Journal of Economic Entomology (2007) 100, 1637-1641

Stefano Civolani, Riccardo Peretto, Luigi Caroli, Edison Pasqualini, Milvia Chicca and Marilena Leis (2007)
Preliminary resistance screening on abamectin in pear psylla (Hemiptera: Psyllidae) in northern Italy
Journal of Economic Entomology 100 (5), 1637-1641
Abstract: In northern Italy (Emilia-Romagna region), integrated pest management has been used for several years against pear psylla, Cacopsylla pyri L. (Hemiptera: Psyllidae), a relevant pest of pear (Pyrus spp.) trees. After the outlawing of amitraz in 2005, the most common active ingredient involved is abamectin, a mixture of avermectin B_1a and avermectin B_1b. After the development of C. pyri resistance to azinphos methyl in southern France, we evaluated, by topical application, the different sensitivities to abamectin on C. pyri populations collected in orchards from Emilia-Romagna, where different field strategies were used, with alternative success in terms of pest management. The LC₅₀ values ranged between 1.61 and 28.37 mg/liter, and they revealed variations more related to collection time than to field strategies. The failure of abamectin treatments against C. pyri in some Emilia-Romagna locations is probably unrelated to resistance development, but rather it is related to incorrect pest defense management, which could interfere with pest parasitoids and predators.
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Database assignments for author(s): Marilena Leis, Stefano Civolani, Edison Pasqualini

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Cacopsylla pyri	Pear (Pyrus)	Italy