PRATEEK KUMAR, DALVINDER PAL SINGH, PARVEEN KUMAR, KOMAL AND RAHUL PUNIA
Department of Plant Pathology, Department of Genetics & Plant Breeding (Forage Section), Department of Agriculture Meteorology
CCS Haryana Agricultural University, Hisar-125 004 (Haryana), India
*(e-mail: prateekberwalhau@gmail.com)
(Received: 14 May 2026; Accepted: 24 June 2026)
SUMMARY
A field study was conducted during Kharif 2021 at CCS Haryana Agricultural University, Hisar, to investigate disease progression of bacterial blight of cluster bean caused by Xanthomonas axonopodis pv. cyamopsidis and its relationship with weather parameters. The crop was sown on July 23, 2021 and disease severity was recorded at weekly intervals. Disease progression followed a sigmoid pattern, increasing from 2% at 7 DAS to 87% at 84 DAS. The area under disease progress curve (AUDPC) was 3575, indicating severe disease development. Correlation analysis revealed positive association with rainfall (r = 0.78) and relative humidity (r = 0.72), while maximum temperature showed negative association (r = “0.55). Multiple regression analysis resulted in the model: Y = “31.87 + 0.41RH + 0.19RF “ 0.63Tmax (R2 = 0.91, p < 0.01) indicating strong predictive ability. The results suggest that moisture-related parameters play a dominant role in disease development and can be utilized for forecasting under semi-arid conditions.
Key words: Xanthomonas axonopodis pv. cyamopsidis, bacterial blight, cluster bean, bacterial blight, epidemiology, AUDPC, weather parameters, regression