Effects of larval host plants on over-wintering physiological dynamics and survival of the cotton bollworm, Helicoverpa armigera (Hu¨ bner) (Lepidoptera: Noctuidae)

Liu, Z and Gong, P and Heckel, D G and et al, . (2009) Effects of larval host plants on over-wintering physiological dynamics and survival of the cotton bollworm, Helicoverpa armigera (Hu¨ bner) (Lepidoptera: Noctuidae). Journal of Insect Physiology, 55. pp. 1-9.

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Laboratory colonies of cotton bollworm larvae, Helicoverpa armigera, were kept at 20 8C under a photoperiod of L:D = 10:14 and fed on three host plants (cotton, tobacco, kidney bean) and an artificial diet (control) to determine the dynamic effects of larval host quality on over-wintering physiology and mortality. Energy reserves (glycogen and lipid), super-cooling points (SCPs), low-molecular-weight sugars, temperature, and mortality were monitored from November 2002 to April 2003. Lipid content did not change much for each group during over-wintering, but differed according to larval host plants. Larval host plants obviously influence the amount of glycogen, as does time of year: glycogen was lowest in February and increased in early spring. During winter, the mean pupal SCPs increased the most in February, then decreased, and were also affected by larval host plant, i.e. over-wintering pupae reared on kidney bean had the highest SCPs. Levels of glycerol and inositol differed significantly among host plants and months, which peaked in February. Pupal mortality also varied according to larval host plants and time: pupae reached their highest mortality in March and showed host plant differences in January. Records show that February was the coldest month during the period we observed, which corresponded closely to changes in over-wintering characteristics.

Item Type: Article
Additional Information: The work was supported by National Basic Research Program of China (973 Program, No. 2006CB102006), the Chinese National Key Basic Research Development Program (No. G2000016210), the Chinese Academy of Sciences Program (No. KSCX2-SW-103, No. KSCX2-1-02), the National Nature Sciences Fund (No. 30070128), and CAS Innovation Program. The authors thank Zeng Liangbin for his assistance in the laboratory and Emily Wheeler for editorial assistance.
Uncontrolled Keywords: Helicoverpa armigera, Host plants, Reserve storage, Low-molecular-weight sugars and sugaralcohols, Over-wintering dynamics, Pupal mortality
Author Affiliation: State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing 100101, China
Subjects: Plant Protection
Divisions: Other Crops
Depositing User: Mr Siva Shankar
Date Deposited: 16 Apr 2012 05:05
Last Modified: 16 Apr 2012 05:05
Official URL: http://dx.doi.org/10.1016/j.jinsphys.2008.07.017
URI: http://eprints.icrisat.ac.in/id/eprint/4722

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