BACKGROUNDThe olive fruit fly (OFF), Bactrocera oleae (Rossi), is the main insect pest of olive trees worldwide. Legislation limits to the use of some synthetic larvicidal insecticides is leading to the development of new control options for preventive control of adult flies. In the present study, the biological activity of four short‐chain aliphatic aldehydes, namely hexanal, (E)‐2‐hexenal, heptanal and (E)‐2‐heptenal, previously reported as repellents to the OFF adults was investigated.RESULTSElectroantennography (EAG) recordings showed that antennae of OFF males and females are able to perceive the test compounds in a wide range of doses. In field trapping experiments, reservoir‐type polypropylene (PP) membrane dispensers loaded with individual compounds did not elicit a significant attraction of OFF males and females. On the contrary, a significant reduction of male catches was noticed when sex pheromone dispensers and PP membrane dispensers, loaded with one of the test compounds, were applied on the same white sticky traps ≈20 cm apart. Likewise, male and female catches in yellow sticky traps baited with ammonium carbonate (AC) dispensers as food attractant were significantly reduced by the presence of PP membrane dispensers of individual aliphatic aldehydes on the same traps. In small plots control trials, solid formulations of the four aldehydes into a bentonite clay support induced a significant reduction of the OFF active infestation mainly when C6 and C7 aldehyde‐activated bentonites were used.CONCLUSIONShort‐chain aliphatic aldehydes showed inhibitory effects on sex pheromone and food attractant‐mediated attraction of OFF. Results of field trials suggest potential of short‐chain aliphatic aldehydes to develop new semiochemical‐based OFF control options. © 2024 Society of Chemical Industry.

中文翻译：

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一些短链脂肪醛对橄榄果蝇信息素和碳酸铵介导的吸引力的抑制活性


背景橄榄果蝇（OFF），Bactrocera oleae（Rossi），是全世界橄榄树的主要害虫。对某些合成杀幼虫剂的使用进行限制的立法正在导致针对成蝇预防性控制的新控制方案的开发。在本研究中，研究了四种短链脂肪醛的生物活性，即己醛、(E)-2-己烯醛、庚醛和(E)-2-庚烯醛，先前报道为 OFF 成虫的驱避剂。 EAG）记录表明，OFF 雄性和雌性的触角能够感知各种剂量的测试化合物。在田间诱捕实验中，装有单个化合物的储层型聚丙烯（PP）膜分配器并未对 OFF 雄性和雌性产生显着的吸引力。相反，当将装有一种测试化合物的性信息素分配器和PP膜分配器应用于相距约20厘米的相同白色粘性捕集器时，发现雄性捕获量显着减少。同样，在用碳酸铵（AC）分配器作为食物引诱剂的黄色粘性诱捕器中，雄性和雌性捕获物由于在同一诱捕器上存在单独的脂肪醛的PP膜分配器而显着减少。在小地块对照试验中，在膨润土载体中加入四种醛的固体制剂，主要是在使用 C6 和 C7 醛激活膨润土时，显着减少了 OFF 活性侵染。 结论 短链脂肪醛对性信息素和性信息素表现出抑制作用。食物引诱剂介导的 OFF 吸引力。现场试验结果表明，短链脂肪醛有潜力开发新的基于化学信息素的 OFF 控制方案。 © 2024 化学工业协会。