Vol. 7, Issue 8, Part G (2025)

The present research investigation entitled carried out in kharif season of 2024-25 at Seed Technology and Research Unit field, Dr. PDKV Akola. Experimental plot treated with seed treatment thiamethoxam 25 WG @ 3 g/kg seed and one cover spray of thiamethoxam after initiation of sucking pests. The biorationals treatments namely Bacillus thuringiensis 1 kg ha-1, Neem oil 2%, Dashparni ark 10% (125 ml/10 lit.), Beauveria bassiana 1×108 @ 40 ml/10 lit., Metarhizium anisopliae 1×108 @ 40 ml/10 lit., NSE 5%, Quinalphos 25EC 20 ml/10 lit used for two spray, 1st spray at 35th DAE and 2nd one at 50th DAE. The mean effect of different treatments on Maruca vitrata found a lowest larval population in treatment plot T7 (Quinalphos 25EC 20 ml/10 lit.) which recoded 0.89 larvae/plant. Then effective treatments shown were T6 (NSE 5%) and T1 (Bacillus thuringiensis 1 kg ha-1) recorded a larval population 3.16 and 3.49 larvae/plant. The effect of these biorationals on population of natural enemies like Ladybird beetle and Spider found was beneficial. 
The effect of various biorationals on per cent pod damage of Maruca vitrata, effective treatment found was T7 (Quinalphos 25EC 20 ml/10 lit.) which recorded a pod damage 8.02 per cent followed by treatments T6 (NSE 5%) and T1 (Bacillus thuringiensis 1 Kgha-1) recorded a damage of 8.10 and 8.60 per cent. Yield and incremental cost benefit ratio of various biorationals treatments tested against the pod borers of black gram indicated that highest yield of black gram was recorded in treatmentT7 (Quinalphos 25EC 20 ml/10 lit.) was 8.80q/ha followed by treatments T6 (NSE 5%), T2 (Neem oil 2%) and T1 (Bacillus thuringiensis 1 Kgha-1) recorded yield 8.60 q/ha, 7.20q/ha and 7.00 q/ha. The highest ICBR was obtained in treatment T7 (Quinalphos 25EC 20 ml/10 lit.) (1:9.61), followed by treatment T6 (NSE 5%) was (1:3.05), T1 (Bacillus thuringiensis 1 Kgha-1) ranked third with (1:2.41) ICBR.