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  Arisaema disease
From: Steve Marak <samarak at gizmoworks.com> on 2017.07.30 at 15:46:20(23791)
Anton,

I've experienced exactly what you describe here in NW Arkansas.

None of the Asian species I've tried outdoors here, including
sikokianum, candidissimum, ringens, fargesii, and others, last more
than about 5 years outdoors. They look good for a couple of years,
less good for a couple more, then just don't appear one spring. The
few I have now I keep in pots in the greenhouse, where they do fine
if I store them in the coldest corner over the winter.

We do have the arisaema rust here in native populations, and we do
grow the native species in the yard, but some of the Asian species
declined and disappeared without ever showing the characteristic
orange pustules you mention.

Steve

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From: "J. Agoston" <agoston.janos123 at gmail.com> on 2017.07.30 at 22:31:53(23794)
Dear Steve,

For rust you may want to apply tebuconazole (250 mg/ml active ingredient) 1 ml/l of water 10-14 dasys interval, or even bettrer: tebuconazole (160 mg/ml) + triadimenole (40 mg/ml) + spiroxamin (250 mg/ml) 1 ml/l, biweekly. You have to start spraying as soon as the first leaf starts to unfold, and stop when it turns from yellow do brown. To cure an infection you should do the spraying in at least 2 consecutive years, 3 consecitive yers are the best. When spraying also note that it shopuld be a spray or mist like action on the leaf, if droplets roll down from the leaf it may cause burn (phytotoxicity) at the point where it rolles of from the leaf.

With Best Regards,

Janos

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