Is this plant still in its original container or planted out? Ilex Crenata are quite temperamental plants. They are slow growing and not always easy to manage, even with the best care.
The most common issue is watering. Especially if in a container. It's very easy to assume all parts of the soil is moist. The larger the size, the more unpredictable it is with watering and establishment. Judging from the size of the trunk, it's pretty mature, and most likely lack of water causing it to be under attack.
Many plants receiving identical treatment and can end up with a different outcome. Mature shrubs are more susceptible in containers. Mealy bugs are often caused by warm humid conditions where there is poor air flow. Plants that have been over-fed can also be attractive to them.
Posts
The most common issue is watering. Especially if in a container. It's very easy to assume all parts of the soil is moist. The larger the size, the more unpredictable it is with watering and establishment. Judging from the size of the trunk, it's pretty mature, and most likely lack of water causing it to be under attack.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.