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A new biotype of the Asian rice gall midge Orseolia oryzae (Diptera: Cecidomyiidae) characterized from the Warangal population in Andhra Pradesh, India

Published online by Cambridge University Press:  01 September 2006

P. Vijaya Lakshmi ,
S. Amudhan ,
K. Hima Bindu ,
C. Cheralu  and
J. S. Bentur
P. Vijaya Lakshmi
Affiliation:
Department of Entomology, Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030, AP, India
S. Amudhan
Affiliation:
Department of Entomology, Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030, AP, India
K. Hima Bindu
Affiliation:
Department of Entomology, Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030, AP, India
C. Cheralu
Affiliation:
Agricultural Research Station, ANGR Agricultural University, Warangal, 506 007, AP, India
J. S. Bentur*
Affiliation:
Department of Entomology, Directorate of Rice Research, Rajendranagar, Hyderabad, 500 030, AP, India
*
*E-mail: jbentur@yahoo.com
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Abstract

Six distinct biotypes of the Asian rice gall midge, Orseolia oryzae (Wood-Mason), have been characterized so far from different parts of India and their geographical distribution has been well mapped and monitored annually through the national gall midge biotype studies. These studies have been showing minor changes in the virulence pattern of the pest population at Warangal in Andhra Pradesh state since 2000. Hence, a sample of the pest population from the site was collected during 2003 and selected subsequently in a greenhouse through 13 successive generations for virulence against diverse sources of plant resistance. This Warangal-derived population (WDP) was tested to record reactions of two sets of differential rice varieties used for biotype detection and known to carry one of the 10 known gall midge-resistance genes. The results revealed that WDP has acquired virulence against CR-MR1523, one of the biotype differential rice varieties, which derived resistance from the source Ptb21 cultivar. Since the virulence pattern noted for WDP was different from that noted for the six characterized biotypes, it is proposed to designate this new biotype, tentatively, as biotype 4M. Only three of the resistance genes, viz. Gm3Gm4 and Gm8 confer resistance against this biotype.

Résumé

Six biotypes différents de la cécidomie asiatique du riz, Orseolia oryzae (Wood-Mason), ont été identifiés dans différentes régions d'Inde et leurs distributions géographiques cartographiées et suivies tout au long de l'année dans le cadre du programme national sur la cécidomie. Les études ont montré des variations mineures de la virulence des populations à Warangal dans l'état d'Andhra Pradesh depuis 2000. Aussi, un échantillon de cette population a été récolté en 2003 et maintenu pendant 13 générations successives sous serre afin de tester sa virulence sur différentes sources de résistance du riz. Cette souche de Warangal a été testée pour évaluer deux lignées de variétés de riz utilisées pour la détection de biotypes et connues pour porter l'un des 10 gènes de résistance à la cécidomie. Les résultats montrent que la souche de Warangal est devenue résistante à CR-MR 1523, l'une des variétés résistantes de riz, obtenue à partir de la sélection du cultivar Ptb 21. Dans la mesure où la mode de résistance de la souche de Warangal présente des caractéristiques différentes des six autres biotypes connus, nous proposons de nommer ce nouveau biotype, biotype 4M. Seuls trois des gènes de résistance du riz, Gm3Gm4 et GM8 confèrent la résistance à ce biotype.

Keywords

rizrésistancecécidomieOrseolia oryzaebiotyeOryzasativariceresistancegall midgeOrseolia oryzaebiotypeOryzasativa
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 26 , Issue 3 , September 2006 , pp. 207 - 211
Copyright
Copyright © ICIPE 2006

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