Abstract
Most Nicotiana species have multicellular, glanded leaf trichomes which may produce chemical secretions containing diterpenes and/or sugar esters with C2 to C10 acyl moieties. These components affect tobacco aphids, Myzus nicotianae Blackman, in several ways, including influencing the acceptance or rejection of plants for colonization by alate migrant aphids, and the survival and fecundity of alate and apterous aphids. Cuticular diterpenes and sucrose esters were isolated from the cuticular extracts of aphid resistant and susceptible N. tabacum genotypes. These compounds were applied topically to the backs of apterous aphids. LC50's (dose per aphid which kills 50% of the test population after 48 hrs.) of the isolates were; α- and β-4,8,13-duvatriene-l,3-diols, 15.7 μg; α- and β-4,8,13-duvatrien-l-ols, 6.4 μg; cis-abienol, 7.5 μg; sucrose esters (6-O-acetyl-3,3,4-tri-O-acylsucrose with C3 to C7 acyl groups), 0.25 μg; and cis-abienol plus α- and β-4,8,13-duvatrien-1-ols (1:3), 6.0 μg.
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