![]() ![]() Let’s look at your list:ġ) Is it – a specific mineral deficiency in the soil, such as iron, magnesium or zinc One of the great thing about nature is that the “clues” are usually right in front of us if we are thoughtful and observant enough to identify them. It is rare to see a wild plant with white leaves but good fun to ponder the mystery. If you know more about this condition in the wild, please leave a comment. Was the 2017 growing season especially bad for the bacteria mentioned above? Or does chlorosis happen every year and I’ve just not noticed? Interestingly, the plants I photographed are in the Aster Family ( Asteraceae) and one of them has complete chlorosis. tagetis that causes complete chlorosis on Asteraceae. presence of any number of bacterial pathogens, for instance Pseudomonas syringae pv.pesticides and particularly herbicides may cause chlorosis, both to target weeds and occasionally to the crop being treated.a soil pH at which minerals become unavailable for absorption by the roots.a specific mineral deficiency in the soil, such as iron, magnesium or zinc.Here’s the list from Wikipedia, with my added: But why?Ĭauses of chlorosis are wide-ranging. Since chlorophyll uses sunlight to make food for the plant, it’s a sign the plant is in distress. The condition is called chlorosis and it means the plant is not producing enough chlorophyll to look green. Leaves in distress: top is white, 31 July 2017 (photo by Kate St. The plant below had advanced to the stage where some of the stems were completely white. The leaves had been green but now their tips or even whole branches were white. In July and August I noticed something I’d never seen before along the trails of western Pennsylvania - scattered instances of leaves turning white. ![]()
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