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Memorias de investigación
Artículos en revistas:
The development of an economic threshold for Nasonovia ribisnigri (Hemiptera: Aphididae) on lettuce in Central Spain.
Año:2013
Áreas de investigación
  • Producción vegetal
Datos
Descripción
This study reports economic thresholds for the lettuce aphid Nasonovia ribisnigri (Mosley), based exclusively on cosmetic damage, that is, presence or absence of aphids at harvest time. Field trials were conducted in La Poveda Experimental Farm, Madrid (Spain) during autumn (2004 and 2005) and spring (2005 and 2006). Plants were arranged in plots and just before the formation of lettuce hearts they were infested with different densities of N. ribisnigri. Two days later, half of each plot was treated with tau-fluvalinate (Klartan24AF) and the other half remained as an untreated control. Economic thresholds were obtained from nonlinear regressions calculated between the percentage of commercial plants at the end of the crop cycle for both, treated and untreated semiplots, and the different initial densities of N. ribisnigri per plant. Two criteria were used to consider a commercial lettuce plant: a conservative estimate (0 aphids/plant) and a lax one (< 5 aphids/plant). Thus, an economic threshold was established for each season and criterium. The economic thresholds that were obtained with the most and least conservative criteria were in spring 0.06 and 0.12 aphids per plant, and in autumn 0.07 and 0.13 aphids per plant, respectively. These results show that to avoid cosmetic damage, insecticide sprays are required when a very low aphid density is detected in lettuce seedlings soon after transplant.
Internacional
Si
JCR del ISI
Si
Título de la revista
Journal of Economic Entomology
ISSN
0022-0493
Factor de impacto JCR
1,6
Información de impacto
Volumen
106
DOI
Número de revista
2
Desde la página
891
Hasta la página
898
Mes
SIN MES
Ranking
26/87 Entomology
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Ignacio Morales Marcos (UPM)
  • Autor: BM Diaz
  • Autor: A. Hermoso de Mendoza
  • Autor: M Nebreda
  • Autor: A Fereres
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