Fri May 19, 2017 11:33 pm
Sat May 20, 2017 12:32 am
Sat May 20, 2017 3:59 am
Sat May 20, 2017 4:35 am
Sat May 20, 2017 5:33 am
Lindsaylew82 wrote:I do agree it's sunscald. I don't agree that droplets of water can cause it. Otherwise morning dew would scald every plant!I'm calling old wives tale on that theory! Watering from the top CAN cause issues with fungus, though.
You can prevent that little sunburn with proper hardening off. They will out grow it, now. I don't think there's any further need for protection.
Sat May 20, 2017 6:27 am
Sat May 20, 2017 8:45 am
Sat May 20, 2017 11:01 am
Sat May 20, 2017 4:52 pm
Lindsaylew82 wrote:False! The only way that water droplets can cause burn is if they're not actually touching the surface of the leaves. Drops that are intact with the surface can't burn because the water has a cooling effect. Light can't focus on the leaf because there's no distance to focus the intensity.
Those wet leaves can't cause burn like that.
Look at the results section of this experiment:
http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2009.03150.x/full
Now, if a plant is hairy, and water droplets may float on those hairs, then burn may occur because of the focusing distance and the inability for the water to have contact cooling effect.
Sat May 20, 2017 4:57 pm
Maxy24 wrote:Thank you all, glad to know it's not some horrible disease or pest. I've never been able to avoid getting my leaves wet, I just water with a hose and spray attachment, I will try to be more deliberate about where I point it.