Survey on powdery mildew of coriander in northern parts of Karnataka

K. GOUTHAM; ARUN R. SATARADDI; S. M. VASTRAD; B. T. NADAGOUDA

doi:10.61475/JFS.2025.v38i4.29

K. GOUTHAM Department of Plant Pathology, University of Agricultural Sciences, Dharwad - 580 005, India
ARUN R. SATARADDI Department of Plant Pathology, University of Agricultural Sciences, Dharwad - 580 005, India
S. M. VASTRAD Department of Plant Pathology, University of Agricultural Sciences, Dharwad - 580 005, India
B. T. NADAGOUDA Department of Agronomy, College of Agriculture, Dharwad University of Agricultural Sciences, Dharwad - 580 005, India

DOI: https://doi.org/10.61475/JFS.2025.v38i4.29

Keywords: Coriander, Erysiphe polygoni, Powdery mildew, Severity, Survey

Abstract

A roving survey was carried out during rabi 2024 in four major coriander growing districts of Northern Karnatakanamely Belagavi, Bagalkot, Dharwad and Vijayapura to assess the prevalence and severity of powdery mildew caused by Erysiphe polygoni DC. The survey covered 36 villages across 12 talukas and observations were recorded on crop stage, soiltype, irrigation method and Percent Disease Index (PDI). Belagavi recorded the highest mean PDI (38.43%) with maximumseverity of (53.59%) at Badigwad (Gokak taluk), followed by Bagalkot with an average of (32.98%) and a peak of (44.26%)at Gulgal Jambagi (Mudhol taluk). Dharwad showed moderate incidence with a mean PDI of (20.17%) whereas Vijayapurarecorded the lowest incidence averaging (16.78%). Wilt and blight were also observed in some villages particularly in heavysoils with poor drainage. Higher severity in Belagavi and Bagalkot was linked to late sowing which exposed crops to warmand dry conditions favorable for the pathogen. The presence of alternate hosts such as fenugreek, green gram and black gramalong with dense canopy and poor aeration further aggravated disease spread. The findings emphasize the role of sowingtime, crop history and microclimate in shaping powdery mildew epidemics in coriander.