Evaluation of residue levels of imidacloprid and thiamethoxam after foliar application to the citrus varieties Lane Late, Valencia Late, Rohde Summer, and Nules
Visualitza/Obre
Autor/a
Martínez-Ferrer, María Teresa
Campos-Rivela, José Miguel
Hernando-Guil, María Dolores
García-Valcárcel, Ana Isabel
Data de publicació
2019-08-28ISSN
0022-0493
Resum
Neonicotinoids are used to protect citrus trees against pests. Dissipation and persistence of neonicotinoids in pollen and nectar of citrus trees after foliar applications and their potential exposure to pollinators have not been well characterized. Field studies were conducted using three orange and one mandarin varieties to compare the imidacloprid and thiamethoxam residue levels and their decline in pollen and nectar after treatments in pre-bloom close to flowering period and their persistence 1 yr after treatment. The possible risk to honeybees was assessed. In nectar, thiamethoxam and imidacloprid residues were between 61 and 99% lower than in pollen, depending on the citrus variety or/and the days after treatment when applied close to blooming. At the end of the flowering period, imidacloprid in pollen and nectar was not detected in the mandarin variety after treatment in pre-bloom, whereas for thiamethoxam, no residues were detected in nectar but 10 ng/g was detected in pollen. There were no quantifiable levels of residues for either neonicotinoids in pollen or nectar during the flowering period of the following year. Neonicotinoid residue levels and their decline in nectar and pollen in citrus depended on the timing of applications relative to flowering and on the citrus variety. The absence of neonicotinoid residues 1 yr out after foliar applications in all varieties assayed demonstrated that none of the neonicotinoids tested were persistent. The results could be different in other citrus varieties, and therefore, also the exposure assessment for managed pollinators.
Tipus de document
Article
Versió del document
Versió acceptada
Llengua
English
Matèries (CDU)
632 - Malalties i protecció de les plantes
Pàgines
36
Publicat per
Oxford University Press
Publicat a
Journal of Economic Entomology
Citació
Martínez-Ferrer, María Teresa, José Miguel Campos-Rivela, María Dolores Hernando-Guil, and Ana Isabel García-Valcárcel. 2019. "Evaluation Of Residue Levels Of Imidacloprid And Thiamethoxam After Foliar Application To The Citrus Varieties Lane Late, Valencia Late, Rohde Summer, And Nules". Journal Of Economic Entomology. Oxford University Press (OUP). doi:10.1093/jee/toz231.
Número de l'acord de la subvenció
INIA/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2013-00042-C10-01/ES/Impacto de contaminantes sobre la abundancia y diversidad de polinizadores silvestres y abejas melíferas. Evaluación de efectos sobre el sistema inmunitario y reproductivo. Estudios de campo/
INIA/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2013-00042-C10-04/ES/Estudios de campo del impacto de los neonicotinoides y otros productos fitosanitarios utilizados en fruticultura sobre las poblaciones de abejas/
Programa
Protecció Vegetal Sostenible
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