Help - Amorph disease

From: "Agoston Janos" agoston.janos at citromail.hu> on 2006.07.10 at 11:27:02(14406) Dear Susan, I can understand your problem, becouse one year I lost all of my Zantedeschias. But I also would like to correct you. Erwinia carotovora is in all natural soils which were not disinfected by heat. This bacteria attacks the tubers when the soil is soggy and anaerob (= without air). The second thing is what I saw is this bacteris usally attacks the tissues at the top of the tuber, where the leafs attach. And for the leaves it is going upward. I also contacted with a dutch Zantedeschia breeder, who told me that Z. aethiopica is resistant to this kind of rot, because it grows in marshes. So you may try these varieties, becous you may have better luck. I was able to rot hese tubers too, but before rotting they became infected with a fungus, perhaps Pythium. This fungus loves wet conditions, the sympthomes are smelly rot and melting as Erwinia, but you can kill this with strobilurines as azoxistrobin (Amistar, Quadris). +More Bye, Jani ----- Original Message ----- From: Susan B To: Discussion of aroids Sent: Monday, July 10, 2006 4:12 AM Subject: Re: [Aroid-l] Help - Serious spreading Amorph disease Hi Adam,I lost my entire crop of konjacs to this about 5 yearsago. It affected the konjacs while other Amorphsright next to them had no problems!I've also lost a significant amount of Zantedeschia tosoft rot/Erwinia 2 years ago. The plants looked justfine, until suddenly they toppled over at the base. The petioles looked like they melted. I've also seenit affect cut flowers- the plant looked fine, theflower was picked and put into water in a vase. Thenext day the petiole would have literally dissolvedall the way up to the spathe, which would look OK fora little while and then it too would start to "melt".My soft rot/Erwinia, which, by the way, I understandis two different diseases but work together; seemeddifferent from your plant's symptoms. First, the rot would progress up the petiole or downto the tuber. I could pull the bloom and leaves rightout of the ground with no effort. Second, it has avery awful, rotten, stinky smell. The tubers wouldalso be affected, with large sections rotting off. Erwinia is a bacterial disease (if I remembercorrectly), it is very contagious and can be carriedon feet from one site to another. Phyton 20, a copperbased formula, is said to prevent it, but bulbs mustbe sprayed before planting. I believe if it affectsan area you are not supposed to use that soil againbecause it is infected.I did rescue a few of my tubers that weren't too badlyaffected, I used a water hose to vigorously spray themuntil all the mush washed away. Then I dried thetubers in the sun/ air as much as possible. Some ofthem were viable the next year, I only had about 3plants with it last year as opposed to maybe a hundredthe year before.Truly a heartbreaking disease. I wish you luck withit. Since your tubers seem to be OK, you may havesome other disease or pest going on....Susan B __________________________________________________Do You Yahoo!?Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________Aroid-l mailing listAroid-l@gizmoworks.comhttp://www.gizmoworks.com/mailman/listinfo/aroid-l _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

From: Susan B honeybunny442 at yahoo.com> on 2006.07.11 at 02:25:09(14412) Thank you for your corrections Jani, and I have one of my own! It is Phyton 27, not 20! Aethiopica is (supposedly) a winter grower here, although I have several in bloom now. I didn't think my soil was that bad, the tubers were in the ground, not pots. thanks for the additional info! Susan +More --- Agoston Janos wrote: > Dear Susan, > > I can understand your problem, becouse one year I > lost all of my Zantedeschias. > > But I also would like to correct you. Erwinia > carotovora is in all natural soils which were not > disinfected by heat. > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

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