

0.03 mg/kg bw/day

The potential daily exposure via food (PDE_(food)) is used for dietary intake calculation where a value has been set. An appropriate acceptable daily intake (ADI) is used in the absence of a PDE_(food).

The chronic dietary exposure to pyraclostrobin is estimated by the National Estimated Dietary Intake (NEDI) calculation encompassing all registered uses of the chemical and food consumption data based upon the 1997 National Nutritional Survey for adults and the 1995 National Nutrition Survey of Australia, for children. The NEDI calculation is made in accordance with Guidelines for predicting dietary intake of pesticide residues (revised) [World Health Organisation, 1997].

The NEDI for pyraclostrobin is equivalent to 0.7% of the ADI. It is therefore concluded that the chronic dietary exposure is small and the risk is acceptable.

Toxicological / Public Health Assessment

It has been determined that the use of pyraclostrobin as a fungicide for use on apples, pears, barley and wheat, according to the GAP specified above, is very unlikely to pose any health risks from consumption of the harvested commodity and animal commodities from animals consuming treated barley, ryegrass and wheat.

International MRLs

To meet New Zealand’s obligations under the Agreement on the Application of Sanitary and Phytosanitary Measures the proposed MRLs will be notified to the World Trade Organization. Any country may choose to comment if they believe the proposed MRLs represent a barrier to their trade.