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Heatwave and sprays

ellehoo06ellehoo06 Posts: 5
in The potting shed
It may seem obvious but please learn from my mistake. I (used to) store my bug and rust sprays in my potting shed. Without paying too much attention I sprayed my roses for rust and within a couple of days 2 of them died back severely. With my Sherlock Holmes head on I worked out that the sprays were so hot from this heatwave that I had boiled the leaves. Fortunately after cutting them back I am getting new growth. Make sure you store all your chemical aids in a cool dark place. Happy gardening. Helen

Posts

  • ObelixxObelixx Posts: 30,090
    Or just not use sprays?

    If you remove all the old, affected leaves and destroy them - black bin rather than green or compost heap - you'll break the cycle of spores hanging around from one season to infect new growth next spring.   https://www.rhs.org.uk/advice/profile?pid=269 
    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • steephillsteephill Posts: 2,841
    The highest temperatures we have had recently were around 36C which is a long way from boiling. If the sprays were that hot surely you would have noticed when you picked them up?
  • ellehoo06ellehoo06 Posts: 5
    The heat was held in the liquid and as I pick the sprays up from the top I didn't notice. And when I say boiled it was meant figuratively. The spray was hot enough to kill the leaves. Thanks for being so picky. 
  • ellehoo06ellehoo06 Posts: 5
    Cheers Obelixx. I will do my best to keep on top of all the new growth. 
  • Pete.8Pete.8 Posts: 11,340
    Once the spray leaves the nozzle the fine mist cools almost instantly.
    Try it - fill your sprayer with hot (but definitely NOT boiling water, as the plastic will distort and you could burn yourself) and spray it on your hand from 6-12" - it won't feel hot

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • ellehoo06ellehoo06 Posts: 5
    Thanks Pete. I take your point but it is too much of a coincidence. I spray and the leaves die. Following manufacturer instructions to drench the leaves surely means that a fair bit of very warm (not boiling as I have been corrected) liquid ends up on the plant. It was just a post to help people show a little caution about storage. 
  • LiriodendronLiriodendron Posts: 8,328
    If the leaves were sprayed with anything (including plain water) when the hot sun was shining on them, this could cause severe damage and may be what you've seen happen, @ellehoo06.  Whatever the cause, I hope your roses recover...
    Since 2019 I've lived in east Clare, in the west of Ireland.
  • ellehoo06ellehoo06 Posts: 5
    They are coming back strong now. Hopefully get another flowering soon. 
  • LiriodendronLiriodendron Posts: 8,328
     :) 
    Since 2019 I've lived in east Clare, in the west of Ireland.
  • LoxleyLoxley Posts: 5,698
    Agree with Liriodendron, it's important not to mist or spray in hot sunny weather.
    "What is hateful to you, do not do to your neighbour". 
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