Identification of Resistance Mechanisms in a Selected Laboratory Strain of Cacopsylla pyri (Homoptera: Psyllidae): Altered Acetylcholinesterase and Detoxifying Oxidases

Berrada, S.; Fournier, Didier; Cuany, A.; Nguyen, T. X.

doi:10.1006/pest.1994.1005

Cited by 35 publications

(43 citation statements)

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“…No PBO‐inhibiting activity was observed in the laboratory strain. In the present results, the PBO‐inhibiting effect took place particularly with regard to deltamethrin, whereas Berrada (1994) observed the synergizing effect of PBO on monocrotophos and their biochemical analyses confirmed the presence of mixed‐function oxidases, but these authors used a strain selected with this insecticide for 30 generations. A result similar to the present study was observed by Van De Baan (1988) on P. pyricola in Oregon, where synergism was observed only for fenvalerate.…”

Section: Discussioncontrasting

confidence: 58%

Geographic and seasonal variability of resistance to insecticides in Cacopsylla pyri L. (Hom., Psyllidae)

Bues

Boudinhon

Toubon

et al. 1999

J Applied Entomology

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Pear psylla (Cacopsylla pyri L.) resistance to insecticides was studied in adults using the topical application method. In the Avignon population, the winter forms tested (diapausing generation) showed a greater tolerance to insecticide than the summer forms. High resistance rates, ranging from 25‐ to 180‐fold, were observed for three organo‐phosphorous insecticides. Resistance rates were seven times lower for pyrethrinoids and amitraz and practically nil for carbamates. Inter‐population resistance rates, for an identical period, were different for the three organo‐phosphorous insecticides and for deltamethrin in two localities. However, it was difficult to make comparisons in time due to seasonal variations. Rates of synergism by S,S,S‐tributyl phosphorotrithioate (DEF) and piperonyl butoxide (PBO) were low when applied 4 h before the insecticide (0.3‐ to 3.3‐fold), except for deltamethrin with PBO (>60‐fold). The presence of mixed‐function oxidases in winter forms is discussed with regard to bibliographical data concerning another psylla species from North America (Psylla pyricola Foerster).

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Section: Discussioncontrasting

confidence: 58%

Geographic and seasonal variability of resistance to insecticides in Cacopsylla pyri L. (Hom., Psyllidae)

Bues

Boudinhon

Toubon

et al. 1999

J Applied Entomology

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“…PBO is known to inhibit overproduction of cytochrome P450 monooxygenases involved in insecticide resistance, as found in deltametrin or monocrotophos-resistant C. pyri populations in France (Berrada et al 1994, Buè s et al 2003. Our data show no signiÞcant synergic effects in the C. pyri populations tested.…”

Section: Discussionmentioning

confidence: 99%

Survey of Susceptibility to Abamectin of Pear Psylla (Hemiptera: Psyllidae) in Northern Italy

Civolani¹,

Cassanelli²,

Rivi³

et al. 2010

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The pear psylla, Cacopsylla pyri L. (Hemiptera: Psyllidae), is a relevant pest of pear, Pyrus communis L., trees in Emilia-Romagna region (northern Italy). The susceptibility to the insecticide abamectin was evaluated at different times of the year on C. pyri populations undergoing different control strategies within conventional, integrated, and organic farms. The tests performed were the egg spray and the topic and dip bioassay on adults. The larval mortality was evaluated by dip bioassay on treated leaves. The activity of P450-dependent monooxygenases, a relevant enzyme system involved in insecticide resistance of C. pyri, was also determined in adults by 7-ethoxycoumarin O-deethylation (ECOD assay). Tests on treated eggs and on larvae showed no significant differences in LC50 and LC90, although these values were always lower in individuals collected from organic farms in comparison with all other farms. Tests on overwintering adults revealed differences among populations, probably more related to collection time than to field pest control strategies. Unexpectedly, the ECOD assay on adults showed a slightly higher cytochrome P450 monooxygenase activity in the population undergoing organic control in comparison to others. Our results indicate that egg spray is the most reliable bioassay to verify data of open-field applications. Apparently, no resistance to abamectin has yet been developed by C. pyri in Emilia-Romagna.

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“…ingredient were the enhanced activity of cytochrome P450 monooxygenase (MFO) and also the changes in acetyl cholinesterase, since the susceptibility to the pesticide could not be fully recovered by pretreating in vivo the adults with piperonylbutoxide (PBO), a specific inhibitor of MFO (Berrada et al, 1994). In 1994 in the Avignon region (France) the survey for C. pyri resistance was extended to 16 active ingredients belonging to five pesticide families, by topical laboratory tests on adults (Fig.…”

Section: Evolution Of Resistance Of C Pyri To Pesticidesmentioning

confidence: 99%

The Past and Present of Pear Protection Against the Pear Psylla, Cacopsylla pyri L.

Civolani¹

2012

Insecticides - Pest Engineering

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Identification of Resistance Mechanisms in a Selected Laboratory Strain of Cacopsylla pyri (Homoptera: Psyllidae): Altered Acetylcholinesterase and Detoxifying Oxidases

Cited by 35 publications

References 0 publications

Geographic and seasonal variability of resistance to insecticides in Cacopsylla pyri L. (Hom., Psyllidae)

Geographic and seasonal variability of resistance to insecticides in Cacopsylla pyri L. (Hom., Psyllidae)

Survey of Susceptibility to Abamectin of Pear Psylla (Hemiptera: Psyllidae) in Northern Italy

The Past and Present of Pear Protection Against the Pear Psylla, Cacopsylla pyri L.

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