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Do the mechanisms modulating host preference in holometabolous phytophagous insects depend on their host plant specialization? A quantitative literature analysis

Abstract:

In holometabolous phytophagous insects, adult females and larvae determine host plant selection through oviposition and feeding preferences. Pre-imaginal and/or imaginal experiences with plant chemical cues can modulate these preferences. Various studies found evidence, or not, of host preference modulation through previous experience but they appear to contradict each other. Most probably, modulation of host preference depends on the degree of specialization of the insects. Our literature analysis revealed that the positive influence of experience in the modulation of host plant preference occurred equally in polyphagous, oligophagous and monophagous species, but was significantly more influenced by the phylogeny of the insect and the developmental stage involved in plant cue experience. Identification of phylogenic and developmental stage factors of “host learning” abilities appeared to be key information for pbkp_redicting the response of species to habitat modifications rather than the insect’s degree of host plant specialization. The signification of this output on the fact that some insect species or populations shifted from the wild to cultivated habitats to become important pests is discussed.