why are there white spots on my pumpkin leaves?
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Powdery mildew, a fungus that looks like a white powder that spreads until it covers the leaves of pumpkin plants, can cause the foliage to drop. ... Water the soil near the plant, but avoid getting water on the leaves. Remove leaves that have mildew spots.
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Of the two kinds of powdery mildew which can affect tomato plants, Oidium lycopersicum shows as white spots on the upper surface of leaves. Other telltale signs that your tomato problems are caused by powdery mildew are white spots on the stems.
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White Powdery Mildew. Have you seen white spots on your leaves? Are your leaves dusted with round patches of powder that looks like flour? If so, you're most likely dealing with White Powdery Mildew, also known as White Powdery Mold or just “WPM” to cannabis growers.
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The white spots on the squash leaves are almost certainly powdery mildew. Powdery mildew is a fungus and squash plants are very susceptible to infection. ... These spots grow larger and will eventually cover the whole leaf causing it to turn yellow.
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Plants infected with powdery mildew look as if they have been dusted with flour. Powdery mildew usually starts off as circular, powdery white spots, which can appear on leaves, stems, and sometimes fruit. Powdery mildew usually covers the upper part of the leaves, but may grow on the undersides as well.
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Powdery mildew on houseplants is a fungal disease. Initially, it produces circular powdery white spots on the foliage of plants. As the disease spreads, the entire plant material can be affected with the fluffy white fungus. ... The spores spread in the air and when water splashes on plants.
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See white spots or patches on Japanese maple leaves? That's likely powdery mildew. As the name suggests, powdery mildew causes dusty growth on the top of tree leaves. Like leaf spot and anthracnose, the worst-case scenario is defoliation.
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If you see circular, brown spots on Japanese maple tree leaves, it's likely a leaf fungus called leaf spot. Or if the spots are more free-form, that could be anthracnose, another common leaf disease. ... In more severe cases, like Linda's, trees may drop leaves prematurely.
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Powdery mildew fungus can also cause the appearance of white coloration on the leaves of squash and many other plants. ... The object is to allow the air around the leaves to dry by nightfall. If you water in the evening, the humidity around the plants will favor the growth of the fungus.
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The powdery mildew fungus causes a white to light gray, powdery growth to form on the surfaces of rubber plant leaves or shoots. The mildew typically starts out as small spots or patches that enlarge until they cover the entire surface area.
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Entomosporium leaf spot is a common problem for photinia, and it's recognizable by small red spots on both sides of the leaves. Older plants might have larger, dark red, brown or gray spots with rings around the edges. As the disease progresses, the leaves fall off, and the plant can eventually die.
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Primarily the disease is fungal in variety and resulting from the same cause, overwatering. Too much water in the soil stimulates the fungal spores and causes root rot, Alternaria or Septoria leaf spot, which has dark borders surrounding the white blotches on the leaves.
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White Spot White spot is a leafy vegetable disease caused by fungus Pseudocercosporella capsellae. The crop infected by the fungi usually has brown or gray spots on the leaves. ... The fungus can survive on seeds, so you can prevent it by planting certified seed.
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Few pests or diseases cause white spots on fig trees (Ficus carica). Fig trees grow in the warm climates of U.S. Department of Agriculture plant hardiness zones 8 through 10 and can be invasive in some areas. Mosaic virus and scale insects can cause pale yellow, almost white spots to form on leaves.
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Answer. This is mysterious. Most fungal diseases found on hydrangeas cause leaf spotting on the foliage rather than the stems, so I suspect that the white spots could be the eggs of a sap-sucking scale insect called Pulvinaria hydrangeae, or hydrangea scale. This limpet-like insect also feeds on acers and cherries.
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If you notice white spots on the surface of your gardenia leaves, it is likely powdery mildew. The only way to get rid of the powdery mildew spots is to spray your gardenia leaves with a folia fungicide. Never spray water directly onto your plant when powdery mildew is present.
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The most common white spots are 'Idiopathic guttate hypomelanosis'. These white spots on the skin are usually caused by sun exposure. In the case of too much UV exposure, the skin cells can change in color.