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ThesisItem Open Access Etiology and management of foliar blight of barley(Punjab Agricultural University, Ludhiana, 2007) Girish Kumar; Sharma, Vineet K.The foliar blight of barley appeared to be a mixed infection of spot blotch and net blotch. However, majority of symptoms were of spot blotch. The isolated fungus was identified as Bipolaris sorokiniana. Eight single spore isolates of pathogen were obtained from infected leaves. All eight isolates sporulate on PDA medium. Pathogenic behaviour of selected isolates on four barley cultivars viz., PL426, PL419, PL172 and VJM201, wheat cultivars viz., HD2329 and PBW343 and Phalaris minor revealed that isolate I1 was more pathogenic on all barley cultivars but none of them produce disease on wheat cultivars and Phalaris minor. Early sowing increased the disease and it decreased significantly with each succeeding date of sowing. Increase in doses of fertilizers (N :P :K) increased the disease severity. The disease severity was found to be more in zero than conventional tillage. In the laboratory the results revealed that Tilt was most effective checked the fungal growth followed by Folicur/Raxil, Amistar and Vitavax. Score and Contaf were found to be least effective. Results of the field experiments were similar to those obtained in laboratory. In seed treatment, Vitavax + Thiram @ 3g each/kg seed controlled disease to maximum extent, followed by Vitavax + Thiram @ 1.5g each/kg seed, Amistar @ 2ml/kg seed. Raxil and bio-control agents were least effective. In foliar spray, Tilt was most effective, followed by Folicur and Amistar in controlling disease. Contaf and bio-control agents were least effective. In seed treatment & foliar spray, Vitavax + Thiram @ 3g each & Tilt @ 0.1% spray were most effective. Bio-control agents were least effective as seed treatment and foliar spray in controlling disease. Calcium chloride (0.3%) was most effective in inducing resistance.
