My rhodos had a bit of rust and the only spray I had was lime sulphur so yes ive sprayed them with lime sulphur with a spray fix additive. Now Im having serious concerns as someone told me I should have never done that. Whats the worst outcome? Im afraid Ive now just gone and murdered them all :-(
bestie1,
Jul 19, 7:57am
Dont panic, Lime Sulphur won't kill your Rhodo's. especially as youve sprayed when the plants are basically dormant.
Rhododendron's don't like lime but that's a whole different kettle of fish to what you sprayed.
gabbysnana,
Jul 19, 8:35am
My rhodos are in full bloom?
nchun,
Jul 19, 8:35am
It depends on the dilution rate you used when mixing the LS. What was it? Worst outcome is you will burn all the foliage, but it won't kill the tree and should recover in spring. At least you will have fixed the rust on foliage problem, although a bit OTT :)
maclad,
Jul 19, 8:51am
I would be surprised if your rhodos have rust. Can you post a pic
heidi9,
Jul 19, 11:55pm
I would if I knew how Maclad. Ill try to explain. The leaves have whats looks like a whiteish powerish look to them on the top and underneath are covered in coppery orangey stuff? I just remember my roses looking the same so I put it down to a rust fungus.
maclad,
Jul 20, 12:23am
I wonder if they may have been affected by thrips. Very common in rhodos. The top of leaves goes silvery and the underside can be orange also spotted with small black spots. Try googling some images and if it is thrip they will need spraying in the growing season with insecticide and oil, paying particular attention to underside of leaves where thrips hide and to the soil under the plant. Thrips are so small they are hard to see.
mkbooks,
Jul 20, 12:54am
Hose it down really well to remove from the leaves + branches-give it a good feed of Rhododendron/Azalea food + keep your fingers crossed
kiwicarm,
Jul 20, 6:49am
will depend on the dilution rate you used it possibly may defoliate
heidi9,
Jul 20, 10:57pm
I googled thrips on images and the silver leaves look exactly what mine do so Id safely say thats what the problem is. Thankyou Maclad. Now to just hope that they are ok after being tortured with sulphur :-( Ill wait a couple of weeks before spraying with an insecticide.
maclad,
Jul 21, 4:10am
probably better to wait a couple of months once they are more active. Good luck. Most evergreen plants do not like LS but they should recover in time. You will probably find the most recent growth has been too damaged to recover so once frosts are gone prune it off so the new growth has a better chance.
beebb3,
Jul 21, 11:17am
They may well be totally healthy, as one variety that has what is known as - Yakusianum- in them, more of a smaller growing variety, they can have a white powdery look on top and orangey powdery fluff underneath, this is known as - indumentum - I have several in my garden and they are stunning. One is Yak Preyii and the other is called Cinnamon Bear, even have Yak FCC - google them and see if you get a decent pick of their 'top and bottom'. Dearest little rhodondendrons.
tui93,
Jul 23, 7:02am
What insecticide and oil do you use? Cheers
maclad,
Nov 15, 5:14pm
I generally use Conquer oil and Mavrik as an insecticide. But the above poster maybe on to the problem as well. If the whitish powder rubs off then they may be correct and it may be totally normal but I would still err on the side of thrip damage and the varities #13 named are not commonly grown ones.
Since the public registrations are closed, you must have an invite from a current member to be able to register and post in this thread.
Have an account? Login here.