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Oviposition and infestation of the sorghum shootfly, Atherigona soccata Rondani, on certain sorghum cultivars in relation to their relative resistance and susceptibility

Published online by Cambridge University Press:  19 September 2011

G. C. Unnithan  and
K. V. Seshu Reddy
G. C. Unnithan
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, Mbita, South Nyanza, Kenya
K. V. Seshu Reddy
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), Mbita Point Field Station, P.O. Box 30, Mbita, South Nyanza, Kenya
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Abstract

Sorghum shootfly, Atherigona soccata, oviposition and infestation on eight resistant sorghum cultivars (IS nos: 2122,2123, 2205, 2291, 4660, 5092, 5480 and 18551) and two susceptible cultivars (Serena and CSH-1), were studied under field conditions (natural infestation). The eight resistant cultivars and CSH-1 were also tested for preference for oviposition in a two-choice situation in the screenhouse. The eight resistant cultivars received considerably less shootfly eggs and showed fewer “dead hearts” than the susceptible cultivars. The results indicate that non-preference for oviposition is an important mechanism for resistance to shootfly in eight test cultivars. There was also evidence for a certain degree of antibiosis in IS 2291.

Résumé

La mouche de sorgho, Atherigona soccata, oviposition et infestation sur huit cultivars de sorgho (IS nos: 2122, 2123, 2205, 2291, 4660, 5092, 5480 et 18551) ont montré une résistance a la mouche de sorgho et deux cultivars susceptibles (Serena et CSH 1) ont été étudiés dans les champs (infestation naturelle). Les huit cultivars résistants et CSH 1 ont été testés quant a la préférence de la mouche pour oviposition dans une situation à deux choix dans la maison de dépistage. Les huit cultivars résistant ont reçu considérablement moins d'oeufs et ont montré de coeurs morts (dead hearts) que des cultivars susceptibles. Les résultats ont montré que la non-préférence pour oviposition est un mécanisme important pour la résistance dans les huit cultivars expérimentaux. On a décelé aussi un certain degré d'antibiose dans IS 2291.

Keywords

AntibiosisAtherigona soccatanon-preferenceovipositionresistanceshootflysorghumsusceptibilityAntibioseAtherigona soccatanon préférenceovipositionrésistancemouche à sorghosusceptibilité
Type
Section V: screening techniques and methodologies for host plant resistance research
Information
International Journal of Tropical Insect Science , Volume 6 , Special Issue 3: Host Plant Resistance and its Significance in Pest Management , June 1985 , pp. 409 - 412
Copyright
Copyright © ICIPE 1985

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References

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