Best Fungicide for White Powdery Mildew?
KP Devlin
2 years ago
last modified: 2 years ago
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Meyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
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First-time powdery mildew victim--help
Comments (6)Just let them be. Maybe the PM will kill them, maybe it won't. Your nursery is correct that they are prone to PM, although there are a few varieties said to be fairly resistant. The good news is that powdery mildew isn't a single fungi, but a zillion different ones that exhibit the same symptoms (white fuzzy stuff). Each fungi tends to be plant or plant family specific. Some have more ability to infect other plants than others, but for the most part PM doesn't jump to unrelated plants. The one on your bee balm is very unlikely to find other plants in your garden a suitable host which is why I suggest just leaving it alone to do it's job of attracting bees and such....See Morewhitefly??? Powdery mildew??? Why is nothing working??
Comments (8)Before I offer a bit of info, let me mention that when posting you would better help folks to assist you if you add your zone & geographic area (city or town would be good, along with the state, of course). Your "My Page" listing of "United States" is of no help whatsoever. Don't worry, we will not stalk you. :-) It's powdery mildew on the cucurbits in the first two photos. This has been of epidemic proportions in a large part of the Midwest, in my garden and from what I hear from friends and correspondents in MI, PA and here in OH. Looks like some sort of leaf miners in the last couple pictures, and blight on the tomatoes. Check the links in this earier GW post regarding tomato troubles, linked below. As for the powdery mildew, here is some info from Ohio State: POWDERY MILDEW DISEASES. Many plants are affected by powdery mildew diseases, with different powdery mildew fungi causing the disease on different plants. The most familiar way to recognize powdery mildew diseases is the actual "sign" of the powdery mildew fungus growing on the upper leaf surface. This powdery growth is a combination of asexual spores of powdery mildew fungi in combination with threadlike strands of the fungus called hyphae. The mass of this powdery mildew fungal tissue is visible to the naked eye, but individual spores and fungal hyphae are not; these forms of the fungus, capable of causing infection, are microscopic in size. One of the overwintering forms of the fungus are dark-colored fruiting bodies know as cleistothecia, that are visible as small round objects on leaves, resembling grains of pepper. "Symptoms" (effects on plants from infections) of powdery mildew diseases are sometimes not recognized as being caused by powdery mildew fungi. On a plant like lilac, often symptoms are not apparent - all you see is the powdery white sign of the pathogen. Control involves improving air movement and reducing high relative humidity, to the extent possible, with judicious pruning and plant siting and use of powdery-mildew resistant varieties when available. Also recognize that in many cases the disease causes little harm to plant health, though fungicides may be used when necessary. Common powdery mildew fungicides include: triforine (e.g. Funginex), thiophanate-methyl (e.g. Cleary's 3336), and propiconazole (e.g. Banner). Read and follow the fungicide label carefully when applying to a particular plant. Powdery mildew fungicides can be very effective because the fungal infection by powdery mildew fungi is very superficial compared to most fungal infections, with the fungus only penetrating into the epidermal layer of cells. There are organic preventives (biofungicides) for powdery mildew, too, but as you will read, most, if not all, need to be used before the symptoms develop. See http://www.gardensalive.com/category.asp?c=15 Hope this has been helpful. Here is a link that might be useful: Identifying tomato problems...See MorePowdery Mildew - my organic experience
Comments (4)rhizo: Housekeeping, as in, removing diseased dying leaves? I have been for pumpkins, not so much for my cucurbits because they are very dense. I remove what I can, but there are some dead leaves pretty buried within the vines. I am not sure the cause of the dead leaves (is there a natural amount of leaves that die on a vine from "natural" (i.e., non disease/pest) causes? I'm going to post another problem today with photos. Some of my butternut squash leaves are VERY chlorotic, and some dying, and I can't tell the cause, as others are healthy and green. (I don't think it's PM, but who knows?) I look forward to your expertise(s). rhizo ... if there's something else I'm missing as far as "housekeeping" is concerned, please let me know! :) Thanks for taking the time to be concerned and answer. -Veronica...See MoreWhat's this white powder all over my violet (powdery mildew)?
Comments (0)Powdery mildew looks like a fine white powder on the leaves and flowers. It's easily disturbed by blowing on it. Powdery Mildew is caused by a fungus, which likes sudden changes in temperature and poor air circulation. In addition to being unsightly, powdery mildew will mar flowers and leaves -- and eventually kill your plant. First, isolate any affected plant. The most effective treatment of powdery mildew on African violets is Green Light Fung-Away. It does not harm either the flowers or the leaves. Remove plants from lighted areas when spraying and wait until they dry to put them back. Make sure to spray the entire plant -- don't miss any spots! Green Light Fung Away can be found in garden centers or online. Lysol will help control powdery mildew but it's not nearly as effective as Fung-Away. Lysol also damages the flowers so it's best to disbud your violet before spraying. Once again, remove the plants from the light and wait until they dry to put them back. Hold the aerosol can about 12 inches from the plants and let the spray fall on them. Don't spray it directly on the plants because the Lysol is very cold when it comes out of the can. You'll probably need to spray repeatedly. Join us on the African Violets forum....See MoreKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agoKP Devlin
2 years agolast modified: 2 years agoKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
2 years agoKP Devlin
2 years agoKP Devlin
2 years agoKP Devlin
2 years agoewwmayo
2 years agoKP Devlin
2 years agoKP Devlin
2 years agoKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agoKP Devlin
2 years agoKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
2 years agoKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agoKP Devlin
2 years agoewwmayo
2 years agoKP Devlin
2 years agolast modified: 2 years agoKP Devlin
2 years agoKP Devlin
2 years agolast modified: 2 years agoewwmayo
2 years agoKP Devlin
2 years agoMeyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
2 years agoKP Devlin
2 years agolast modified: 2 years agoewwmayo
2 years agoKP Devlin
2 years agoewwmayo
2 years agolast modified: 2 years agoKP Devlin
2 years agoStush2049 Pitts. PA, zone 6
2 years agoMeyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
2 years agoKP Devlin
2 years agoKP Devlin
2 years agolast modified: 2 years agoMeyermike(Zone 6a Ma.)
2 years agolast modified: 2 years agoKP Devlin
2 years ago
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