Journal of Economic Entomology (2018) 111, 844-852

Dolors Bosch, Marcela A. Rodríguez, Laura Depalo and Jesús Avilla (2018)
Determination of the baseline susceptibility of European populations of Cydia pomonella (Lepidoptera: Tortricidae) to chlorantraniliprole and the role of cytochrome P450 monooxygenases
Journal of Economic Entomology 111 (2), 844-852
Abstract: The codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), is the key pest on pome fruit and walnut orchards worldwide. Its resistance to available insecticides has been widely reported. Chlorantraniliprole is an anthranilic diamide that was introduced in European countries in 2008–2009 and acts by activating the insect's ryanodine receptors. The aims of this study were to determine the baseline susceptibility of European populations of C. pomonella to chlorantraniliprole, to establish the discriminant concentrations (DC) to check the possible development of resistance, and to know the role of cytochrome P450 monooxygenases (P450) in the possible susceptibility decrease of field populations to the insecticide. Ten field populations from Spain along with others were used to calculate the baseline response of larvae to chlorantraniliprole incorporated into the diet. A pooled probit line was calculated, and three DC were established: 0.3 mg a.i./kg (close to the LC₅₀), 1.0 mg a.i./kg (close to the LC₉₀), and 10 mg a.i./kg diets (threefold the LC₉₉). The DC were used to test the susceptibility of 27 field populations from France, Germany, Hungary, Italy, and Spain. The corrected mortality observed in all cases ranged within the expected interval, even with Spanish populations that showed between 12.1 and 100.0% of individuals with high P450 activity. However, the mortality caused by the DC_0.3 decreased as the mean P450 activity increased. Field populations resistant to other insecticides were susceptible to chlorantraniliprole. The determined baseline codling moth susceptibility is a valuable reference for tracking possible future alterations in the efficacy of the insecticide.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Laura Depalo, Jesús Avilla, Dolors Bosch

Research topic(s) for pests/diseases/weeds:
control - general
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cydia pomonella		France
	Cydia pomonella		Germany
	Cydia pomonella		Hungary
	Cydia pomonella		Italy
	Cydia pomonella		Spain (continental)