I use a 330 gallon tote as my rain barrel and the water flows out of the fitting at the bottom into a hose. I have a piece of vinyl screening covering the opening at the top where the rainspout enters the tote. Mosquitoes are excluded this way so I do not do any other mosquito control.
I have never had problems using this water either but then again I would never do any foliar watering either since I feel that wet leaves provide a breeding ground for disease.
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