CRUB-UNCoMA, Quintral 1250 (8400) S.C. de Bariloche-Río Negro, Argentina.
IFAB (INTA-CONICET) EEA-Bariloche, Modesta Victoria 4450 (8400), S.C. de Bariloche- Río Negro, Argentina.
J Econ Entomol. 2019 Dec 9;112(6):2649-2654. doi: 10.1093/jee/toz190.
Several species of grasshoppers are attracted to vegetable oils. These oils have kairomonal properties mainly due to the presence of linolenic and linoleic fatty acids. This study aimed to determine whether the odors of canola, flax, and olive oils are attractive to Dichroplus vittigerum (Blanchard 1851) and if they induce preference and feeding. We conducted three bioassays to determine whether oil modifies attraction and feeding behavior of this grasshopper. We first determined the attraction of the oils using a wind tunnel, secondly evaluated phagostimulation produced by the oils, and finally performed preference tests comparing consumption of Taraxacum officinale (Weber ex F.H.Wigg. 1780, Asterales: Asteraceae) leaves treated with the oils versus control leaves. Even though all of the oils induced attraction, only flax oil acted as a phagostimulant. However, the oils did not determine the preference and did not increase feeding on leaves. We hypothesize that T. officinale leaves are inherently attractive and treatment with oils did not affect feeding on them. Our results provide a starting point to develop baits that can be used to attract and control these harmful insects, presenting flax oil as a potential bait for D. vittigerum since its odor was both attractive and led to increased feeding or phagostimulation. Future studies should test the effect of the oils on other plant species or at varying doses, under field conditions.
几种蝗虫对植物油具有趋性。这些油具有信息素特性，主要是由于存在亚麻酸和亚油酸脂肪酸。本研究旨在确定油菜籽、亚麻和橄榄油的气味是否对 Dichroplus vittigerum（Blanchard 1851）有吸引力，以及它们是否诱导偏好和取食。我们进行了三项生物测定，以确定油是否会改变这种蝗虫的取食行为。我们首先使用风洞确定油的吸引力，其次评估油产生的取食刺激，最后通过比较用油处理的 Taraxacum officinale（Weber ex F.H.Wigg. 1780，Asterales：Asteraceae）叶片与对照叶片的消耗来进行偏好测试。尽管所有油都能诱导吸引力，但只有亚麻籽油能作为取食刺激物。然而，油并没有决定偏好，也没有增加对叶片的取食。我们假设 T. officinale 叶片本身具有吸引力，用油处理不会影响对它们的取食。我们的结果为开发可以吸引和控制这些有害昆虫的诱饵提供了一个起点，因为亚麻籽油的气味既具有吸引力又能增加取食或取食刺激，因此它是 D. vittigerum 的潜在诱饵。未来的研究应该在田间条件下，测试油对其他植物物种或不同剂量的影响。
