HAL Id: hal-02814676
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Submitted on 6 Jun 2020
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Comparative effectiveness of two release rates of the egg
parasitoid Trichogramma chilonis Ishii (Hymenoptera :
trichogrammatidae) to control the sugarcane borer in
Reunion
M. Marquier, C. Clain, Elisabeth Tabone, R. Goebel, - Roux E.
To cite this version:
M. Marquier, C. Clain, Elisabeth Tabone, R. Goebel, - Roux E.. Comparative effectiveness of two
release rates of the egg parasitoid Trichogramma chilonis Ishii (Hymenoptera : trichogrammatidae)
to control the sugarcane borer in Reunion. 23. International Congress of Entomology;ICE 2008, Jul
2008, Durban, South Africa. 1 p. �hal-02814676�
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Comparative effectiveness of two release rates of the egg parasitoid
Trichogramma chilonis
Ishii (Hymenoptera: Trichogrammatidae) to control a
sugarcane borer in Reunion.
Marlène Marquier
1, Clarisse Clain
1, Elisabeth Tabone
2, Régis Goebel
3, Estelle Roux
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Département de Mise au Point des Méthodes de Lutte, FDGDON-Réunion, 97460 Saint-Paul, Reunion, 2Unité de lutte biologique, INRA – Centre de Sophia Antipolis, 06560 Valbonne, France, 3Unité de Recherche Systèmes cultures annuelles, CIRAD, 34398 Montpellier, France
Introduction: Trichogramma chilonis Ishii (Hymenoptera: Trichogrammatidae) is an egg
parasitoid of Chilo sacchariphagus Bojer (Lepidoptera: Crambidae), a stem borer attacking sugarcane stalks during the growth period. This research aimed at improving the cost / benefit ratio of a release method established in 2002 and 2004 trials. We evaluated two strategies with either reduced a) release points or b) release rate.
Methods: T. chilonis was released at two rates in nine sugarcane plots in Reunion. Response
to release rate was measured by the percentage of stem attacked 2, 4 and 6 month after the first release. Releases were made with a density of 100 release points in six plots, three plots with a release rate of 16/ 7d and three with 10 /10d. Three more plots were tested with 50 release point at 16/7d release rate.
Results: All nine release sites had significantly lower level of damage, on average half that of
the control plots. The damage reduction was not significantly different in fields with 50 and 100 release points. Likewise the release rate did not affect damage reduction.
Conclusion: These results help define augmentative release parameters for successful and
cost effective use of T. chilonis as a biological control agent of sugarcane stem borer in field conditions. Combining both optimizations will bring a sustainable control strategy to Reunion sugarcane growers.
