Adjuvants for plant protection products

Adjuvants are products (mixtures or preparations) which are added to be mixed with a plant protection product by the professional user. They enhance the effectiveness or improve other pesticidal properties of a plant protection product.


Some examples of adjuvants are:

  • Wetting agents:
    These are products aiming at improving the efficacy of plant protection products by improval of spreading and adherence to crops.
  • Stickers:
    These are products aiming at enabling better adherence of products for seed treatment and at preventing important dust formation during sowing.
  • Anti-foaming agents:
    These are products aiming to prevent excessive foam formation, e.g. when several formulations are used together.

An adjuvant has to have an authorisation before it can be placed on the market. Adjuvant authorisations are granted, in anticipation of  European regulation, for an indefinite period.

The legal basis: article 58.2 of the PPPR 1107/2009

The legal basis of the assessment has not been finalised on EU level, therefore the Member States may apply national provisions for authorization of adjuvants until the adoption of detailed rules at EU level as foreseen in article 58.2 of the Regulation. In the Netherlands the national provisions are regulated in RGB, article 11.10b.


In common we only check if the adjuvant contains:

  • co-formulants which are included in Annex III of the Regulation 1107/2009 (unacceptable co-formulanten).
  • safeners
  • synergists

If the adjuvant contains this substance(s), we cannot authorized the product (for the authorisation of safeners and synergists the same authorisation process as for active substances must be followed).

The risks

Because we check only the above mentioned items, the  risks for humans, animals and the environment are not fully assessed. So the decision and the legal conditions for use must report that the legal conditions for use, the instructions for use and the labelling have not been assessed by the Ctgb. It is the responsibility of the authorisation holder to cover the possible risks.

Registration process

For this kind of applications a notification before submission, which is obligated for a number of other applications, is not necessary. Also there is no separate intake process  for this type of applications.

The procedure takes three months. We start after receiving the application from and our invoice is paid.


After finishing the application we send you the decision by regular mail. In case you do not agree with the decision please refer to Objection and Appeal.

Instruction for submission

For information about sending the forms, payment method and language; see Directions for submission. More information about this kind of applications can be found  under Administrative and minor applications. This information is also available in Dutch.


For this kind of applications you have to pay application fees.