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Good morning I have a hedge of lailandi (I don't know if you write like this) it seems that 3 plants have taken a "mushroom" lose their needles and dry out, the solution?
cupressocyparis leylandii is a medium-sized resinous plant, widely used for preparing hedges with low maintenance and rapid development; unfortunately, as with many cupressaceae, cupressocyparis is also subject to attacks by the so-called cypress cancer. It is a fungus that lives in most of the world, coming from North America, which survives in our climates, both in the heat and in the cold; it is small in size, and its microscopic spores can be carried by the wind, and settle on the bark of plants; from the bark, through the cuts of the prunings, or the abrasions due to the bad weather, it penetrates inside the bark, developing in the wood. Typically, this type of infestation causes leaf yellowing, and rapid decay of leaves and branches, starting from the outer part of the foliage, towards the inside. The only treatment to do in these cases is to remove all the diseased parts, cutting up to about 25-30 cm below the yellowed leaves or lesions on the branches, in order to reach healthy wood. The wood must be destroyed, and the ashes must be thrown into undifferentiated waste; cuts made should be protected with mastic for pruning, tools cleaned with alcohol, and the whole hedge should also be treated with Bordeaux mixture, or other fungicide, to kill any spores left on the bark. Since you have a hedge all of cypresses, the fact that the desiccations concern only some areas of some specimens immediately makes you think of this type of fungal disease, because, if it were problems due to soil or climate, or watering, all the plants would now be suffering in a more generalized way; cypress cancer, on the other hand, tends to penetrate through wounds in the trunk, and therefore it often happens that it affects even a single specimen of a long hedge. Given that through the wind, from your plants, the fungus with its spores can reach the other plants of your garden, but also of the gardens close to you, it is the case to intervene as soon as possible, to remove all the wood and the foliage affected by cancer.