Portuguese laurels can be susceptible to infestations of thrips. These tiny insects feed by sucking sap from the leaves. Their presence is usually first noticed when the upper surface of the leaf develops a silvery appearance, while the underside may show brown speckled discolouration.

Why thrips appear

When plants are under stress, either from lack of water or poor nutrition, they are more vulnerable to thrip attacks. Keeping your hedge healthy with regular watering, feeding, and adding fresh Daltons Garden Time Compost to the soil can help reduce the chances of infestation. Feed with Daltons Premium Tree and Shrub Fertiliser.

Controlling thrips

If thrips are present, they can be controlled with regular spraying. Organic options include horticultural oil, pyrethrum-based sprays, or neem oil. Spraying needs to be repeated at regular intervals rather than treated as a one-off application. Non-organic contact insecticides will also control thrips. Talk to your local garden centre for products to choose from.

What to expect

Unfortunately, leaves that have already been damaged will not return to their original healthy colour, as the discolouration is permanent. Over time, the affected leaves will drop and be replaced with fresh healthy green growth.

Check your hedge regularly so any thrip activity can be picked up early and treated before it spreads through the plants.