White patches on tomato leaves?
On 22/04/2015 14:28, Gary Woods wrote:
stuart noble wrote:
I have seedlings that went white a day after putting them outside in a
cold frame.
Sunscald; put them out with some partial shade for a few days as they get
acclimated to _real_ sunlight.
At one point I got a light meter to determine what my artificial lights
were doing. It was shocking to see the difference between outdoor
sunlight, sunlight in a double-wall polycarbonate greenhouse, and
fluorescent grow lights!
Good tip. Many thanks
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