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Differential selection of host plants by two Pieris species: the role of oviposition stimulants and deterrents
Author(s) -
Huang Xinpei,
Renwick J. A. A.
Publication year - 1993
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/j.1570-7458.1993.tb01689.x
Subject(s) - pieris rapae , biology , pieridae , host (biology) , botany , lepidoptera genitalia , ecology
Oviposition responses of Pieris rapae L. and P. napi oleracea Harris to nine crucifers, one Capparidaceae and one Tropaeolaceae were directly compared under controlled conditions. Chemical fractions from these plants were also tested on both insects for the presence of oviposition stimulants or deterrents. The results showed that plant chemistry is a key factor in differential selection of potential hosts by these Pieris species. Some plant species were equally acceptable to both Pieris species. However, P. rapae preferred cabbage over most test plants whereas P. napi oleracea strongly preferred plant species that were avoided by P. rapae. The observed preferences were explained in most cases by the presence of stimulants and deterrents in extracts of the plants. The two Pieris species have apparently evolved differential sensitivities to the chemical stimuli that trigger or deter oviposition. The balance of positively and negatively interpreted sensory signals evoked by plant chemicals obviously plays an important role in acceptance or rejection of a plant by both species. The role of specific glucosinolates and differing structure‐activity relationships is suggested.