Section 3
Chapter 2,489

Seasonal occurrence of the rice gall midge, Orseolia oryzae (Wood-Mason) , in a wild rice field in Thailand and parasitism by its parasitoids, Platygaster oryzae (Cameron) and P. foersteri (Gahan) (Hymenoptera, Platygasteridae)

Kadkao, S.

Japanese Journal of Entomology 59(2): 449-465


Accession: 002488028

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In investigations in rice fields in Thailand in 1975-76, 7 generations of Orseolia oryzae occurred per year. A mean of 500 1st-instar larvae per 50 hills occurred in the dry season, from early December to late February. The population declined from early March to April, with about 70% mortality during this period. Platygaster oryzae and P. foersteri passed through the dry season as eggs in the body cavity of 1st-instar larvae of O. oryzae.

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