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Lobesia botrana (Lepidoptera: Tortricidae), the grapevine moth, is one of the major pest on grapes. Current control is based on spraying insecticides and/or mating disruption technique, using female sex pheromone, affecting only adult male’s conduct. Behavioral active compounds as plants kairomones influence the interaction of phytophagous insects with plants, providing chemical cues to feed or lay eggs. Through electroantennography (EAG) and olfactory experiments, we investigated the role of volatiles of the non-host plant Schinus molle L. on behavior of L. botrana. Steam distilled essential oil (EO) from S. molle leaves was characterized by gas chromatography coupled to mass spectrometry (GC-MS). The most abundant compounds were limonene (17.61%), α-phellandrene (14.32%), β-caryophyllene (8.82%) and δ-cadinene (9.39%). Electrical responses of L. botrana at 1×102 μg mL-1 EO were not different from control for females (0.81 mV) and males (1.22 mV). At 1×103 and 1×104 μg mL-1 EO we found a significant increment for females to 1.28 and 1.57 mV, and 1.28 and 1.69 mV for males, respectively. In tube-Y olfactometer, at 1×102 μg mL-1 EO the choice did not differ from the control for females (P = 0.7630) and males (P = 0.4054). Females were attracted to odor source at 1×103 μg mL-1 (P = 0.0043) and at 1×104 μg mL-1 (P = 0.0011). Males were attracted to the dose of 1×103 μg mL-1 (P = 0.0278) and at 1×104 μg mL-1 (P = 0.0017). We found that non-host plant volatiles elicited electrophysiological and behavioral responses and that L. botrana can discriminate between doses.

Behavioral and antennal responses of Lobesia botrana (Lepidoptera: Tortricidae) to volatiles from the non-host plant Schinus molle L. (Anacardiaceae)