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Ctgb releases significant update of fate and behaviour in water evaluation manual

The Board for the Authorisation of Plant Protection Products and Biocides in the Netherlands (Ctgb) has released a significant update of their fate and behaviour in water evaluation manual (NL part).  In the previous version, the starting point for assessment of spray drift in field crops (downward spraying) was the obligatory use of 50% drift reducing nozzles in the last 14 m of the field in combination with a maximum sprayer boom height of 0.5 m above crop canopy and use of an end nozzle to prevent overspray.  The drift emission for this situation was 1.0%.  Use of 75% or 90% drift reducing nozzles could further be requested by the applicant.  In the updated evaluation manual (version 2.1) the following changes are implemented:

  • for field crops, drift reducing nozzles are replaced with drift reducing technology (DRT) classes
  • requirement for the use of a minimum DRT of 75% on the whole field has been added (drift emission of 0.5%)
  • the procedure and conditions for the use of 95% DRT are added.

These changes are expected to enter into force in January 2017.

Furthermore, the updated evaluation manual now makes a clear division between the assessment procedure for field uses and protected crop uses.  Detailed guidance for assessment of edge-of-field ditch and drinking water abstraction points for protected crop uses has been added.

For advice on risk assessment and further information on the registration of plant protection products, biocides or general chemicals, or any other regulatory issues, please contact JSC on +44 (0)1423 520245,

Published 6th December 2016
Categories Agrochemicals, Articles
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