Seasonal incidence, damage intensity and management of Ocimum leaf folder, Orphanostigma abruptalis on sweet basil (Ocimum basilicum)
2022
Kumar, Manoj | Rai, Dinesh | Kanth, Neeharika
Studies on seasonal incidence, damage intensity and management of leaf folder, Orphanostigma abruptalis on Sweet basil (Ocimum basilicum) revealed that the pest population was at its peak (4.4 larvae per plant) during 46ᵗʰ standard week of 2020 and the population started declining from 47ᵗʰ standard week of 2020. The damage intensity of leaf folder was assessed by comparing the yield of fresh herbage in treated and untreated plots at 90 DAT. In prophenophos 50 EC @ 1 ml/lit treated plot yield was 5755.5 Kg ha⁻¹ whereas in untreated plot yield obtained was 5465.5 kg ha⁻¹. The per cent herbage yield loss of 5.03% was recorded in untreated plot as compared to treated plot. Maximum mean number of larvae population of 5.0 per plant untreated plot. The highest protection was recorded in t T₅ - Azadirachtin 1500 ppm, 4 ml/l (41.75) followed by T₂ - NSKE 5% (39.93), T₃ - Neem oil 2% (37.45), T₄ - Karanj oil 2% (36.51), Whereas, least per cent control after spray at 14ᵗʰday was recorded in T₁ - Verticillium lecanii @ 4 ml/l (22.33) followed by T₆ - Castor oil 2% (25.09).
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