Pesticide residue trial requirements

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Pesticide residue trial requirements

• Act No 36 of 1947
• Insecticide
• Fungicides
• Herbicides
• Plant Growth Regulants
• Defoliants

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Pesticide Residue Requirements

• Agricultural Remedies Residue Trial Data
  Requirements Document
• Available on or web page
• www.nda.agric.za/act36/main.htm
• The Above document outlines trial requirements
• Number of sites
• three sites- areas of intensive cultivation of
  the particular crop
• Climatic/geographic extremes considered

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B) Plot Size

• Size and number of samples determines the
  experimental plot size
• The ffg to be taken into account
• The sample can be collected in sufficient
  quantities at each sampling date
• Sampling does not affect crop growth
• Quantity of sample is sufficient to compensate
  for loss of material through damage

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C) Dosage Rates

• Rate at which is intended to be registered for
• Double the dosage rate if phytotoxic
• considerations permit this

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D) Number of Applications

• Maximum number within the normal period that is
  required to protect the crop
• Where only a single application is sufficient,
  care should be taken to apply at the correct time
• Only pesticides that will ensure healthy plants
  and that will not interfere with the analysis of
  the residues of the tested pesticide can be used.
• Control plot should receive the same treatment.

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Time of Sampling

• 1. Negligible residue expectedwithin 7 days a
  minimum of 3 intervals after the last treatment
• 2. More Persistent Chemicals minimum of four
  different intervals after the last application
• 3. Very Persistent Chemicals- minimum of 5
  different intervals

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Sampling Techniques

• Must be representative of the whole marketable
  crop
• The Untreated control must be sampled first
• Suitable packaging material used
• Freeze samples immediately

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SAMPLE Size

• Depends on the crop.
• Generally 5 kg for large fruit
• 2 Kg for small fruit

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Required Trials

• A new use active never registered to be used on
  the commodity
• Application made to edible portion or root for
  both systemic and non-systemic products-
• trials at 3 sites- 2 at the registered dosage
  rate and 1 at 2X rate. Full degradation pattern
• The same applies if the application is made to
  soil, seed, seedling prior to development of
  edible portion

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Required Trials

• Registered active but the formulation is new. WP,
  SC etc Withholding period longer than 14 days and
  application rate of ai the same
• Made Directly to edible portion- need the same
  number of trials but residue at end of official
  withholding period
• Made to soil, seed or seedling for both systemic
  and non systemic 3 trial as above
• Proof of non presence at commencement of
  development of edible portion

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• Similar formulation but the formulator has
  changed
• Application to edible portion 3 site trials
  residue at end of official withholding period
• Made to soil seed or seedling prior to
  development of edible portion Systemic as above
• Non systemic no data required

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