The Data Reporting Guideline (DRG) for Specialty Applications, Series 171-4, gives guidance to pesticide registrants on formats for study reports so that the Agency can review them efficiently. This guidance clarifies sections in the existing Pesticides Assessment Guidelines, Subdivision O, on data reporting. It provides an outline for the study report, describes the topics which should be addressed and provides guidance on data presentation. This DRG actually contains formats for three study reports: (1) Classification of seed treatments and treatment of crops grown for seed use only as non-food or food uses; (2) Magnitude of the residue: post-harvest fumigation of crops and processed food and feeds; (3) Magnitude of the residue: post-harvest treatment (except fumigation of crops and processed foods and feeds). 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. This DRG 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.