It is never advisable to store made up diluted concentrated product for more than a few days as they are designed to naturally break down and can deteriorate rapidly with the loss of efficacy. This restriction applies to all products that are diluted from concentrate. For safety and legal reasons we advise that made up solutions must never be left in unmarked sprayers or containers.
There are many ready to use products now available, which are specially formulated to remain stable as dilute solution. You may find this type of product more convenient, especially when treating small areas or individual plants.