spect to specific host plant resistance genes (Gallun et al., 1961). Asian rice gall midge (Orseolia oryzae Wood-Mason) is the mostNine nonallelic resistant genes were identified in indestructive pest of rice (Oryza sativa L.) in several regions of South heritance studies of gall midge resistance using approxiand Southeast Asia. Resistance to gall midge is primarily governed mately 100 different rice lines as donors. The Gm1 (gall by single dominant genes in rice, thus newly evolving biotypes are able to overcome resistance genes rendering these genes ineffective.midge resistant) gene identified in 'Samridhi' and Gm2

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