Hawaiian flower thrips

The Hawaiian flower thrips (Thrips hawaiiensis) is a prominent member of the order Thysanoptera and the family Thripidae. It is a highly polyphagous pest known for its widespread presence in tropical and subtropical regions, often causing substantial economic losses in both agricultural and horticultural settings.

This pest has a very broad host range, including many commercially important crops such as citrus, grapes, and various vegetables. It is particularly damaging to ornamental plants, including roses, carnations, and chrysanthemums, where it frequently targets the flowers and buds, rendering them unmarketable.

The life cycle of Thrips hawaiiensis consists of egg, two larval stages, prepupa, pupa, and adult stages. Development is highly temperature-dependent; in warm greenhouse conditions, the insect can complete its generation cycle very rapidly, leading to explosive population growth if not controlled effectively.

Damage symptoms typically include silvering or bronzing of leaves, wilting, and distorted growth of flowers and fruits. By piercing plant cells and sucking the contents, the thrips cause necrotic spots and stunted development. Furthermore, they are well-known vectors of plant viruses, which can devastate an entire greenhouse crop.

Effective management requires an integrated approach. Growers should prioritize exclusion methods, such as the use of fine insect netting, and monitoring with sticky traps. Cultural practices, like sanitation and moisture control, are essential. Chemical control is often necessary, requiring the rotation of different insecticide classes to manage resistance.

• Monitoring: deployment of blue or yellow sticky traps.
• Sanitation: regular weeding and disposal of infested debris.
• Biological Control: use of natural predators like predatory mites and bugs.