I know some of you have little use for chemicals, but I want to share something I just learned with other novice chemical users.
Not too long ago I carefully measured out a gallon of water, and the proper amount of captan to make up a gallon of fungicide for spraying on cuttings. (Took all the necessary precautions).
What I just learned today is the half life (time it is effective) of captan in water is 2.5 days. Malathion is shorter, just 1 day.
Not knowing this, I have sprayed a lot of useless chemicals in the past few years. Not using a lot of spray at any one time, I would save the extra in carefully capped bottles, and use it the next time. Boy do I feel sheepish.
Here is a web page that contains the half life of some selected chemicals;
So I guess the lesson is that being frugal does not always work.
Hardiness Zone 6a
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