Acta Entomologica Sinica (2004) 47, 705-714

Guo-Hua Zhong, Jin-Xiang Liu, Shan Guan, Jian-Jun Xie and Mei-Ying Hu (2004)
[Effects of rhodojaponins from Rhododendron molle on cuticle components of Spodoptera litura larvae and their structure-activity relationship]
Acta Entomologica Sinica 47 (6), 705-714
Abstract: The effects of fourteen active compounds previously isolated from Rhododendron molle G. Don on the cuticle components of Spodoptera litura larvae and their structure-activity relationship were studied to illustrate the mode of action and optimize rhodojaponins structure. The structures of three new compounds, rhodomolin A, B and C, were elucidated based on IR, UV, NMR and MS spectroscopic data. When the fourth instar larvae of S . litura were treated with 50 mg/L of compounds rhodojaponin III, rhodomolin A, rhodomollein I, , rhodomolin B, rhodomolin C, rhodomollein XVIII, grayantoxin III and azadirachtin, an known botanical insect growth regulator, respectively, the weight of larvae and pupae and the emergence rate were significantly less than CK, which showed greater insect growth inhibition activities than other tested compounds from R. molle. After 120 h treatment, all the cuticle chitin contents of larvae, both treated with compounds and CK, were 28.15% - 35.18%, which show no significant difference. When treated with compounds rhodojaponin III , rhodomolin A, rhodomolin B, rhodomolin C, rhodomollein XVIII and azadirachtin, however, the contents of total protein of larvae cuticle significantly increased and those of total fats decreased than those of CK, respectively.
(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): Guo-Hua Zhong, Mei-Ying Hu

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spodoptera litura