Effect of pupation environment on pupal development and eclosion of chilli thrips (Thysanoptera: Thripidae).

This article focuses on the effects of soil type, soil water content, and temperature on the pupal development and eclosion of chilli thrips (Scirtothrips dorsalis Hood), a major pest affecting fruit and vegetable production in Hainan Province, China. The study found that both low (1%) and high (15%) soil water contents negatively impact pupation and eclosion, with optimal eclosion rates occurring at moderate soil moisture levels (3–5%) depending on soil type, particularly clay soil. Temperature also influenced development, with higher temperatures (28–32°C) shortening pupal duration and increasing eclosion rates. Additionally, chilli thrips were capable of pupating and emerging in soil-less environments such as mango leaves, stalks, plastic mulch, and weed fabric, though with generally lower eclosion rates than optimal soil conditions. The findings suggest that pest management strategies should consider ground-layer conditions, including soil moisture, alongside canopy-targeted controls to improve effectiveness.