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Do insects appear on your bougainvillia or other shrubs and are the leaves sticky?
If you see many leaves falling off from your olive tree, and there are blackish stains on the surface of the leaves, this means that it is suffering olive spot.
The cockchafer or melolontha melolontha is a very common pest in lawns.
Many species can suffer nitrogen deficiency as lawns tend to be very sensitive. This deficiency causes a general weakening of the lawn as the leaves are yellow.
Your palm leaves are falling and the central leaves are gnawed? If you see these symptoms, this means your palm tree is infested with the palm snout beetle.