maf, I don't think the temperature makes too much of a difference and since it doesn't seem to harm healthy plant growth as long as the concentration of the spray is kept below 7 or 8 % and not used in the heat of the day. Just remember 8 ounces of regular strength Clorox added to one full gallon of water. If you find a stronger or weaker version of bleach you will have to adjust accordingly. I did find using less than a 5% dilution did not have as much affect. I think the Sodium Hypochlorite concentration has to be high enough to stop the spore growth so if I were using it as a preventative I would add between 6 1/2 and 7 ounces to the water.
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