Acta Entomologica Sinica (2005) 48, 749-753

Hai-Jun Xiao, Fang-Sen Xue, Yang-Qing Liu and Xing-Fen Zhu (2005)
[Comparison of photoperiodic response between rice- and water-oat-populations of Chilo suppressalis (Walker)]
Acta Entomologica Sinica 48 (5), 749-753
Abstract: Photoperiodic responses of diapause induction in the striped stem borers, Chilo suppressalis, collected from both rice field (rice-population) and water-oat field (water-oat-population) were investigated, with the two populations fed on rice and water-oat, respectively. The photoperiodic response curves showed that most of larvae entered diapause regardless of photoperiod length when the rice-population was fed on water-oat or the water-oat-population was fed on rice. This indicated that the two populations have evolved to adapt to their corresponding hosts. Only 5%-6% water-oat-population pupated when larvae fed on rice and larval duration was 15-18 days longer than that fed on water-oat; whereas 30%-40% rice-population fed on water-oat pupated and the larval duration was only 3-8 days shorter than that fed on rice. When the water-oat-population was fed on rice and water-oat, respectively, the weight of larvae (32 days old) fed on rice was equal to 53.1% of the larvae fed on water-oat; whereas when the rice-population was fed on rice and water-oat, respectively, the weight of larvae fed on rice was equal to 79.5% of the larvae fed on water-oat. These results indicated that water-oat-population had little adaptability to rice, whereas the rice-population had some adaptability to water-oat. This suggests that the intra species differentiation has appeared between the two populations and planting of water-oat should be no significant influence on the incidence of striped stem borers in rice field.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Fang Sen Xue

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.
	Chilo suppressalis	Rice (Oryza)