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My potted lupine plants have powdery mildew and I'm getting rid of the plant. Asked October 16, 2019, 10:51 PM EDT. Although downy mildew of alfalfa is attributed to the same organism, it is unlikely that an alfalfa isolate will infect lupine. Photo by Pollinator. Crowded lupins, or overly-shaded plants are also more prone to powdery mildew. powdery mildew on lupine. What about lupine in the ground, do I need to dispose of the plant and/or the soil? Tonyl . (Sorry about the fly that has tried to get in on the act) 9 Jul, 2016; Answers. While almost no type of plant is immune--unless they're specifically bred resistant hybrids--certain species are more susceptible than others, including lilacs, flowering crab apple trees, phlox, red bee balm plants, roses, squash, cucumbers, and more. Gilli . How powdery mildew occurs. There are even some plants, such as the lilac, that can have the powdery mildew on it and it doesn’t hurt the plant that much.So using a homemade cure for powdery mildew on the hardier plants isn’t necessary. It easily gets confused like mold, although the effects of mold are much more serious in cannabis plants.. Powdery mildew is far more common compared to downy mildew but it is important to recognise the difference between the two if you plan to treat either of them. Linn County Oregon. Fields flushed blue-purple with lupine are a common summer sight in many parts of the country, because lupine (Lupinus spp.) The first symptom of infection is the appearance of white powder spots on the surface of the leaf: if we run our finger over the dust spots and remove them easily, we can be sure that it is powdery mildew. Powdery mildew is usually a symptom of over-watering or improper watering. Numerous studies have shown milk and/or whey to be even more effective at killing powdery mildew than chemical fungicides. Sorry I should of asked how to get rid of it as well. This organism is favored by wet, rainy conditions in spring and generally is a problem only in gardens. Hi Fluff, Try to make sure your lupins have room enough. Another thing to remember is that if one type of plant gets it, that particular strain of powdery mildew won’t transfer to the other types of plants. When powdery mildew is already on your lupine, an afternoon water spray, wetting leaf surfaces, will leave fewer places for spores to attack. Is this mildew please on my lupins, I deadheaded them a few weeks ago and they were fine but now all the leaves have a whitish substance on them. Lupins are particularly vulnerable to mildew, wherever they're planted. As soon as powdery mildew is seen on lupins, cut off the affected area of the plant and throw them away in the garbage. If this does not control the disease, fungicides are appropriate, but sprays are most effective if applied as soon as the disease is detected. Milk. When it comes to diseases that may befall your plants, powdery mildew tops the list as one of the most common culprits. Do I also need to dispose of the soil? They key identifier is that downy mildew has the white powder on the under side of the leaves only whereas powdery mildew has a white powder on both the underside and top of the leaves. Powdery mildew completely covering this leaf. 2. It will spread quickly to the rest of the plant if left unchecked. Lupine Troubleshooting. In a 2009 study by the University of Connecticut, which tested a milk treatment of 40% milk and 60% water on plants infected with powdery mildew, "the milk treatment provided significantly less disease than the untreated control, and the chemical treatment … 22 Jun, 2009 . 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