Effect of genotypes of Lycoperscon spp. with different amounts of allelochemicals on Phthorimaea operculella (Zell.)

Abstract

This research was carried out to study the resistance of L. hirsutum f. glabratum, line PI 134417, to the leafrniner P. operculella and the relative importance of the allelochemicals 2-tridecanone (2-T) and 2-undecanone (2-U) in the manifestation of this resistance. The biology of P. operculella was studied in leaves of L. esculentum (P,), L. hyrsutum f. glabratum (P2 ), 20 hybrids [(P, X P2) X %], and L. hirsutum f, glabratum that had the glandular exsudates removed. The amounts of allelochemicals 2-T and 2-U were determined in the genotypes. It was concluded that there are quantitatively factors conditioning resistance in the exsudates of glandular trichomas that contain 2~T and 2-U, and in other parts of the leaves of L. hirsutum f. glabratum. The resistance conditioned by glandular exsudates affects larval development at early larval stages. Resistance caused by other factors present in the leaves are more obvious at the end of larval phase, in pupae and adults.