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Chief Executive initiated reassessment Organophosphate and Carbamate based insecticides

Chief Executive initiated reassessment Organophosphate and Carbamate based insecticides. New reassessments approach. Moving from single substance to group reassessments Older substances, often removed or restricted by other jurisdictions Engaging early – go out with early thinking Aim:

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Chief Executive initiated reassessment Organophosphate and Carbamate based insecticides

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  1. Chief Executive initiated reassessmentOrganophosphate and Carbamate based insecticides

  2. New reassessments approach • Moving from single substance to group reassessments • Older substances, often removed or restricted by other jurisdictions • Engaging early – go out with early thinking Aim: • Avoid perverse outcomes • Consistent controls to manage risk • Greater certainty about tools available for use in medium term • More efficient use of resources

  3. Consultation • Call for Information • To identify those that may have high risks • To obtain use information • Feasibility of possible controls or other controls to mitigate risk • Hui • Northland, Bay of Plenty, Rotorua and Marlborough

  4. Scope of the reassessment acephate maldisonpyrazophos carbarylcmethamidophosbenomylc chlorpyrifosmethomylccarbofuranc diazinon phoratecarbosulfanc dichlorvos pirimicarbcchlorpyrifos-methyl dimethoatepirimiphos-methyl dichlofenthion fenamiphosprothiofosethion fenitrothionoxamylcfamphur phoximterbufosisazofosomethoate c=carbamates

  5. HSNO • Process • May approve if the positive effects of the substance outweigh the adverse effects • If risks are negligible then the approvals should be retained • If additional controls make the risks negligible, then the approval should be retained with those additional controls. • If the risks are non-negligible even with extra controls a risk/benefit analysis is conducted and: • If benefits are greater than the risks the approval is recommended to be retained • If risks are greater than benefits the approval is recommended to be revoked either with or without a phase-out period

  6. Evaluation • Risk vs Benefit • Qualitative descriptors allow a risk or a benefit to be negligible, low, medium or high to focus comparisons • Likelihood and magnitude for risks and benefits Page 43 – 45 of the consultation report

  7. Example • Diazinon • widely used • high risks and high benefits • effective alternatives not yet available

  8. Analysis of risks • Risk is a function of exposure and hazard • Exposure estimated using models/measured data • Use patterns established from product label and stakeholder feedback • Hazard: Use threshold values derived by other regulators • Risks assessed with and without additional controls

  9. Analysis of risks • Operators • Re-entry workers • Bystanders • Aquatic environment • Birds • Bees

  10. Analysis of risks • Risk Quotient = Predicted exposure/threshold value • Target Risk Quotient is <1

  11. Risks - Qualitative Descriptors Human health Environment

  12. Benefits - Qualitative Descriptors

  13. Generic Benefits • Efficacy • Broad spectrum • Lower application rates • Cheaper • Short pre-harvest intervals • Short re-entry intervals • Maximum Residue Limits • Resistance management • Biosecurity

  14. Specific Benefits • Many OPCs are particularly effective in controlling specific pests. This makes them beneficial on a number of crops where these pests are difficult to control • Diazinon to control grass grub on pasture • Supports large industries = large contribution to GDP • Specific pest to NZ • No effective alternatives – ongoing research

  15. Approach to controls • AIM: Reduce risk levels to, or close to, negligible • Controls are risk reduction measures, intended to reduce exposure to human health / environment • Default controls (arising from hazardous properties – s77) • Additional controls (to manage risks not addressed by default controls, reflect parameters of scenarios – s77A) • Risks identified to the receptors identified in the risk assessment • Operators, re-entry workers, bystanders • Aquatic and terrestrial environment, birds, bees • Additional controls toolbox developed with stakeholders

  16. Controls toolbox

  17. Recommendations • Based on balance of risks and benefits • Controls selected to mitigate risks as far as possible

  18. Recommendations – Diazinon • Very high risks – but also very high benefits • Long phase-out period proposed to allow development of alternatives – plus additional controls e.g. • Maximum application rates • Semi-automated equipment for indoor application • No hand-held application of granules

  19. Key issues raised in submissions • Home garden uses • ADI/MRL relationship • Biosecurity uses • Information challenges/data gaps • UK COT

  20. Updated recommendations • Retain dimethoate • Retain outdoor uses of pirimiphos-methyl & methomyl • Biosecurity – Authorised Person-only control for fenamiphos after 5 years; Extend AP control to all OPCs we’re retaining • Extend phase-in period to 2 years • Change definition of automated application in greenhouses • Remove droplet size requirements for chlorpyrifos and diazinon • Allow shorter buffer zones through COP • New label warning for bee risks

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