Study on different components of resistance in wheat genotypes to green bug (Schizaphis graminum) (Rondani)

The green bug (schizaphis graminum) (homoptera: aphididae) is a major aphid species attacking wheat crop in pakistan,and is reported as a major wheat pest across the world. host plant resistance is a strong pillar in integrated pest management (ipm) for reducing the impact of this pest. several green bug resistant genes have been identified and introduced in commercial high yielding cultivars of wheat to manage green bug. three different experiments were conducted on ten cultivars (mptv13,mpt-v3,mpt-v6,pr-104,mpt-v17,mpt-v26,mpt-v5,mpt-v33,mpt-v28 and pr- 102) to determine categories of resistance. during first experiment 'antixenosis' none of the genotype proved resistant while in second experiment 'tolerance' the genotype 'mpt-v33' had shown good and significant vigor compared to all the tested genotypes. the third experiment antibiosis resistance was identified in genotype 'mpt-v5',where green bug took significantly longer time (8.5 days) to produce 31.3 nymphs compared to the tested genotypes and susceptible check. copyright 2016 zoological society of pakistan.