Ginkgo thrips

Systematic position. The ginkgo thrips (Scirtothrips ginkgoe) belongs to the order Thysanoptera and the family Thripidae. It is a highly specialized insect species that has co-evolved with its host plant, the Ginkgo biloba, which is a unique and ancient tree species often found in urban landscaping and botanical collections.

Host plants and economic impact. The primary and sole host for this thrips species is the Ginkgo biloba. While the tree is generally resistant to many pests, Scirtothrips ginkgoe can cause significant damage in nursery settings and landscape plantings, leading to the devaluation of the plant's aesthetic appeal, which is its main utility in urban environments.

Biology and life cycle. The life cycle involves several stages: egg, two larval instars, prepupa, pupa, and adult. The development rate is highly dependent on environmental factors, particularly temperature and humidity. Multiple generations can occur during a single growing season, allowing populations to build up rapidly during warm summer months.

Nature of damage. These pests feed by piercing the surface of young leaves and succulent shoots to extract plant cell contents. This feeding pattern causes the leaves to develop characteristic silvery-white mottling, necrotic spots, and severe curling. In heavy infestations, the overall growth of the tree may be stunted, and the damaged foliage often undergoes premature senescence.

Protection measures. Effective control requires a proactive strategy focused on prevention and early intervention. Recommended management practices include:

• Regular inspections of young leaves during the peak growing season.
• Application of systemic insecticides that are absorbed by the leaf tissue to reach the feeding insects.
• Use of horticultural oils or soaps to reduce initial populations.
• Maintaining healthy growth conditions to help trees tolerate minor infestations.
• Sanitation practices, such as removing heavily infested shoots to reduce local populations.