DETECTION OFASIAN RICE GALL MIDGE (Orseolia oryzae (WOOD-MASON) ) BIOTYPE AT ARS, NELLORE, ANDHRA PRADESH.

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P. N. HARATHI,1 P. RAJA SEKHAR2, K. V. HARI PRASAD1, B. V. BHASKAR REDDY2 AND
B. RAVINDRA REDDY1
Dept. of Entomology, S.V. Agricultural College, ANGRAU, Tirupati-517 502, Chittoor Dt., Andhra Pradesh, 1 Regional Agricultural Research Station2, ANGRAU, Tirupati

ABSTRACT

Identification of Asian rice gall midge, Orseolia oryzae (Wood-Mason) biotype was carried out during 2016- 18 under field conditions. A set of 17 standard rice differentials representing five groups identified to characterize the prevailing rice gall midge biotypes in the country were evaluated against gall midge population at ARS, Nellore. Based on the reaction pattern of standard differentials to gall midge populations, the biotype at ARS, Nellore was not following any prescribed pattern of any of the seven identified biotypes. So, Per cent Similarity Index of the reaction pattern observed at ARS, Nellore was calculated and based on the results from the two years data, it was found that the biotype at ARS, Nellore was 70.8 per cent similar to biotype 4 and 4M.

KEY WORDS: Rice gall midge, biotypes, Cecidomyiidae, Orseolia oryzae, Oryza sativa.