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2 resultados encontrados para: AUTOR: Chavarrieta, Juan Manuel
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1.
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Insecticide resistance of adults and nymphs of Asian citrus psyllid populations from Apatzingán Valley, Mexico
Pardo, Saúl ; Martínez, Ana Mabel (coaut.) ; Figueroa, José Isaac (coaut.) ; Chavarrieta, Juan Manuel (coaut.) ; Viñuela Sandoval, Elisa (coaut.) ; Rebollar Alviter, Ángel (coaut.) ; Miranda Salcedo, Mario A. (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Pineda, Samuel (coaut.) ;
Contenido en: Pest Management Science Vol. 74, no. 1 (January 2018), p. 135-140 ISSN: 1526-498X
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Resumen en: Inglés |
Resumen en inglés

Background: Control of the Asian citrus psyllid Diaphorina citri Kuwayama, the most important pest of citrus worldwide, is based on the use of insecticides, though unsatisfactory results have recently been reported. In this study, insecticide resistance of D. citri to three insecticides (bifenthrin,malathion, and chlorpyrifos) was examined. Results: Three populations (designated Dci-CParácuaro, Dci-El Junco, and Dci-Antúnez) of both adults and fourth-instar D. citri individuals were collected in 2014 at two different times and on one occasion, respectively, from three locations (Crucero de Parácuaro, El Junco, and Antúnez). These locations represent the major commercial Mexican lemon production areas in the Apatzingán Valley in the state of Michoacán, Mexico. The three populations of D. citri adults and fourth-instar nymphs at the different collection times showed low levels of resistance (≤7-fold) to bifenthrin, but were very resistant to malathion (≤345- and≤432-fold for adults and fourth instars, respectively) and chlorpyrifos (≤2435- and≤1424-fold for adults and fourth instars, respectively). Conclusion: Resistance levels to the tested insecticideswere highly variable but homogeneous among seasons and localities. Resistance management programmes that include crop sanitation, use of biological and cultural control practices, and rotation of insecticide classes should be established, particularly in areas where D. citri has developed resistance to malathion and chlorpyrifos.


2.
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Natural parasitism of Diaphorina citri (Hemiptera: Psyllidae) collected from two host plants in the apatzingán valley, Mexico, by Tamarixia radiata (Hymenoptera: Eulophidae)
Pardo, Saúl ; Martínez, Ana Mabel (coaut.) ; Chavarrieta, Juan Manuel (coaut.) ; Morales, Sinue Isabel (coaut.) ; Figueroa, José Isaac (coaut.) ; Valle Mora, Javier Francisco (coaut.) ; Pineda, Samuel (coaut.) ;
Contenido en: Journal of Economic Entomology Vol. 111, no. 4 (August 2018), p. 1991-1995 ISSN: 0022-0493
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Resumen en: Inglés |
Resumen en inglés

Tamarixia radiata (Waterson) (Hymenoptera: Eulophidae) is an idiobiont ectoparasitoid of the Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae). This study evaluated natural parasitism of the different nymphal instars of D. citri by T. radiata on three different dates in 2015 at four sites with Mexican lemon (Citrus aurantifolia Swingle) groves and at one site with orange jasmine (Murraya paniculata [L.] Jacq.) plants in the Apatzingán Valley, Michoacán state. Different patterns of parasitism by T. radiata were observed among the different nymphal instars of D. citri, sites, and collection dates. No parasitism of first and second instars was observed, and it only reached up to 5.0% in third instars. In fourth and fifth instars, parasitism was highly variable (2–69 and 1–38%, respectively). In terms of the accumulated parasitism across host instars, the highest percentages were observed in the collections conducted in May in Crucero de Parácuaro (86%) and Antúnez (91%), and they were approximately 45% in the collections conducted on 23 March in Antúnez and on 10 April in Nueva Italia-2. In the remaining collections, parasitism was between 2 and 15%. Our results suggest that T. radiata is an important mortality factor for populations of D. citri; this could have potentially important implications for the biological control of D. citri and for the management of huanglongbing, a disease transmitted by D. citri, in citrus groves.