Survey and Disease Prevalence of Sorghum Zonate Leaf Spot in the Terai Region of Uttarakhand, India

Aims: The objective of the study was to conduct a disease survey to understand the regional dynamics of sorghum zonate leaf spot disease in the Uttarakhand Terai region.

Study Design: The investigation was carried out using a stratified random sampling technique.

Place and Duration of Study: GBPUA&T, Pantnagar and Terai Region of Uttarakhand during Kharif 2024.

Methodology: The survey was conducted from July to September 2024, covering several stages of sorghum crop development. A stratified random sampling technique was used to select fields, and observations were recorded on plants making five stops in a W-pattern to cover the whole field on foot. The disease incidence and severity were scored and recorded.

Results: The survey covered 25 fields and disease incidence & severity were recorded using a standard scale. The study found that the prevalence and severity of zonate leaf spot disease
(G. sorghi) varied significantly between locations, with the highest disease incidence in Chikaghat (71.11%) and lowest in Kanthgri (43.56%) from Sitarganj block. Environmental parameters such as temperature, humidity, and rainfall were directly linked to the occurrence and severity of zonate leaf spots.

Conclusion: The study concluded that zonate leaf spot disease is a significant problem in the Uttarakhand Terai Region. Developing efficient management techniques to reduce zonate leaf spot negative effects on crop productivity might be facilitated by knowledge of the distribution and contributing elements. To control zonate leaf spot in these areas, more study is required to investigate resistant cultivars and better agronomic methods.