The Data Reporting Guideline (DRG) for Nature of the Residue: Plants, Series 171-4 (a)(1)&(2), gives guidance to pesticide registrants on the format for their study report so that the Agency can review it efficiently. This guidance clarifies sections in the existing Pesticides Assessment Guidelines, Subdivision O, on data reporting. It provides an outline for the study report and describes the topics which should be addressed such as application of radiolabeled materials, identification of residue components, degradation pathways, validation of enforcement methodology, etc. and provides guidance on the presentation of the results of the study. Data submitters can use the DRG in preparing their reports for submission to EPA to meet 40 CFR 158 requirements for the registration of pesticides. The DRG for Series 171-4 (a)(1)&(2), Nature of the Residue: Plants is only one of a number of DRG's published by the National Technical Information Service as an addendum to Subdivision O of the Pesticide Assessment Guidelines.