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Question: olive tree


I bought an olive tree in a market is about 60 cm high and I put it out on the balcony where there is a lot of sun, but I noticed that the new leaves have areas with yellow spots and then they tend to curl up. they are more concave than the old ones. What can it depend on? Greetings.

Answer: olive tree


Dear Guido,
the most common, and worrying, parasites of the olive tree, generally affect mainly the fruits, where they lay larvae or cause small dark and hard marks, which make the olives inedible; another typical olive tree disease is the peacock eye, which causes typical spots, with a dark center, almost black, and a light yellow outer edge, to imitate those large signs that appear on the peacocks' tails; in your case I think we shouldn't think about this kind of parasites.
Rather it could be more common parasites that usually afflict ornamental plants, such as cochineal or mites; both of these parasites cause small yellow specks on the foliage, caused by their pungent apparel, which pierces the outer skin of the leaf, to suck its sap. Both cochineal and mites generally develop in very dry conditions, with a sunny position and poor ventilation. In the case of mites, you may not see insects, as they are tiny in size; in the case of the cochineal instead you should be able to notice the insects, or the small sacs, covered by a cottony substance, or waxy, or dark, which generally lurk on the lower page of the leaves, very often near the central grain.
Regarding the cochineal, against them pyrethrum insecticide products are used, in the cool climate months these products are mixed with white oil, but it is not recommended to use white oil during the warm months.
As for the mites instead, they are arachnids and not insects, so often the most common insecticides have no effect; therefore special acaricides are used, which you can find without problems in the nursery.
Since your small plant is located in a very sunny area, I remind you to do the treatments in fresh moments and with the sun not yet dazzling, so in the early hours of the morning, or in the evening, possibly when not near the plant there are flowering plants, because you could disturb or even kill useful insects.