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"Napthaleneacetic acid (NAA) has been used as a stop-drop spray for over 60 years, often with variable results. With such a long history, it is perhaps understandable that some of the advice learned from early studies with NAA has slipped from our consciousness. One such example is that water quality is an important factor to stop-drop success\u2026 or is it?  This article takes a look at what we knew, or perhaps once thought we knew about this topic. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://extension.psu.edu/plants/tree-fruit/news/2012/managing-the-effects-of-spray-water-quality-on-the-efficacy-of-naa-stop-drop-sprays2014things-we-used-to-know-but-forgot>