Orseolia oryzae

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Orseolia oryzae (click on image to enlarge it)
Authors: IRRI Photos
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Orseolia oryzae (Wood-Mason) - (Asian rice gall midge)

The gall midge is a serious pest of rice in tropical parts of Asia. The larvae feed on the tissue around the growing point, producing silvery and tubular galls, with a 'silver-shoot' or ‘onion shoot’ appearance. The affected plants are stunted and the formation of panicles is suppressed. Losses of up to 50% have been reported. Resistant rice cultivars have been developed against the gall midge, but resistance breaking biotypes have been a problem. Since the larvae live inside galls, chemical control is difficult.

The life cycle from egg to adult last approximately 3-4 weeks. Between seasons, the midge survives on alternate hosts like grass weeds. The adult has an orange, reddish or brown-red body, about 4 mm long. The male is slightly smaller.

Vernacular names
• Deutsch: Reisgallmücke
• English: rice gall midge
Asian rice gall midge
• Français: cécidomyie de la tige du riz

Pachydiplosis oryzae