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White spots on Lobelia Cascade leaves - disease?

msqingxiaomsqingxiao North LondonPosts: 408
I grew some Lobelia Cascade from seeds, and it's been good until I moved them outdoors. Some white spots appeared on the leaves. Wonder what disease it is and if there's anything I can do about it please? Thanks!



Posts

  • Pete.8Pete.8 Billericay, EssexPosts: 9,861
    Looks like sunburn to me.
    If they've been inside for most of their lives and then put out and hit by strong sunshine, the leaves haven't had time to adapt to the strong sunlight, so they got sunburn - just like we would.
    They will adapt, but maybe somewhere with a little shade for a few days to get them used to being outside
    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • msqingxiaomsqingxiao North LondonPosts: 408
    Pete.8 said:
    Looks like sunburn to me.
    If they've been inside for most of their lives and then put out and hit by strong sunshine, the leaves haven't had time to adapt to the strong sunlight, so they got sunburn - just like we would.
    They will adapt, but maybe somewhere with a little shade for a few days to get them used to being outside
    Thanks a lot Pete! That'll explain it as I left them on a south facing patio... Will bring them to a more shady area then.  :)
  • Pete.8Pete.8 Billericay, EssexPosts: 9,861
    Good idea - they'll harden-off in a few days and then be able to enjoy the full sun 😎
    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • JennyJJennyJ DoncasterPosts: 7,686
    Have they been watered from overhead? It looks to me like damage from sun being magnified by drops of water sitting on the leaves. Try to water the compost not the leaves - it helps to take the rose off the watering can.
  • msqingxiaomsqingxiao North LondonPosts: 408
    JennyJ said:
    Have they been watered from overhead? It looks to me like damage from sun being magnified by drops of water sitting on the leaves. Try to water the compost not the leaves - it helps to take the rose off the watering can.
    Yes you are spot on too  :p I've been showering them... Will be more careful when watering going forward. Thanks for the great advice!
  • Pete.8Pete.8 Billericay, EssexPosts: 9,861
    It's a bit of a myth as far as water droplets causing burns on plants. They don't.
    They get sprinkled with water when a rain shower occurs on a sunny day and don't get burned.

    A water droplet on a leaf cannot focus light to cause burns. It would have to hover above the leaf to focus the light in order to cause a burn, but Jenny's advice is sound - best not to water leaves as it can encourage fungi.
    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • JennyJJennyJ DoncasterPosts: 7,686
    Must be coincidence that I've had brown patches appearing on newly-put-outside bedding plants after the helpful undergardener has watered them from overhead in the sun then :) . Established hardened-off plants or the hardy stuff that grows outside is unaffected, I agree. But whatever, there's an added benefit that less water is needed if it's directed into the compost/soil and not onto leaves where it evaporates or runs off onto the ground.
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