S.K. KHINCHI, K.C. KUMAWAT, S.R. YADAV AND HANSRAJ MEENA

The experiment on screening of different genotypes of blond psyllium, Plantago ovata Forsk. for resistance against

aphid, Rhopalosiphum maidis (Fitch) was conducted at S.K.N. College of Agriculture, Jobner. Out of nine genotypes of

blond psyllium (GI–2, HI–2, RI–9808, RI–3026, RI–3025, RI–89, RI–9709, Jalore Local and Barmer Local) screened

against aphid, R. maidis. Based on the statistical categorization (^X+ó) of mean pooled aphid population, the genotype RI–

9808 was found to be least susceptible (<34.59 aphids/ tiller) and RI–3025 and RI–3026 as highly susceptible (>45.67

aphids/ tiller). The rest of the genotypes were found as moderately susceptible. The order of different genotypes possessing

increasing population of aphid was found to be RI–9808, RI–89, Jalore local, Barmer local, RI–9709, GI–2, HI–2, RI–3025

and RI–3026. The bio–physical parameters of different blond psyllium genotypes, viz., mean plant height (cm), tillers per

plant, spike length (cm), days to 50 per cent flowering and number of spikes per plant revealed negative significant

correlation with aphid population (r=–0.86, –0.95, –0.77, –0.63 and –0.87, respectively). The days to maturity of different

blond psyllium genotypes did not reveal significant correlation with the mean aphid population on different genotypes.