Abstract
Twenty four genotypes of barley were screened for their resistance against corn leaf aphid, Rhopalosiphum maidis (Fitch.) under field as well as screen house conditions during the year 1994-95. The corn leaf aphid, Rhopalosiphum maidis (Fitch) population started appearing on plants of some genotypes during standard week 3(mid January) attaining a peak during 7th standard week (mid February) when maximum population of 61.67 and minimum of 14.60 aphids per iiller was observed on genotypes clipper and AR-4, respectively under natural infestation conditions. All the twenty four genotypes were grouped as tolerant (AR-4, AR-66, AR-5, AR-48, AR-14, AR-11, AR-17, AR-16 and AR-52), susceptible(AR-10, AR-7, AR-3, AR-30, AR-13, AR-2, AR-15, AR-12, AR-9 and AR-8) and highly susceptible (BH-75, AR-25, AR-19, AR-18 and Clipper) based upon their reaction against aphid infestation under field conditions. Under screenhouse conditions the genotypes AR-4 and AR-7 exhibited tolerant reaction, while 15 genotypes (AR-48, AR-5, AR-10, AR-14, AR-52, AR-30, AR-66,AR-16, AR-2, AR-13, AR-9, AR-17, AR-3, AR-11 and AR-8) were found to be susceptible and remaining seven genotypes (AR-25, AR-12, AR-15, AR-19, AR-18, BH-75 and Clipper) as highly susceptible.
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