Infestation levels of sugarcane shoot borer Chilo infuscatellus in Cauvery delta zone of Tamil Nadu, India
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Keywords:
Sugarcane, Shoot borer, Chilo infuscatellus, Cauvery delta zone, Pudukottai, ThanjavurAbstract
Status of sugarcane shoot borer Chilo infuscatellus Snellen (Lepidoptera: Pyralidae) in the sugarcane command area of Pudukottai and Thanjavur districts lying in the Cauvery delta zone of Tamil Nadu, India, was assessed in May and October during 2013-2015. Infestation levels of the borer varied among eight divisions of the command area, two seasons and three years. In May, mean infestation rate was the highest in Vallathirakottai division (44.32%) and lowest in Andakulam division (37.86%). In October, the highest mean infestation rate was observed in Avanam (37.99%) and the lowest in Andakulam (25.49%). Repeated measures ANOVA analysis indicated that mean shoot borer infestation rate was significantly higher (40.84%) in May than in October (31.24%). Also, mean infestation rate was significantly lower in 2013 than in 2015. The possible factors responsible for the observed variation are discussed.
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