Acta Entomologica Sinica (2008) 51, 628-634

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Yuan-Xi Li, Hua-Guo Dai and Wen-Jun Fu (2008)
[Suitability of Corcyra cephalonica to three Trichogramma species and change of the content of free amino acids in its eggs parasitized]
Acta Entomologica Sinica 51 (6), 628-634
Abstract: The suitability of host to parasitoid could be investigated by observing the parasitizing behavior and the development of parasitoid, and the development of parasitoid was based on the ability of parasitoid in using host nutrients. In order to find the relationship between the suitability of host to Trichogramma wasps and the ability of Trichogramma wasps in using host nutrient, we investigated the parasitizing behavior, development and survival of Trichogramma confusum, T. dendrolimi, and T. ostriniae on Corcyra cephalonica, and measured the content of free amino acids in parasitized and unparasitized host eggs in the laboratory. The results indicated that the oviposization time of T. ostriniae was 84.9 s, which was significantly longer than that of T. dendrolimi and T. confusum. The host-checking time of T. confusum was 30.8 s, which was significantly longer than that of T. dendrolimi and T. ostriniae, but the number of T. confusum. emerged from per host was significantly more than that of T. dendrolimi and T. ostriniae. There were no significant differences in developmental duration of egg + larvae, but significant differences were found in developmental duration from egg to adult among three Trichogramma species. Both the larva and prepupa mortality rates of T. ostriniae were significantly higher than those of the correspondent developmental stage of T. confusum and T. dendrolimi. These results indicated that the suitability of C. cephalonica to T. confusum and T. dendrolimi were higher than that to T. ostriniae. The content of total free amino acids in unparasitized C. cephalonica eggs decreased from 2.194 mg/mL at 24 h to 1.565 mg/mL at 96 h, whereas it increased at first and then decreased in eggs parasitized. The content of total free amino acids in eggs parasitized by T. confusum and T. dendrolimi reached the highest values, which were 3.222 mg/mL and 4.239 mg/mL, respectively, at 48 h, and the content of total free amino acids in eggs parasitized by T. ostriniae reached the highest value, which was 4.323 mg/ml at 72 h after parasitization, indicating that T. confusum and T. dendrolimi could degrade and use host nutrients more quickly than T. ostriniae. These results suggested that the differences in ability of Trichogramma in using the host nutrients caused the differences in suitability of C. cephalonica to three Trichogramma species.
(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): Yuan-Xi Li, Wen-Jun Fu

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution


Pest and/or beneficial records:

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


Corcyra cephalonica
Trichogramma chilonis (parasitoid) Corcyra cephalonica
Trichogramma ostriniae (parasitoid)
Trichogramma dendrolimi (parasitoid) Corcyra cephalonica