Orchid thrips

The orchid thrips (Dichromothrips corbetti) belongs to the order Thysanoptera and the family Thripidae. It is a highly specialized pest known primarily for damaging various orchid species, causing significant aesthetic and economic losses in commercial greenhouse production and amateur collections alike.

The biology of this species is adapted to greenhouse environments. The life cycle progresses through eggs, two larval stages, prepupa, pupa, and adult stages. Both larvae and adults feed by piercing plant cells and sucking out the contents, typically concentrating on the delicate tissues of buds and open flowers.

Damage is characterized by distinct silver or white streaking and necrosis on the petals and sepals. As the infestation progresses, buds become malformed, fail to open properly, or drop prematurely. The presence of black fecal spots on the flowers is another common indicator of an active population.

Orchid thrips are particularly harmful due to their ability to hide deep within the floral structures, making early detection difficult. Their feeding habits also weaken the plant, leaving it vulnerable to secondary infections by bacteria and fungi, which can lead to rapid rot of the reproductive parts.

Effective management requires an integrated approach. Prevention starts with strict quarantine of new arrivals and the placement of sticky traps for early monitoring. Chemical control involves the application of systemic insecticides applied as sprays or drenches, ensuring that treatment covers all crevices where thrips might hide.

• Regular application of systemic insecticides (e.g., spinosad or neonicotinoids).
• Use of yellow or blue sticky cards for population monitoring.
• Strict quarantine for all new plant material.
• Removal and destruction of heavily infested flower spikes.