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Head smut caused by Tolyposporium penicillariae Bref. is a devastating fungal disease that cause\udup to 30% yield losses in pearl Millet (Pennisetum glaucum (L.) R.Br.). An experiment was carried\udout in two sites (Koibatek and Marigat) in Kenya to estimate the losses in grain yield due to head\udsmut at varying levels of susceptibility in 50 promising advanced pearl millet genotypes. The test\udgermplasm were planted in a complete randomized block design (RCBD) in three replicates during\udthe short rains (Sept -Dec 2011) and long rains (April-July 2012). To assess the yield loss, two\udexperiments were set as sprayed with fungicide to control disease and unsprayed. Results showed\udthat among the tested genotypes, KAT PM1 and ICMV 221 were resistant checks and showed\udminimum yield loss as compared to the susceptible genotypes, (SDMV 94001 and SDMV 94014)\udwhich had highest yield loss. The mean grain yield loss varied between 6.5 and 60.8% in different\udgenotypes. Both incidence and severity of the disease were significantly and positively correlated\udwith losses in grain yield but severity contributed more. The prediction models for estimating yield\udlosses were derived from yield in protected plots compared to none protected plots. Results showed\udthat yield and disease severity were highly significant among the genotypes tested (Fpr <0.001) with\udyield ranging from 1172-4122 kg ha-1. Overall mean yield for both the seasons in the two sites was\ud2650 kgs ha-1 for the sprayed experiment and 2390 kgs ha-1 in the diseased plots. The overall yield\udloss due to head smut was 18%. High yielding genotypes were SDMV 90031, IP 8783, SHIBE,\udICMV 96603, ICMV221-1, IP6791 and ICMV 221 Bristled. These were recommended for further\udevaluation in multi-sites and be released as commercial varieties

Yield Losses and Path Coefficient Analysis of Head Smut Disease (Tolyposporium penicillariae) in Pearl Millet Genotypes