Annals of the Entomological Society of America (2009) 102, 76-84

Azusa Yamasaki, Ken Shimizu and Kenji Eujisaki (2009)
Effect of host plant part on larval body-color polymorphism in Helicoverpa armigera (Lepidoptera: Noctuidae)
Annals of the Entomological Society of America 102 (1), 76-84
Abstract: Larvae of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), exhibit a body-color polymorphism that is most distinct in the final instar. Larval coloration was investigated in relation to the effects of host plant diet. Larval coloration was strongly influenced by the plant parts on which larvae fed; larvae that fed on leaves exhibited a higher frequency of green coloration than larvae that fed on flowers and fruit. This pattern also was exhibited in full sibling larvae that had uniform genetic background. Larval performance in terms of survival, developmental period, and pupal weight was better in larvae reared on fruit than in those reared on leaves. Our results suggest that larval coloration was determined primarily by the portion of the plant upon which larvae were reared. Larvae also had a certain degree of plastic response to the diet change, which indicates larvae can adjust body color as they change the part of the host plant where they feed. Although the adaptive consequence of similar body color to plant part is still unknown, diet-induced body-color polymorphism in H. armigera might have some role in helping larvae avoid visual predation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Ken Shimizu

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa armigera	Maize/corn (Zea mays)	Japan