IFP and OFP Apple Trees (IMAGE) American Society for Horticultural Science Caption This photo shows IFP Apple trees in the foreground and far background, and OFP trees with kaolin clay treatment in the center. Credit Photo by Greg Peck Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.