2-Tridecanone-mediated mechanisms of resistance to the South American tomato pinworm Scrobipalpuloides absoluta (Meyrick, 1917) (Lepidoptera-Gelechiidae) in Lycopersicon spp.

2-Tridecanone-mediated mechanisms of resistance to the South American tomato pinworm Scrobipalpuloides absoluta (Meyrick, 1917) (Lepidoptera-Gelechiidae) in Lycopersicon spp.

1997

A:PS

Oviposition and feeding of Scrobipalpuloides absoluta [Tuta absoluta] was studied on plants of seven different genotypes with varying 2-tridecanone (2-TD) foliage concentrations: Lycopersicon hirsutum var. glabratum PI134417 (= GLA), L. esculentum TSWV-547 (= ESC), F1 (ESC x GLA), and 4 F2 genotypes, two with high 2-TD (HI1, HI2), and two with low foliage 2-TD concentrations (LO1, LO2). GLA, HI1 and HI2 showed 2-TD concentrations above 185 x 10-12 moles/cmsuperscript 2, while ESC, LO1 and LO2 had 2-TD levels below 40 x 10-12 moles/cmsuperscript 2; the F1 had intermediary levels of 2-TD (83.5 x 10-12 moles 2-TD/cmsuperscript 2). Ovipositioning was substantially higher in the low 2-TD than on either the high 2-TD genotypes or in the F1, especially in the upper portion of the plants. Scores for leaf lesion type, overall plant damage and percentage leaflets attacked were substantially higher for the low 2-TD than for either the high 2-TD genotypes or the F1. The results indicate that 2-TD mediates resistance to S. absoluta in the interspecific cross, and strongly suggest that 2-TD acts as both an ovipositioning and feeding deterrent for this insect.

93(2):189-194, EUPHYTICA

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