Frankliniella occidentalis causes significant damage to berry crops in Mexico. Traps may be used for monitoring or mass‐trapping thrips populations. Generally, colour traps are used for monitoring thrips, but sometimes a chemical stimulus can be added to the traps. However, there is conflicting information about what colour is the most attractive and efficient for capturing F. occidentalis. In this study, we first evaluated six colours of adhesive traps for catching F. occidentalis in blackberries grown in tunnels or in an open field. Subsequently, using the most attractive trap colour, we assessed the biological activity of neryl (S)‐2‐methylbutanoate and (R)‐lavandulyl acetate, components of the pheromone aggregation of F. occidentalis. Finally, we examined the effect of neryl (S)‐2‐methylbutanoate dosage rates on the number of captured thrips. We found that blue (tunnel) and yellow (open field) followed by violet traps captured a significantly greater number of F. occidentalis compared with the white, black and green traps. Our results confirm that neryl (S)‐2‐methylbutanoate is the only component necessary for enhancing the performance of coloured traps. Blue and yellow traps baited with 200–400 µg of neryl (S)‐2‐methylbutanoate increased the capture 2.5–3 times compared to unbaited traps. In all experiments, traps captured more females than males in blackberries grown in tunnels, whereas the opposite was found in blackberries cultivated in the open field. These results constitute the first step in the development of a monitoring system for F. occidentalis in soft fruit crops in Mexico.

中文翻译：

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诱捕颜色和聚集信息素剂量对黑莓作物西花蓟马捕获量的影响

Frankliniella occidentalis 对墨西哥的浆果作物造成严重损害。陷阱可用于监测或大量捕获蓟马种群。通常，颜色陷阱用于监测蓟马，但有时可以将化学刺激添加到陷阱中。然而，关于哪种颜色对捕获 F. occidentalis 最有吸引力和最有效，存在相互矛盾的信息。在这项研究中，我们首先评估了六种颜色的粘合剂陷阱，用于在隧道或开阔地种植的黑莓中捕获 F. occidentalis。随后，我们使用最具吸引力的陷阱颜色评估了 (S)-2-甲基丁酸橙花酯和 (R)-醋酸薰衣草酯的生物活性，它们是 F. occidentalis 信息素聚集的成分。最后，我们检查了橙花酯 (S)-2-甲基丁酸酯剂量率对捕获的蓟马数量的影响。我们发现，与白色、黑色和绿色陷阱相比，蓝色（隧道）和黄色（开阔地）和紫色陷阱捕获的 F. occidentalis 数量明显更多。我们的结果证实，(S)-2-甲基丁酸橙花酯是提高有色陷阱性能所必需的唯一成分。用 200–400 µg (S)-2-甲基丁酸橙花酯作为诱饵的蓝色和黄色诱捕器与未诱捕的诱捕器相比，捕获量增加了 2.5–3 倍。在所有实验中，陷阱在隧道中种植的黑莓中捕获的雌性多于雄性，而在露天种植的黑莓中发现的情况正好相反。这些结果构成了开发墨西哥软果作物中 F. occidentalis 监测系统的第一步。