Characterization of Indian biotypes of the rice gall midge, Orseolia oryzae (Wood-Mason) (Diptera:Cecidomyiidae)

Fourteen differential rice cultivare under four major donor groups were evaluated at 11 field locations in seven Indian states during 13 years against the rice gall midge, Orseolia oryzae (Wood-Mason) (Diptera:Cecidomyiidae). Three basic variations, which qualify to be called biotypes 1,2 and 3 could be identified based on overall reaction patterns against Eswarakora and Siam 29 differential groups. Biotype I cannot damage entries involving either Eswarakora or Siam 29. Biotype 2 is capable of damaging the group of Eswarakora and its derivatives but not able to damage the group of Siam 29. Biotype 3 can damage the Siam 29 group while being incapable of doing so with Eswarakora group. Quatorze variètés de riz provenant de quatre groupes differents ont étè evaluées pendant 13ans dans onze locations contre le moucheron du riz, Orseolia oryza (Wood-Mason) (Diptera:Cecidomyiidae). Trois differents Biotypes I, II et III ont put être identifier en se bassant sur la possible reaction du moucheron contre le groupe Eswarakora et Siam 29. Le Biotype I n'a pas pu dommager les deux groupes, par contre le Biotype II est capable de s'attaquer au groupe Eswarakora et ses derivées sans en affecter le groupe Siam 29. Le Biotype III a une action contraire au Biotype II.