citrifolia, the host plant of Drosophila sechellia. It is known that octanoic acid is toxic for many
insect species. The possible relation between structure and toxic activity was compared in
both species. Among fatty acids with 4 to 10 carbons, a stronger toxicity of the 8-carbon
chain length was observed for D. melanogaster flies. Aldehydes and ethylic esters are much
less toxic than the corresponding acids. Alcohols with similar chain lengths are also highly …