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Oviposition and feeding of  Scrobipalpuloides absoluta  was studied on plants of seven different genotypes with varying 2-tridecanone (2-TD) foliage concentrations:  Lycopersicon esculentum  var.  glabratum  PI 1344417 (GLA),  L. esculentum  TSWV-547 (ESC), F1 (ESC × GLA), and four F 2  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 × 10 –12  mol·cm 2 , while ESC, LO1 and LO2 had 2-TD below 40 × 10 –12  mol·cm 2 ; F1 had intermediary levels of 2-TD (83.5 × 10 –12  mol 2-TD/cm 2 ). Ovipositioning was substantially higher in the low 2-TD than on either the high 2-TD genotypes or in the F 1 , especially in the upper portion of the plants. Scores for leaf lesion type (LLT), overall plant damage (OPD) and percent leaflets attacked (PLA) were substantially higher for the low 2-TD than for either the high 2-TD genotypes or the F 1 . The results indicate that 2-TD mediates resistance to  Scrobipalpuloides absoluta  in the interspecific cross, and strongly suggest that 2-TD acts as both an ovipositioning and feeding deterrent for this insect.

hortscience

2-Tridecanone-mediated Mechanisms of Resistance to the South American Tomato Pinworm Scrobipalpuloides absoluta (Meyrick, 1917) (Lepidoptera-Gelechiidae) in Lycopersicon spp.