Abstract
In this paper we analysed the basis of insecticide resistance in 59 Italian strains of the peach potato aphid Myzus persicae using both
molecular and biochemical assays. Our data as a whole clearly indicate that most M. persicae strains (76.3%) have high or extremely high
production of an esterase enzyme which sequester and detoxify insecticides with esteric group. Kdr genotypes conferring resistance
towards pyrethoids are present in 57.7% of the analysed populations. Moreover, 26.5% of the kdr positive strains possess also the
M918T mutation conferring super-kdr phenotype. Strains with modified AChE (MACE) are not so numerous (27.1%), although they
can be found almost everywhere in Italy. Considering all the strains analysed, both MACE and kdr phenotypes are associated with high
levels of esterase activity. In Central–Southern regions, kdr and MACE resistance mechanisms resulted in linkage disequilibrium. Bioassays
performed in order to evaluate the efficacy of a pyrethroid insecticide against a strain possessing a F979S mutation within its paratype
sodium channel gene suggests that this amino acid substitution could affect the sodium channel responsivity to pyrethroids.
Lingua originale | English |
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pagine (da-a) | 168-174 |
Numero di pagine | 7 |
Rivista | Pesticide Biochemistry and Physiology |
Volume | 90 |
DOI | |
Stato di pubblicazione | Pubblicato - 2008 |
Keywords
- Myzus persicae
- insecticide resistance
- kdr resistance
- pyrethroids
- sodium channel