Jasmine spots

Question: jasmine stains

Goodmorning everyone
I write you certain in a help: I ​​have two small rincospermum plants, one of which is late (with red leaf in autumn), plant this spring with fertilizer and regularly wet (although this year there was no need ... ), in place by means of the sun, next to a net fence; we have noticed that lately red spots are forming on the upper side of the leaves, in the red center it is very intense that it gradually fades.
The adjacent hibiscus has no problems and the photo has some little signs but nothing overly anomalous.
I cannot understand if it is a fungus, even if it does not seem to me, or if it is due to some deficiency (manure, water, sun, ...).
If you want I send you a picture for more details.

Answer: jasmine stains

Dear Stefano,
ricosperni (trachelospermum jasminoides) are very vigorous climbing plants, which can survive even in not entirely ideal conditions; it often happens that some of their leaves redden and fall, but it is simply a physiological fall, as even the evergreen plants lose some of their leaves to replace them. In your case, however, it seems to me that this may be a problem related to a fungal parasite; not having a photo, I'm not sure what it is, also because you are talking about watering and the fact that spring 2013 was very humid. So you have two options, or the leaves have been attacked directly by a fungus, like a rust, which is developing accordingly on the whole plant, or the roots have been attacked by a fungus, by root rot, and from the roots the fungus it is spreading throughout the plant, ruining the leaves. Another disease that causes spots, brown, dark, reddish or black, often with a yellowish halo, is the scab, which strikes the leaves, especially those of roses, but there is no lack of cases of scab on all the plants ornamental. The cure, in both cases, passes through the use of a fungicide, possibly systemic, that is that it is absorbed by the leaves and enters the plant in a circle; there are many on the market, looking for a broad spectrum, it should solve the foliage problem fairly quickly. Clear that then it would be appropriate to clean up the base of the plants with fallen leaves, because many fungi are able to survive in the soil, and from there then return to the plant when it is no longer "covered" by the fungicide. In addition to this, some fungal diseases develop especially in the case of high humidity and poor soil drainage, such as root rot, which tends to develop especially in the case of stagnant water. If your plants are affected by root rot, this means that they are grown in excessively heavy and poorly drained soil, so it will be advisable to dig the soil around the ricosperni, avoiding ruining the roots, and working it by mixing it with sand or soft soil. fertile, in order to avoid any other attacks by the rots. Also a good ventilation of the plants and a correct insolation allows to keep the most widespread diseases under control and also to remove many animal parasites.