Liu, Z and Gong, P and Wu, K and et al, . (2007) Effects of larval host plants on over-wintering preparedness and survival of the cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae). Journal of Insect Physiology, 53 (10). pp. 1016-1026.
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Abstract
Laboratory colonies of cotton bollworm larvae, Helicoverpa armigera, kept at 20 °C under a photoperiod of L:D=10:14 were fed on five host plants (cotton, corn, kidney bean, tobacco and tomato) and an artificial diet (control) to determine the effects of larval host quality on survival and pupal over-wintering preparedness. A separate experiment showed that diapausing pupae weighed more and contained greater nutrient stores than did non-diapausing pupae. Diapausing pupae reared on different host plants showed significant differences in terms of over-wintering reserve storage, and degree of cold-hardiness (extent of low-molecular-weight substances and SCPs), and survivorship. The more nutrients the host plant had, the more the pupae weighed and the higher the levels of total lipids and glycogen. Body water content was also significantly affected by larval food quality. The mean pupal super-cooling capacities varied significantly from −16.7 to −18.9 °C according to host plants the larvae feed on, and these significantly related to water content, pupal weight, lipid and glycogen content, and the levels of glycerol. Levels of trehalose, glycerol, and inositol, which were mainly low-molecular-weight substances, showed no significant differences among different host plants, except for trehalose. Pupal mortality varied from 39.7% on corn to 3.3% on the artificial diet, which was significantly related to pupal weight, total lipid content, trehalose levels, and super-cooling points. These results suggest that larval food quality can affect survival and influence the over-wintering preparedness of the cotton bollworm.
| 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), 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 Mr. Zeng Liangbin for his assistance in the laboratory and Emily Wheeler for editorial assistance. |
| Uncontrolled Keywords: | Helicoverpa armigera; Host plants; Reserve storage; Low molecular sugars and sugar-alcohols; Over-wintering preparedness; Survival |
| Author Affiliation: | State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 5 Datun Road Yi, Chaoyang District, Beijing 100101, China |
| Subjects: | Plant Protection |
| Divisions: | Other Crops |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 16 Apr 2012 05:00 |
| Last Modified: | 16 Apr 2012 05:00 |
| Official URL: | http://dx.doi.org/10.1016/j.jinsphys.2007.05.005 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/4721 |
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