Seasonal Incidence of Stem Borer (Chilo partellus L.) on Maize (Zea mays)

The Field experiment was carried out at the Entomological experimental field, Diksha Bhawan, Institute of Agriculture and Natural Science, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur (Uttar Pradesh) during the Kharif season 2023 to study on “Seasonal incidence of stem borer (Chilo Partellus L.) on Maize (Zea mays). The pest activity was initially observed in the 32nd SMW and continued till the crop harvesting stage 43rd SMW. The recorded percentage of dead heart ranged from 0.33 to 3.27 per cent during the year, 2023. The percentage of dead heart formation was low from the first week of August to the end of August and varied from 0.33 to 1.67 per cent. The dead heart formation increased from the first week of September and reached its peak i.e. 3.27 per cent during the 39th standard week. It is evident from the correlation of per cent dead heart of stem borer, C. partellus was found positive with maximum (r= 0.371) and minimum (r= 0.34) temperature during, 2023. The correlation between dead heart with morning and evening relative humidity was found positive r= 0.07 and 0.221, respectively. While rainfall negative correlation r= -0.359 dead heart of C. partellus, respectively during the year 2023. The correlation coefficient between the larval population of C. partellus and weather parameters presented in the data revealed that the correlation of the larval population of C. partellus was found positive with maximum (r= 0.334) and minimum (r= 0.362) temperature during the year, 2023. The correlation between larval population with morning and evening relative humidity was found negative r= -0.092 and r= -0.304, respectively. While rainfall had negative correlation (r= -0.313) larval population.