This study investigated how fruit morphology and development, especially ostiole openness of young fruit, affect the thrips (Thysanoptera) resistance of various fig (Ficus carica L.) cultivars. The rate of fruits with thrips (TFR) and the damage (DFR) varied among the 24 cultivars surveyed. TFR and DFR were highest in ‘Masui Dauphine’ (syn. ‘San Piero’), a popular cultivar in Japan, and moderate in ‘Brunswick’, ‘Archipel’, and ‘Saint Jean’, but relatively low to almost zero in many other cultivars. Cultivar differences in DFR were correlated with the difference in the rate of ostiole hole (a hole larger than 0.1 mm in diameter towards the internal pulp) presence. However, thrips were also detected from fruits in which no ostiole hole was observed throughout the growing stages, so they are likely to be able to pass through narrower gaps. Of two predicted morphologies determining ostiole openness, i.e., scale loosening around the ostiole surface and obstruction of the ostiole interior by flowers, only the former was correlated with DFR, so that scale loosening in longitudinal and radial directions relative to the ostiole was actually observed. A general linear model (GLM) for likelihood of thrips detection for individual fruits, with cultivar, scale looseness in longitudinal and radial directions, and interactions between both looseness as explanatory variables, had the best fit at 15 days after fruit set. The results showed that fig cultivars with less loosening of several surface scales at around 15 days after fruit set tended to be less susceptible to thrips invasion.

本研究调查了果实形态和发育，特别是幼果的小孔开放度，如何影响各种无花果品种的蓟马（Thysanoptera）抗性。在调查的 24 个品种中，蓟马果实发生率 (TFR) 和损害率 (DFR) 各不相同。日本流行品种“Masui Dauphine”（同义词“San Piero”）的 TFR 和 DFR 最高，“Brunswick”、“Archipel”和“Saint Jean”的 TFR 和 DFR 适中，但许多品种的 TFR 和 DFR 相对较低，几乎为零。其他品种。 DFR 的品种差异与小孔孔（朝向内部牙髓直径大于 0.1 毫米的孔）存在率的差异相关。然而，在整个生长阶段都没有观察到小孔的水果中也检测到了蓟马，因此它们很可能能够通过较窄的间隙。在决定小孔开放度的两种预测形态中，即小孔表面周围的鳞片松动和花朵对小孔内部的阻塞，只有前者与 DFR 相关，因此实际上观察到相对于小孔的纵向和径向方向的鳞片松动。用于单个水果检测蓟马的可能性的一般线性模型 (GLM)，以品种、纵向和径向的鳞片松散度以及两种松散度之间的相互作用作为解释变量，在坐果后 15 天时最适合。结果表明，在坐果后 15 天左右，几个表面鳞片松动较少的无花果品种往往不易受到蓟马入侵。