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One last reason you may have dropping leaves is because of vine weevil beetles and their grubs, this is more of a problem for plants that are grown in pots. Although adult vine weevil eats the leaves, usually around the edge of the leaves, it is the baby grubs that live in the soil and look similar to a maggot that causes the most damage as they eat the roots. Eventually, causing enough damage that the root system cannot support the plant and the first sign is usually the leaves start to droop. You can buy pesticides especially for vine weevil and it can be applied as a drench to the soil.
