Jc. Dickens, Sexual maturation and temporal variation of neural responses in adult Colorado potato beetles to volatiles emitted by potato plants, J CHEM ECOL, 26(5), 2000, pp. 1265-1279
Neural responses of the Colorado potato beetle (CPB), Leptinotarsa decemlin
eata to volatiles emitted by potato plants, Solanum tuberosum L were invest
igated. Amplitudes of electroantennograms to measured amounts of a standard
odorant. (Z)-3-hexenyl acetate, increased from day of emergence through at
least six to eight days of adulthood. Among 20 potato volatiles examined,
several constitutive compounds, e.g., the green leaf volatiles (Z)-3-hexen-
1-ol, (E)-2-hexen-1-ol, and (Z)-3-hexenyl butyrate, and systemic volatiles
released primarily in response to insect feeding, e.g., (+/-)-linalool, non
anal, methyl salicylate, and indole, were the most effective stimuli. A sta
tistic called linens age-skew (linear orthogonal polynomial) was used to ex
amine differences in responses to potato volatiles between young and mature
CPB. Based on plots of linear age-skew and overall neural responsiveness,
10 volatiles could be identified for which responses increased at a rate si
milar to or greater than the standard. The results are discussed with regar
d to the relationship of the CPB to its host plant and developmental studie
s of insect sensory responses to chemical signals.