Stagonospora Curtisii help

jim lykos
Sun, 11 Dec 2011 21:15:12 PST
Hi Fred and all,

I have had a long term adversarial relationship with Stagonospora Curtisii, 
but have learnt to live with it within bounds.
Since I have around 300 hybrid Hippeastrum cultivars growing robustly in 
naturalised low native grasses, and below natural  sandstone ledges it 
depends on seasonal Spring conditions as to whether there is a small or 
major outbreak of  Stagonospora Curtisii.

This winter and the first two weeks of Spring were very dry and  there was 
no sign of Stagonospora. However it has now rained and showered constantly 
for the past 5  weeks - with the wettest period in Spring here in Sydney for 
the past 50 years, and Stagonospora has now infested around 60% of all the 
Hippeastrum cultivars. However in most flowering seasons the level of 
infestation is temporary.

My containment method is to remove and dispose of all infected leaves with 
the red staining and yellowing coloration of the leaves- and as soon as it 
stops raining long enough to apply a foliar spray of a Phosacid Systematic 
fungicide.  Its active constituent is 200g/litre Phosphorus acid present as 
Mono-D Potassium Phosphite.  It works wonders in containing the fungus and 
when applied during a growth period it gives plants and seedlings a growth 
spurt or counteract the diminishment of healthy leaf activity caused by the 
I continue spraying fortnightly if its not raining (no watering) - but if 
there are further periods of rainfall I wait again until rainfall eases 
before another spray  of the fungicide.  The only other task is to pray for 
the rain to ease.


----- Original Message ----- 
From: "Fred Biasella" <>
To: "Pacific Bulb Society" <>
Sent: Monday, December 12, 2011 4:21 AM
Subject: [pbs] Stagonospora Curtisii help

> Hello Folks,
> I have a pot of Hippeastrum Reticulatum var. Striatifolium that is showing
> signs of the dreaded red blotch on the their bulbs. All the literature 
> I've
> read says that a systemic fungicide should be applied to the leaves for
> treatment. The only problem is that they're entering their dormant period
> and have stared shedding their leaves. Can anyone suggest a course of
> action? I really enjoy theses little beauties and I don't want to lose 
> them,
> nor do I want to endanger my countless other amaryllids!!!
> Warm Regards and Thanks,
> Fred Biasella
> Cambridge (Boston) MA
> _______________________________________________
> pbs mailing list

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