Vol. 12, Issue 4 (2023)

Author(s):
Pankaj Batham, Gaje Singh, Pankaj Kumar, Vinod Kumar and Mange Ram

Abstract:
The field experiments were carried out at the Crop Research Centre, Chirrodi of Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut (U.P.) during Kharif season of two consecutive years i.e. 2019 and 2020. To observed the incidence of early shoot borer, Chilo infuscatellus (Snellen) in relation to weather factors, the ten plants were randomly selected from each replication of untreated plots of the fields. The incidence of early shoot borer, C. infuscatellus was recorded on sugarcane variety Co 0238 from 17^th to 28^th standard week with mean incidence ranged from 3.38 to 21.70 percent per ten plants during Kharif, 2019. The early shoot borer incidence Kharif during 2019 was first reported at 17^th standard week (last week of April) with 3.38 percent per ten plants when mean maximum and temperature 34.36 °C and 28.84 °C, relative humidity at morning and evening 90.29 and 64.29 percent and rainfall were ranged from 0.00 to 0.00 mm, respectively. The pest activity increased from the third week of May and reached its peak at 23^rd standard week (first week of June) with 21.70 percent incidence per ten plants when mean maximum and minimum temperature 42.29 °C and 23.73 °C, relative humidity at morning and evening 33.81 and 64.29 percent and rainfall was ranged from 0.00 to 2.10 mm, respectively. The incidence decline (15.70% per ten plants) during 26 standard weeks (last week of June) when the maximum and minimum temperature was 41.29 °C and 26.36 °C. The relative humidity recorded at morning and evening was 60.69 and 84.00 percent and rainfall 0.00 mm. During Kharif, 2020, the incidence of early shoot borer was observed from 17^th to 28^th standard week with mean incidence ranged from 4.73 to 23.93 percent per ten plants. The C. infuscatellus incidence during Kharif 2020 was first observed at 17^th standard week (3^rd week of April) with 4.73 percent per ten plants when mean maximum and temperature 36.34 °C and 17.93 °C, relative humidity at morning and evening 27.10 and 46.60 percent and rainfall were ranged from 6.10 to 30.30 mm, respectively. The pest activity increased from the second week of May and reached its peak at 23^rd standard week (last week of May) with 21.40 percent incidence per ten plants when maximum and minimum temperature 38.54 °C and 21.40 °C, relative humidity at morning and evening 41.70 and 70.90 percent, respectively. Whereas, rainfall 42.10 mm was recorded. The incidence decline (13.39% per ten plants) during 27^th standard weeks (fourth week of June) when the maximum and minimum temperature was 36.09 °C and 27.29 °C. The relative humidity recorded at morning and evening was 31.69 and 60.30 percent and rainfall 7.20 mm.