The Valencian Institute of Agricultural Research, in its Notice Bulletin No. 8 May 2017, explains in detail the:

a) Maximum residue limits for the recommended products
in citrus fruits (expressed in ppm.), listed alphabetically, for
the main destination markets.
Specifically from the European Union, Switzerland, and the United States of
America and Canada.

b) List of recommended products for each of the pests
of citrus fruits, compiled from the list made by the
Spanish Working Group on Citrus Pests.

The Bulletin can be downloaded from the IVIA website:

http://gipcitricos.ivia.es/boletin-avisos-no-8-mayo-2016.html