PREDICTING RICE LEAFFOLDER DAMAGE AND YIELD LOSS IN IR 50 RICE BY MATHEMATICAL MODELLING

V. PANDI; P.C. SUNDARA BABU and C. KAILASAM

doi:https://doi.org/10.29321/MAJ.10.A00778

Madras Agricultural Journal

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PREDICTING RICE LEAFFOLDER DAMAGE AND YIELD LOSS IN IR 50 RICE BY MATHEMATICAL MODELLING

Author: V. PANDI, P.C. SUNDARA BABU and C. KAILASAM,

p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 85, Issue: jul-sep,

DOI:https://doi.org/10.29321/MAJ.10.A00778

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Abstract

The predicted damage and yield loss caused by rice leaffolders, Cnaphalocrocis medinalis (Guence) and Marasmia patnalis (Bradley) in microplot experiment during kharif 1996 showed that the yield loss was higher at the initial infestation by leaffolder larvae at 40 DAS than the infestation at 30 DAS. There was no proportionate increase in yield loss with increasing larval populations. The rate of yield loss due to an increment of one percent damage was more pronounced at 10 percent base level damage i.e., 10 to 11 percent than at higher base level damage of 20, 30 to 90 percent.

Keywords: Rice, leaffolder, damage, yield loss and modelling

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