Population dynamics of early shoot borer, Chilo infuscatellus Snellen on sugarcane as influenced by weather conditions

Abstract

A field experiment on population dynamics of early shoot borer, Chilo infuscatellus Snellen on sugarcane was carried out during 2016-17 crop season at the research farm of CCS Haryana Agricultural University, Regional Research Station, Karnal. Studies on population dynamics revealed thathighest incidence (3.81 per cent in CoH 160, 4.60 per cent in CoH 119 and 3.12 per cent in CoS 767) of C. infuscatellus was recorded during 24th SMW. Correlation of C. infuscatellus population with various environmental factors revealed that there was a significant positive correlation with maximum temperature (Tmax.) and had a non-significant and positive correlation with minimum temperature (Tmin.) and sun shine hours (SSH) (r= 0.513, 0.287 and 0.452) on CoH 160, (r= 0.504, 0.321 and 0.431) on CoH 119 and(r= 0.537, 0.276 and 0.445) on CoS 767, respectively whereas it has non-significant and negative correlation with relative humidity (morning), relative humidity (evening) andrainfall (r= -0.172, -0.206 and -0.147) on CoH 160, (r= -0.147, -0.172 and -0.130) on CoH 119 and(r= -0.187, -0.223 and -0.160) on CoS 767. Multiple regression analysis of C. infuscatellus population with weather parameters showed that there was 77 per cent (CoH 160), 75 per cent (CoH 119) and 76 per cent (CoS767) variability in dead heart formation due to various environmental factors. The population dynamics revealed by this study have far reaching significance in pest management strategy as integrated control measures may be focused only during the period wherein population exceeds economic threshold level (ETL).

Chilo Infuscatellus Snellen's (Lepidoptera: Pyralidae) Biology and Its Management

“…The data clearly show that the oviposition period took significantly longer than the pre-and post-oviposition periods. These findings are consistent with the finding of Kumar et al (2019), and Kalariya and Radadia (2014), who reported that pre, post and oviposition period varied from 0-1, 1-2 and 2-4 days, respectively, and the oviposition period was also longer than pre-and post-oviposition periods in their studies, fully supporting the current findings. The total life cycle, longevity, and sex ratio of a male and female were also recorded in this study.…”

“…These findings are consistent with those of Kalariya et al (2014) who conducted the same experiment on C. infuscatellus in the laboratory and reported that the incubation period, larval and pupal duration were all recorded as short as possible, lending full support to the finding of the present study. Kumar et al (2019) conducted a study that is similar to this one but produced entirely different findings. They raised C. infuscatellus in a lab setting and found that the incubation time, larval timespan, and pupal period all took the maximum length of time.…”

“…The experiment was conducted in a controlled environment (32°F, 65°R, and CR Design) using the identical methodologies as Kumar et al (2019), with just a few minor adjustments. To investigate the life cycle of C. infuscatellus, we utilized the procedure of collecting egg clusters from the greenhouse by following the method that had been described earlier.…”

Effect of Morphological Characters of Indigenous Sugarcane Varieties on Population of Chilo infuscatellus (Snellen) and its parasitoid, Cotesia flavipes (Cameron)

“…Therefore, it is evident from previous study of Abdullah et al (2006) that morphological characteristics of different sugarcane varieties showed association with the stem borer infestation. As such, a significant but negative correlation between stem borer infestation and total shoot length has been reported by Kumar et al (2018). Studies also reported that sheath length at bottom, mid and top cane portion also had association with the stem borer infestation and losses were decreased in canes with stronger bottom and mid portion sheath (Abdullah et al, 2005).…”

Life Cycle of Chilo zacconius Blensynski (Lepidoptera: Crambidae) on Artificial Diet in The Laboratory

“…The life cycle duration of C. zacconius ranged between 40-65 days from our study which mirrors that of C. partellus and C. infuscatellus whose life cycles span between 34-66 days and 29-44 days respectively (Panchal and Kachole, 2013;Arunkumara et al, 2018;Peddakasim, et a.,. 2018;Kumar et al, 2019). The use of artificial diets for larval rearing have been reported to be successful and could also pose various challenges to many Lepidopteran larvae (Ngomane et al, 2022;Wei et al, 2023 ).…”