Screening of essential oil antifeedants in the elm pest Ambrostoma quadriimpressum (Coleoptera: Chrysomelidae)
Keywords:
insect antifeedant, electroantennogram, olfactometerAbstract
The leaf beetle Ambrostoma quadriimpressum Motschulsky (Coleoptera: Chrysomelidae) is a major pest of elm (Ulmus; Rosales: Ulmaceae) in eastern Asia, and there is currently no effective, environmentally friendly, chemical method for its control. In this study, we measured A. quadriimpressum adults’ electrophysiological and behavioral responses to 13 compounds, including 6 plant volatiles (linalool, α-pinene, methyl salicylate, indole, di-n-octyl phthalate, dimethyl naphthalene), 4 semiochemicals (benzyl alcohol, cinnamaldehyde, 1-undecene, anethol) known to elicit responses in closely related species, 2 pungent odorants (methanol, phenol), and 1 analogue (ethyl salicylate) of an elm volatile. Female leaf beetles were highly responsive to phenol and methanol, whereas male beetles responded to di-n-octyl phthalate and dimethyl naphthalene at a concentration of 10 μg/μL. Cinnamaldehyde elicited the highest electroantennogram responses in both male and female beetles. In screenings of semiochemicals, beetles of both sexes were significantly repelled by cinnamaldehyde at 1 μg/μL. In Y-tube olfactometer tests, beetles of both sexes were significantly repelled by cinnamaldehyde, at 1 μg/μL for females and 10 μg/μL for males. In choice tests, 90% of starved beetles chose control leaves over leaves treated with cinnamaldehyde at 10 μg/μL. These results suggest that cinnamaldehyde has potential value for control of this elm pest, acting as an antifeedant compound.
Resumen
El escarabajo de la hoja Ambrostoma quadriimpressum Motschulsky (Coleoptera: Chrysomelidae) es una plaga importante del olmo (Ulmus; Rosales: Ulmaceae) en Asia oriental, y actualmente no existe ningún método químicos para su control que es eficaz y respetuoso del medio ambiente. En este estudio, se midió la respuesta electrofisiológica y de comportamiento de adultos de A. quadriimpressum a 13 compuestos, incluyendo 6 volátiles de plantas (linalool, α-pineno, salicilato de metilo, indol, ftalato de di-n-octilo, dimetil naftaleno), 4 semioquímicos (bencilo alcohol, cinamaldehído, 1-undeceno, anetol) conocido para provocar respuestas en especies estrechamente relacionadas, 2 olores acres (metanol, fenol), y 1 analógica (salicilato de etilo) de un volátil de olmo. Las hembras de los escarabajos de las hojas fueron muy sensibles a fenol y metanol, mientras que los escarabajos machos respondieron a ftalato de di-n-octilo y naftaleno de dimetilo a una concentración de 10 g/l. El cinamaldehído provocó la mayor respuesta EAG en los escarabajos machos y hembras. En pruebas de detección de semioquímicos, escarabajos de ambos sexos fueron repelados de manera significativa por cinamaldehído a 1 mg/l. En las pruebas olfactometer Y-tubo, los escarabajos de ambos sexos fueron repelados de manera significativa por cinamaldehído, a 1 mg/l para las hembras y 10 mg/l para los machos. En las pruebas de escoger, el 90% de los escarabajos hambrientos escogieron las hojas de control sobre los tratados con cinamaldehído a 10 mg/l. Estos resultados sugieren que cinamaldehído tiene un valor potencial para el control de esta plaga del olmo, que actúa como un compuesto contra la alimentación.
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