I made a mix of 1:8oz neem oil: water solution to treat some indoor plants against insects occassionally. I wonder how long, if at all, this solution can be stored and remain effective? It's in a sealed bucket stored indoors and I'm thinking I can mix it well before use and simply continue to use it as long as it lasts, but I wasn't able to find info on whether or not the solution will loose its effectiveness being stored like this over time (and if so, over what timespan).
I'm new to this substance, and have only used it once so far, after finding out it's a great solution to my current black cherry aphid (aka cherry blackfly) problem, but all of the information I have found so far says to make a fresh batch each time, and use within a few hours.
Here'a quote from www.discoverneem.com:
Use your neem insect spray as quickly as possible, definitely within eight hours. Once mixed with water the neem oil starts breaking down. Always make a fresh batch for spraying, and only prepare the amount you need.