NDLI: Determination of an action threshold for the sugarcane internode borer,Chilo saccchariphagus indicus (Kapur) in Sri Lanka

Content Provider	Springer Nature Link
Author	Seneviratne, J. A. U. T. Keerthipala, A. P. Ariyawansha, B. D. S. K.
Copyright Year	1999
Abstract	A damage level-based Action Threshold (AT) level was determined for the sugarcane internode borer (INB)Chilo sacchariphagus indicus (Kapur) in Sri Lanka. Two experiments, one in 1997/ 1998 as early planting crop and the other in 1999/2000 as late planting crop were conducted with the variety Co 775 at Uda Walawe, Sri Lanka. The experiments included maintenance of Chlorpyrifos-sprayed and control plots to measure cane yield at different infestation levels of INB. Cane yield losses were determined at different damage levels. Variation of damage levels and cane yields was tested by ANOVA. Effect of INB on cane yield was studied by correlation and regression analysis and the regression equations were used to estimate net revenue for determining AT. The highest damage level in the early- planted crops selected for chlorpyrifos spraying was 35 percent bored internodes and that for control was 33%. In the late-planted crop, the highest damage levels for the plots selected for chlorpyrifos spraying and control were 40% and 43%, respectively. The cane yield losses of the insecticide-sprayed and unsprayed plots at harvest were 2.6% and 26.8% respectively, in the early planted crop and those for late planted crop were 3.1% and 32.7%. There was a strong negative correlation between cane yield and damage level. The AT for the internode borer was found to be 13 - 15% bored internodes.
Starting Page	45
Ending Page	52
Page Count	8
File Format	PDF
ISSN	09721525
Journal	Sugar Tech
Volume Number	3
Issue Number	1-2
e-ISSN	09740740
Language	English
Publisher	Springer India
Publisher Date	1999-01-01
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sugarcane borer Chilo sacchariphagus economic thresholds action thresholds Sri Lanka Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science

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