Reference : Impact of Harmonia axyridis (Coleoptera: Coccinellidae) on the survival rates of othe...
Scientific congresses and symposiums : Paper published in a journal
Life sciences : Entomology & pest control
http://hdl.handle.net/2268/114894
Impact of Harmonia axyridis (Coleoptera: Coccinellidae) on the survival rates of other aphidophagous species in semi-field conditions
English
Vandereycken, Axel mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Durieux, Delphine mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Joie, Emilie mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
Haubruge, Eric mailto [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech >]
Verheggen, François mailto [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
24-May-2011
Communications in Agricultural and Applied Biological Sciences
76
2
219-226
Yes (verified by ORBi)
International
1379-1176
Gent
Belgium
63 International Symposium on Crop Protection
24 May 2011
Gent University
Gent
Belgium
[en] The multicoloured Asian ladybird Harmonia axyridis Pallas (Coleoptera: Coccinellidae), previously introduced as a biological control agent against aphids, is now frequently considered as an intraguild predator, consuming other aphid natural enemies. Interactions between this exotic ladybird and other aphidophagous species present in Belgian agro-ecosystems such as Coccinella septempunctata, Episyrphus balteatus and Chrysoperla carnea are asymmetric to the benefit of H. axyridis.
This study focuses on the survival rate of three aphidophagous species Harmonia axyridis (Ha), Coccinella septempunctata (C7) and Episyrphus balteatus (Eb) placed in cages in biological fields of potato and sugar beet. During June and July, hermetic cages were disposed on the crops with 10 larvae (second stage) of each aphidophagous. Four types of cages were observed (1) Ha+Eb+C7+ aphids, (2) Ha+Eb+C7, (3) Eb+C7+ aphids and (4) Eb+C7. Each combination was repeated three times.
In sugar beet fields, E. balteatus was the species with the highest mortality rate. The two coccinellid species had a better survival rate than E. balteatus. All aphidophagous species had higher mortality rates in absence of aphids. In potato, when aphids were present in excess, the survival rates of all aphidophagous insects were lower than in sugar beet probably because A. fabae is less adapted to the potato morphology. Nevertheless, we have observed in potato no mortality of C. 7-punctata during all its development cycle. This suggests that (1) C. 7-punctata may use aphids as food sources more efficiently than H. axyridis and (2) that interactions between aphidophagous could be less frequent (difficulty of mobility). In potato and sugar beet, H. axyridis had the longest development cycle, being still at the larval stage when C. 7-punctata and E. balteatus reached the pupae stage. We can suppose that pupae of E. balteatus and C. 7-punctata were an alternative food (intraguild prey) to H. axyridis when aphids were lacking. Pupae are immobile and therefore more sensitive to the attack of predators.
Gembloux Agro-Bio Tech, Entomologie fonctionnelle et évolutive
Région wallonne : Institut scientifique de Service public - ISSeP
Evaluation de l'impact des invasions de coccinelles asiatiques sur l'agriculture wallonne et prise en considération dans les programmes de lutte intégrée
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/114894

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