Life Table Based ETs and Time Series for Sustainable Management of Spilosoma obliqua Walkar on Jute

Nayan Roy


Stage-specific two-sex pooled life table, nutritional ecology and economic thresholds (ETs) based time series of a major pest of jute, S. obliqua Walkar (Lepidoptera: Arctiidae), was investigated on two jute species (Chorchorus olitorious and C. capsularis) during 2017-2019. The population and feeding indices of S. obliqua were significantly (F1,4 8.592,P<0.05) affected by the host phytoconstituents in terms of host suitability or susceptibility (C. olitorious<C. capsularis). The average ET was 3.787±1.539 pests plant-1on C. capsularis which was significantly lower (F1,4=9.530, P<0.05) than C. olitorious (4.323±0.897 pests plant-1) due to higher host preference by S. obliqua. For a single pest per plant, the possible time (Tt) to reach ET was 14.781±5.973 days on C. capsularis which was lower than that in C. olitorious (16.456±2.522 days). Host preference and population dynamics-based ET calculation of S. obliqua could thus support time-based management strategy and trap cropping for sustainable pest management.


Population ecology; Spilosoma obliqua; Chorchorus olitorious; C. capsularis; phytoconstituents; ETs; CSs; CSPM

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