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Intraspecific variation of host plant and locality influence the Lepidopteran- parasitoid system of Brassica oleracea crops

AutorSantolamazza Carbone, Serena ; Velasco Pazos, Pablo ; Selfa, Jesús; Soengas Fernández, María del Pilar ; Cartea González, María Elena
Palabras claveKale
Biological control
Parasitoid community
Insect-plant interaction
Fecha de publicaciónjun-2013
EditorEntomological Society of America
CitaciónJournal of Economic Entomology 106 (3): 1134-1144 (2013)
ResumenThe aim of the study was to investigate the attractiveness to herbivores and parasitoids of two cultivars of Brassica oleracea, namely B.oleracea var. acephala (kale) and B. oleracea var. capitata (cabbage), which exhibit differences of morphological and biochemical traits. To this end, field samplings were replicated at seven localities during one season in Galicia (NW Spain). Three specialist and three generalist lepidopteran species were sampled. A total of 7,050 parasitoids were obtained, belonging to eighteen genera and twenty-two species. The results showed that: 1) parasitism rate and parasitoid species richness changed with locality and was higher in cabbages, although this crop had lower herbivore abundance than kales, 2) the proportion of specialist herbivores was higher in cabbages, whereas generalists dominated in kale crops, 3) the abundance of the egg parasitoid Telenomus sp., and the larval parasitoids Cotesia glomerata and Diadegma fenestrale was higher in kale crops, 4) parasitism rate of P. rapae larvae and pupae and M. brassicae eggs were higher in kales. In contrast with the notion that plant structural complexity provides physical refuge to the hosts and can interfere with parasitoid foraging, parasitism rate was higher on cabbage plants, which form heads of overlapped leaves. Possibly different chemical profiles of cultivars also influenced host-parasitoid relationship. These results suggest that top-down and bottom-up forces may enhance cabbage crops to better control herbivore pressure during the studied season. In Spain, information on natural occurring parasitoid guilds of kale and cabbage crops is still scarce. The data provided here about parasitoid species diversity, richness and parasitism rate, contribute to fill this gap and also represent a critical first step for conservation biological control plans of Brassica crops.
Descripción'This article is the copyright property of the Entomological Society of America and may not be used for any commercial or other private purpose without specific written permission of the Entomological Society of America
Versión del editorhttp://dx.doi.org/10.1603/EC12481
Identificadoresdoi: 10.1603/EC12481
issn: 0022-0493
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