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<p>This study investigated whether the decision of thrips to invade fig (<i>Ficus carica</i> L.) fruits involves a preference for fruit age, in addition to the development of the ostiole opening. It is known that the ostiole of tested ‘Masui Dauphine’ (syn. ‘San Piero’) fig fruits opens widely from a young age and is thus often damaged by the thrips. In 2021, when young fruit of various sizes on basal nodes of the shoots were halved lengthwise, thrips were detected only in the fruits wider than 28–&lt; 38&#xa0;mm range in width (age estimated 19–26&#xa0;days after fruit set), but not in fruits smaller (younger) than that, even when the ostioles opened enough to allow entry. In 2024, the ostioles of young fruits of various sizes growing at the same time were first sealed with wood glue, artificially opened for 5&#xa0;days at different developmental stages by boring a hole, and then resealed. There was a peak in the rate of thrips detection in the fruits held open at age estimated 19–26&#xa0;days after fruit set. These results suggest that thrips prefer to invade fig fruits 3–4 weeks after fruit set, and ignore both younger and older fruits, even if their ostioles are morphologically passable. Thrips detected in older fruits were considered to have invaded during a prior prefer period and their offspring.</p>

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Thrips (Thysanoptera: Thripidae) prefer a certain age of fig fruits for invasion

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Akihiro Hosomi

摘要

This study investigated whether the decision of thrips to invade fig (Ficus carica L.) fruits involves a preference for fruit age, in addition to the development of the ostiole opening. It is known that the ostiole of tested ‘Masui Dauphine’ (syn. ‘San Piero’) fig fruits opens widely from a young age and is thus often damaged by the thrips. In 2021, when young fruit of various sizes on basal nodes of the shoots were halved lengthwise, thrips were detected only in the fruits wider than 28–< 38 mm range in width (age estimated 19–26 days after fruit set), but not in fruits smaller (younger) than that, even when the ostioles opened enough to allow entry. In 2024, the ostioles of young fruits of various sizes growing at the same time were first sealed with wood glue, artificially opened for 5 days at different developmental stages by boring a hole, and then resealed. There was a peak in the rate of thrips detection in the fruits held open at age estimated 19–26 days after fruit set. These results suggest that thrips prefer to invade fig fruits 3–4 weeks after fruit set, and ignore both younger and older fruits, even if their ostioles are morphologically passable. Thrips detected in older fruits were considered to have invaded during a prior prefer period and their offspring.