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Fungicide
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Author:  tismeisthatu [ 30 Jun 2021, 06:45 ]
Post subject:  Fungicide

Hi all, I have a bit of a problem this year with what I believe is ‘CEDAR QUINCE RUST’ on my hawthorns. I’ve looked it up & I am 99% sure this is what it is. The web is telling me to get & spray my trees with fungicide but I don’t know which one will be the best for just tackling this or if it doesn’t need to be a specific type of fungicide as any will do or if I should spray it at all is there a more natural way of dealing with it? Does anybody have any experience dealing with this or can offer me any advice? That would be very helpful.
Thanks

Author:  Betula [ 01 Jul 2021, 06:34 ]
Post subject:  Re: Fungicide

Hi
Have you tried picking off affected leaves ? It might be most effective treatment if the rust isnt too widespread on a small plant
Also avoid overfeeding fertiliser as this results in soft, lush growth that is easily colonised by rust
if you look on Royal Horticultural Society site https://www.rhs.org.uk/advice/profile?pid=756 they give a list of products currently available to the home gardener.
On ornamental plants the fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra) are approved for the control of rust diseases on NON EDIBLE CROPS.

Author:  tismeisthatu [ 01 Jul 2021, 07:12 ]
Post subject:  Re: Fungicide

Betula wrote:
Hi
Have you tried picking off affected leaves ? It might be most effective treatment if the rust isnt too widespread on a small plant
Also avoid overfeeding fertiliser as this results in soft, lush growth that is easily colonised by rust
if you look on Royal Horticultural Society site https://www.rhs.org.uk/advice/profile?pid=756 they give a list of products currently available to the home gardener.
On ornamental plants the fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra) are approved for the control of rust diseases on NON EDIBLE CROPS.



Thanks Betula I will check that out. I have tried to keep on top of it by pinching out the infected leaves but if I miss a couple I get these thorny bubbly cankers. Apparently it not terminal to the tree but it will just keep it looking ugly & can quickly get out of control.

Author:  Nutcracker [ 03 Jul 2021, 14:56 ]
Post subject:  Re: Fungicide

Hawthorns are part of the Rosaceae family so I'm wondering whether a fungicide intended for roses would work?

Author:  tismeisthatu [ 03 Jul 2021, 16:35 ]
Post subject:  Re: Fungicide

Nutcracker wrote:
Hawthorns are part of the Rosaceae family so I'm wondering whether a fungicide intended for roses would work?


Thanks for that. I have purchased the ‘provado fungus fighter plus’ & gave all my Hawthorn a dose today. Fingers crossed that will work

Author:  NickB [ 04 Jul 2021, 10:08 ]
Post subject:  Re: Fungicide

From my experience it is very difficult to clear once established on a hawthorn. As already said, the best thing is to remove the worst leaves and keep spraying. The trouble with modern fungicides such as Provado and Roseclear is they aren't really strong enough to do a proper job and you need to keep spraying to see results.

My best success was last year where I sprayed a number of times during the winter before the buds burst, and then again when the buds were greening. That seemed to provide a clear and healthy year ahead.

It isn't a major problem on hawthorns, but looks unsightly, and seems to weaken the tree slightly. You just got to be aware of keeping away from Junipers to prevent contamination.

Author:  tismeisthatu [ 04 Jul 2021, 14:53 ]
Post subject:  Re: Fungicide

Hi Nick, it’s a bit of a pain & the cankers do look unsightly but I was surprised at the speed of the spread of it. Last year all the Hawthorn were healthy & not a sign of illness but this year they have been hammered by scale insects & then this. I’ve sprayed weekly with ‘SB INVIGARATER’ to get rid of the scale insects as well as picking them off with tweezers but with in days I’m back picking them off again. You mention junipers but I only have 1 shohin size juniper that is easily 5 meters away & in perfect health so I have no idea how this has arrived on my Hawthorn.

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