Tonyl . Milk. What about lupine in the ground, do I need to dispose of the plant and/or the soil? 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. As soon as powdery mildew is seen on lupins, cut off the affected area of the plant and throw them away in the garbage. Sorry I should of asked how to get rid of it as well. 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. You could spray them at the first signs of its reappearance with a fungicide, preferably a systemic one. is first and foremost a wildflower. 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. Photo by Pollinator. It easily gets confused like mold, although the effects of mold are much more serious in cannabis plants.. 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. 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. Hi Fluff, Try to make sure your lupins have room enough. (Sorry about the fly that has tried to get in on the act) 9 Jul, 2016; Answers. 2. Although downy mildew of alfalfa is attributed to the same organism, it is unlikely that an alfalfa isolate will infect lupine. When powdery mildew is already on your lupine, an afternoon water spray, wetting leaf surfaces, will leave fewer places for spores to attack. When it comes to diseases that may befall your plants, powdery mildew tops the list as one of the most common culprits. powdery mildew on lupine. If this does not control the disease, fungicides are appropriate, but sprays are most effective if applied as soon as the disease is detected. Crowded lupins, or overly-shaded plants are also more prone to powdery mildew. My potted lupine plants have powdery mildew and I'm getting rid of the plant. 22 Jun, 2009 . Do I also need to dispose of the soil? How powdery mildew occurs. Gilli . It looks like a dusty coating in gray, white or black on the lupine's leaves, stems or flowers. Fields flushed blue-purple with lupine are a common summer sight in many parts of the country, because lupine (Lupinus spp.) Powdery mildew is usually a symptom of over-watering or improper watering. Lupins are particularly vulnerable to mildew, wherever they're planted. Lupine Troubleshooting. 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. 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. Numerous studies have shown milk and/or whey to be even more effective at killing powdery mildew than chemical fungicides. Linn County Oregon. Asked October 16, 2019, 10:51 PM EDT. It will spread quickly to the rest of the plant if left unchecked. 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