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You are probably wondering what IR-4 stands for. It means Interregional Project No.4 and it is funded by the U.S. Dept. of Agriculture and all of the state agricultural experiment stations. Its purpose is to obtain data to meet EPA requirements for registrations and tolerances on minor crops and specialty uses. The pesticide industry will sometimes conclude that the potential profit from some minor use is too small. When this is the case, IR-4 attempts to fill the data gaps. Since the states and USDA have only limited facilities for toxicity and environmental studies, IR-4 limits itself to those projects where the data gaps are efficacy and residue studies. In other words, IR-4 is limited to working on those pesticides where industry has already provided the toxicity and environmental studies.