Carnation thrips

Systematic position. The carnation thrips (Pezothrips dianthi) belongs to the order Thysanoptera and the family Thripidae. It is a highly specialized insect pest that primarily targets floriculture crops, causing economic losses for greenhouse growers and gardeners alike.

Host plants. As the common name suggests, the primary host plant is the carnation (Dianthus). While they show a strong preference for carnations, these insects can occasionally infest other decorative flowers, especially when grown in close proximity or under greenhouse conditions where environmental stress is low.

Biology and life cycle. The life cycle consists of egg, larva, propupa, pupa, and adult stages. Females insert their eggs into the plant tissue of buds and young leaves. The development time is highly temperature-dependent, and in warm indoor environments, multiple overlapping generations can occur throughout the year, leading to rapid population explosions.

Damage and harmfulness. Both larvae and adults feed on plant sap by piercing the epidermal cells. The damage is characterized by silvering or scarring on petals and foliage. Infested buds often become distorted, fail to open properly, or show unsightly necrotic spots, making the flowers unsuitable for commercial sale.

Protection measures. Effective control requires an Integrated Pest Management (IPM) approach.

• Regular monitoring using yellow or blue sticky traps to detect early infestations.
• Strict sanitation practices in greenhouses, including the removal of infested plant debris.
• Use of systemic insecticides when populations exceed economic thresholds.
• Biological control options, such as the introduction of predatory mites or insects.
• Screening vents and doors to prevent migration of adults into greenhouses.