Status of Karnal bunt of wheat in Rajasthan and its management.

摘要

Post-harvest surveys of grain mandies and farmers' fields were undertaken for the collection of Karnal bunt (Tilletia indica) infected wheat grain samples during the last 15 years (Rabi 1996-97 to 2010-11). Of the total 5489 wheat grain samples collected and analyzed, 823 samples (15%) were found infected with Karnal bunt. The disease incidence ranged from 1.7-33.9% during the last decade and was maximum in the year 2006-07 with infection range of 0.1-71.0%, being maximum in variety PBW 343 samples collected from Kotputli (Jaipur). For its management through chemical and bio-agent, a field experiment was conducted by inoculation with the pathogen. Two sprays of propiconazole 25EC (0.1%), first at ear-head emergence stage (growth stage Z49) and the second after 10 d, were found best resulting in almost complete control (99.5%) of the disease, followed by two sprays of Trichoderma viride @ 0.4% and propiconazole 25EC @ 0.1% at 10-d-intervals providing 86.9% disease control.