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Thread: mold on D. filiformis giant hibernacula

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    mold on D. filiformis giant hibernacula

    I've got a pot of D. filiformis that have a cluster of hibernacula, and due to the unusually foggy, wet days here, both this and some of my S. rubra are taking a hit from mold right now. I 've used systemics in the past, and now I'm trying to veer from that - I've used an RTU bottle of sulphur/pyrethins as a test, but wondering if anyone knows of something better. Plants in question are outside, in sun - when it's there, and not overly wet...everyone else looks great!
    Last edited by Joseph Clemens; 02-02-2011 at 05:14 PM. Reason: Nomenclature adjustment

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    dashman's Avatar
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    I use powdered cinnamon when I have a minor mold outbreak during dormancy. It works pretty well. If the mold is really bad, you may want to look for something better.

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    Thanks, I will try that - the mold is just beginning, kind of like a cold trying to get into you.

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    dashman's Avatar
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    Just sprinkle liberally over the crowns and wherever you see mold.

    If they are in pots, try moving them to a drier location that gets a good amount of sun and air movement. Perhaps under a poarch or something.

    IIR, S. rubra like to be on the drier side during dormancy. I have never had a problem with my D. filiformis, but if mold is forming it is probably too wet.
    Last edited by Joseph Clemens; 02-02-2011 at 05:15 PM. Reason: Nomenclature adjustment

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    Moderator Joseph Clemens's Avatar
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    Curiously enough, many molds and fungi are not pathogenic, not even opportunistically so. Though many fungi are highly beneficial, helping to decompose organic detritus into humic acids and available nutrient compounds. Many even form symbiotic relations with plants. It's curious that so many growers see what they believe to be the hyphae of a mold or fungi and automatically panic, assuming their plant is being attacked, when it may just as easily be experiencing benefits from what is assumed to be other than beneficial interaction.

    What leads you to believe your plants are, "taking a hit"?

    BTW, "unusually foggy, wet days here,". Where is here?

    Whenever my plants were experiencing damage, possibly from pathogenic fungi or molds, it was usually way too late to rescue anything with treatments.
    Last edited by Joseph Clemens; 02-02-2011 at 04:51 PM.
    Joseph Clemens
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    Hello, I must be going... Not a Number's Avatar
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    D. filiformis are very susceptible to crown rot while dormant. The maximum period of vulnerability I find is when they are coming out of dormancy. It is very important to keep them relatively dry until full growth has resumed. Very sandy mixes and a sand mulch will help especially with the NJ Pine Barrens plants. Proper hygiene helps too - remove as much dead material as you can after they go dormant.

    I have never been able to rescue D. filiformis once fungus/mold has started on D. filiformis when dormant or coming out of dormancy. A couple times I thought I did only to watch them rot away a few weeks later. The most common fungus/mold that hits mine forms nearly invisible (too the naked eye) short thread with a white/cream colored ball at the end - about the size of the period on the end of this sentence. Sulfur will knock this stuff out but it will always come back in a few days.
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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    Moderator Joseph Clemens's Avatar
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    I have used RootShieldŽ brand, Trichoderma harzianum inoculum powder, it is a fungus. One of the first times I ever used it was on a small group of Pinguicula jaumavensis plants that were rotting in transit and were seriously affected by the time I received them. In desperation I dusted the rotting plants with the RootShieldŽ powder, I carefully coated all surfaces of the rotten and non-rotten plant parts with the powder. These small plants were so seriously affected by decomposition, I really only did this in a desperate attempt to try to salvage some viable material I could perhaps propagate from. To my surprise, the rot was entirely arrested, and after I planted them, all the plants quickly recovered.

    I have used this product - I will continue to use it regularly. I believe it has positive beneficial affects. I do not think it is as good as sliced bread, nor that it can cure all ills. It is just one tool, of many, that can useful in the horticulturists toolbox.
    Last edited by Joseph Clemens; 02-02-2011 at 08:03 PM.
    Joseph Clemens
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    Hello, I must be going... Not a Number's Avatar
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    I've tried a couple Trichoderma based products on ailing D. filiformis, one of which is very popular with Cephalotus growers to no effect. The FAQ on this product warns not to apply if there are active fungal infections although one user swears it cleared up an infection on his Cephalotus. Yes, the product was fresh from the manufacturer. Either the infections were too far advanced or the product was ineffective. I had been dosing per instructions the D. filiformis prior and during dormancy in hopes of heading it off. However the person taking care of watering my plants when I was recovering from surgery could not come by every day so I had left instructions just to keep everything in enough water that it didn't dry out between visits even though it meant losing my D. filiformis collection and others.

    However these products use different strains and/or species of Trichoderma so your mileage may vary depending on the product and the source of the infections.

    I've since obtained a tiny amount of Benomyl and a larger amount of Cleary's 3336 systemic fungicides for my arsenal. These seem to be the favored fungicides of many of the CP growers I'm in communication with. Unfortunately Benomyl is no longer available in the Western Hemisphere.
    Last edited by Not a Number; 02-03-2011 at 09:10 AM. Reason: correction of fungicide name
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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