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name my fungus
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Posted by sirsedum 7 (My Page) on Fri, Nov 20, 09 at 9:57
| Ok, so I posted this on the pest management forum, but it doenst seem to get much traffic.
I treated my entire greenhouse with T-Bird (Thiophanae-methyl)
4 days ago, and this morning during my walk around I found fresh fungal colony on some freshly planted Iris. The fungus was not on the plant, only on the bare peat. The link here is for the full size image, which was taken at about 100x from my IPM Scope. The image posted is the same as the link, just shrunken to fit GardenWeb's size limits. Thank you for your help
http://i1000.photobucket.com/albums/af127/sirsedum/Picture002.jpg |
Image link: name my fungus (15 k)
Follow-Up Postings:
RE: name my fungus
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| Maybe it is a type of mycorrhizal fungi. See link below for an article that may be useful to you. |
Here is a link that might be useful: Soil Fungi
RE: name my fungus
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| from what i know about mycorrhizal fungi, which is not a ton, is that they are beneficial. these fungus, growing on the surface, i do now believe to be beneficial. but i could be wrong. |
RE: name my fungus
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| Believe it or not, most of the common fungi we find evidence of growing on the soil or the surface of potting soil/containers are beneficial or at the very least, harmless. They are just a natural manifestation of the decompostion of any organic matter that may be included in the soil/potting mix. As long as the plant appears healthy otherwise, is not overly wet and the fungal organism doesn't appear to 'move' or invade the plant tissue, then I would be inclined to ignore it. btw, there are about 1.5 million recognized fungal species - unless it was something dead common, I'd be very impressed if someone from this forum could ID for you :-) |
RE: name my fungus
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| good point gal. alas my bosses think that we have big problems with Phytopthora and Rhizoctonia and we are actively treating for fungus about once ever two weeks. And due to the crappy greenhouse owner who wont fix an air pump, we are having to water from above instead of below and are having problems with fungus on leaves as well as across the surface of the pot. Which does not look two attractive when it comes time to ship the plants. I'm just trying to learn about what I can and stay a few steps ahead of the problems. I also found this site in which this person has a more advanced problem, but the fungi looks identical. |
Here is a link that might be useful: neem solves fungi
RE: name my fungus
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| That stuff growing on the soil and on the plants in your link looks like a harmless slime mold to me. Which is not a fungus (nor a mold) at all. |
RE: name my fungus
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| AFAIK, the kind of fungi that would form a mycorrhizae with an Iris would not normally produce hyphae above ground. |
RE: name my fungus
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| It's worth mentioning that the 'expert' (Greg Hamby) on the site you've linked provided an erroneous response on a couple of levels. Not only is the image clearly NOT downy or powdery mildew, but his statement that any fungus will [defiantly] damage your crop is a false one. Yikes. |
RE: name my fungus
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The photo needs to be much more magnified to identify the fungus. It needs details. It needs to show the reproductive structures.
Carol |
RE: name my fungus
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I re inspected the Iris again to day, and saw no further signs of the fungus. Boss told me to spray it anyways, so I hit it with Subdue Maxx, along with a few other plants. I'll keep my eyes open. I just found that Expert thing with I went to search for my fungi on the net. He is not MY expert. YOU all are my experts. Until next time!
SirSedum |
RE: name my fungus
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| Your boss is throwing good money down the drain. Even if the fungi in question were serious problems for plants (and I don't think they are), no amount of chemicals will get rid of the problem until the contributing factors are eliminated. (Moisture levels, water contamination, poor air circulation, unsanitary conditions, etc.) As I and others have posted in this thread and another one you posted, it appears that you are seeing the mycelium/hyphae from one of the many thousands of decomposing fungi. They are often present in peaty potting mixes, working hard to decompose all of that organic matter. Not a problem for plants. The other issue, if it is the same as that image you linked us to, is definitely a slime mold. Also not a problem for plants. Do you use a good, sterilized potting mix? Most of the time, the steaming process gets rid of even the beneficial fungi (like the decomposers), but I'd wager that most of us have observed stuff like this in their containers at one time or another. If you are having problems with the plants, as in wilting and eventually dieing, then you can consider any of the disease causing fungi. Neither phytopthora nor rhizoctonia exhibit the physical symptoms you've illustrated. I think you should contact your local university extension service to find out how to take samples for laboratory evaluation. Most of the state research universities have plant pathology clinic services available for a small fee. They will want properly collected plant samples, and probably a soil sample. |
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