Abstract
The apple rosy aphid, Dysaphis plantaginea (Passerini), is a serious pest in pome orchards.
Insecticide applications of to reduce damages are usually a need and are based on pre- and / or
post-flowering treatments. The secondary host of this aphid has no agricultural interest so,
differently from other species like Myzus persicae (Sulzer) and Aphis gossypii Glover the
summer generations are not treated.
This lower selection pressure is certainly the main reason for the quite rare reports of
resistance in D. plantaginea. However, following specific control failure reports, it was
considered wise to make a preliminary survey on the activity of enzymatic systems of D.
plantaginea, that in other aphid species are known to be involved in insecticide resistance. In
spring 2008 two populations of D. plantaginea were collected: the first in a commercial
orchard with insecticide control failures, the second from an apple tree in an untreated garden
far away from commercial fruit orchards.
Spectrophotometric and fluorimetric techniques have been used to measure the activity of the
following enzymatic systems: esterases, glutathione S-transferases, monooxygenases and
acetylcholinesterases.
Preliminary results indicate that between the two populations:
• there are no significant differences in the activity total esterase;
• also the activity of glutathione S-transferase is very similar;
• acetylcholinesterase is inhibited equally in the presence of a dimethycarmabate diagnostic
concentration that in M. persicae can distinguish among resistant than sensitive specimens;
• there are differences in monooxygenase activity: such activity is higher in the specimens
from the population that survived the treatments.
These observations are consistent with literature data obtained on some French populations
several years ago. Further investigations will be needed to clarify the role played by
monooxygenases in the sporadic cases reported of treatment efficacy reduction
| Lingua originale | English |
|---|---|
| Titolo della pubblicazione ospite | Abstract book of the IOBC Meeting "Sustainable protection of fruit crops in the Mediterranean area" |
| Pagine | 43 |
| Numero di pagine | 1 |
| Stato di pubblicazione | Pubblicato - 2011 |
| Evento | Sustainable protection of fruit crops in the Mediterranean area - Vico del Gargano Durata: 12 set 2010 → 17 set 2010 |
Convegno
| Convegno | Sustainable protection of fruit crops in the Mediterranean area |
|---|---|
| Città | Vico del Gargano |
| Periodo | 12/9/10 → 17/9/10 |
Keywords
- afidi
- enzimi
- melo
- resistenza agli insetticidi