how can i cure elm with leaves turning yellow and under full of small insects? current period (June) and then others fall continuously, can I cure them with sulfur plus copper? or does it take an insecticide? thanks .

Elm tree

Dear Renato,

the yellowing of the leaves of the elm can be due to various factors, including the presence of animal parasites, in particular red spider mites, but not having a photo of your plant it is difficult to understand what animals they are. If they are red spiders the leaves should be covered with a thousand different yellow or white dots, due to the bite of these mites, which however you should not see with the naked eye, as they are very small; also among the leaves you should see some thin cobweb. However, it could also be insects, such as whiteflies, leafhoppers, aphids: it depends a lot on how you cultivate the plant, and on the climate around it. Not being able to know what parasite it is, you can try taking a leaf with unwanted guests to a garden center, to see if they can help you; or treat the plant with a systemic insecticide, which will circulate throughout the plant, eradicating any insect or mite present on it. But the yellowing leaves can also be a symptom of various other problems: – Excess sun: many hours of direct sunlight during the hot months can quickly cause yellowing of the foliage, which dries up and falls; even plants that love direct sunlight, during the hot season, should be grown in partial shade, so that they are sheltered from direct sunlight during the hottest hours of the day; however, it also avoids total shade.- Fungal diseases, favored by a high humidity of the soil; excessive watering, which keeps the soil always soaked with water, can favor the development of rottenness; against these diseases it is necessary to provide the piata with a systemic fungicide, which enters the plant’s circulation, in order to kill the parasites. asphyxiation of the roots constantly immersed in water. Small bonsai pots contain a small amount of soil, and the roots of small saplings are few, which is why any variation to their ideal growing condition can cause extensive damage in a short time. it is sufficient to consider the most obvious causes of the problem, those that catch the eye simply by looking at the plant; rather it is always good to consider everything that may have happened to the plant; indeed, upstream, it would be advisable to try to grow a bonsai always in ideal climatic conditions.

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Elm Diseases – Bonsai Questions and Answers

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