WHO Generic risk assessment model for insecticides used for larviciding and mollusciciding

31 Dec 2018

Generic risk assessment model for insecticides used for larviciding and mollusciciding.


The purpose of this document is to provide a generic model that can be used for risk assessment of larviciding and mollusciciding; it aims to harmonize the risk assessment of such pesticides for public health use. The assessment considers both adults and children (all age groups) as well as people in the following specific categories:

  • those handling products and preparing/loading the spray liquid in application equipment;
  • those applying the spray or other formulations; and
  • residents who may come into contact with treated waters during washing, bathing, fishing or any other activity, or use the treated waters.

Assessments of human health risk should consider the use of larvicides and molluscicides in potable water. Aspects of ecological risk must also be assessed because of the direct application of the products into the aquatic environments – and in this case, risk assessment should also characterize the risk to populations of non-target organisms.

The structure of this document follows that of A generic risk assessment model for insecticide-treated nets (WHO, 2018b). Because risk assessment is a constantly evolving process, guidance is also subject to change. Readers are therefore advised to consider any newer guidance published by WHO and other authoritative sources.

Access the document here.

Implementation WHO