Eur. J. Entomol. 115: 25-29, 2018 | DOI: 10.14411/eje.2018.004

Host-plant leaf-surface preferences of young caterpillars of three species of Pieris (Lepidoptera: Pieridae) and its effect on parasitism by the gregarious parasitoid Cotesia glomerata (Hymenoptera: Braconidae)

Tomoko WATANABE, Keiji NAKAMURA*, Jun TAGAWA
Department of Biosphere-Geosphere System Science, Faculty of Informatics, Okayama University of Science, Ridai-cho 1-1, Okayama 700-0005, Japan; e-mails: carassius_auratus_fumo@yahoo.co.jp, nakamura@big.ous.ac.jp, cotesiagl@gmail.com

Preferences of young caterpillars of three species of Pieris (P. rapae crucivora Boisduval, P. melete Ménétriès, and P. napi japonica Shirôzu) (Lepidoptera: Pieridae) for the upper and lower surfaces of the leaves of their host plants (Brassicaceae) were investigated in the laboratory. On horseradish Armoracia rusticana Gaertn. Mey. et Scherb., which was provided as a common food for three species, second and third instar larvae of the respective species preferred the lower to the upper surface of horizontally placed leaves, irrespective of whether they hatched on the upper or lower surface. First instar larvae seemed to remain on the surface on which they hatched. However, first instar larvae of P. melete on Rorippa indica (L.), a natural food of P. melete in the field, and first instar larvae of P. napi japonica on Arabis flagellosa Miq., a natural food of P. napi japonica, preferred the lower to the upper surface, just as second and third instar larvae did. To elucidate the effects of leaf-surface preference, the percentage parasitism of P. rapae crucivora on Arm. rusticana and Ara. flagellosa by the parasitoid Cotesia glomerata (L.) (Hymenoptera: Braconidae) was investigated. On Arm. rusticana, the percentage parasitism of the larvae on the upper surface was higher than that of larvae on the lower surface. On Ara. flagellosa, however, percentages parasitism were nearly equal on both surfaces. Leaf-surface preference by the larvae of Pieris is discussed in terms of avoidance of parasitism by the parasitoid C. glomerata.

Keywords: Lepidoptera, Pieridae, Pieris melete, Pieris napi japonica, Pieris rapae crucivora, Hymenoptera, Braconidae, Cotesia glomerata, parasitism rates, herbivore, host, Brassica oleracea var. capitata, Armoracia rusticana, Rorippa indica, Arabis flagellosa, leaf-surface preference, larva

Received: May 31, 2017; Accepted: January 8, 2018; Revised: January 8, 2018; Published online: January 29, 2018Show citation

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WATANABE, T., NAKAMURA, K., & TAGAWA, J. (2018). Host-plant leaf-surface preferences of young caterpillars of three species of Pieris (Lepidoptera: Pieridae) and its effect on parasitism by the gregarious parasitoid Cotesia glomerata (Hymenoptera: Braconidae). Eur. J. Entomol.115(1), 2018.000. doi: 10.14411/eje.2018.004.
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