AUTHOR(S)
K. Basavaraj1, Mohan I. Naik2, K.S. Jagadish1 . S. Geetha1 and Y.G.Shadakshari2

ABSTRACT

 Field investigations were conducted tocheck the efficacy of biorational and botanical formulations against capitulumborer, Helicoverpa armigera Hub. infesting sunflower. The resultsrevealed that significant differences existed between the treatments at twodays after first spray and third and seventh days after second spray. At threedays after second spray, lowest population of H. armigera was recordedin spinosad and profenophos treatments (0.05 per plant), followed by garlicchilli kerosene extract (GCKE) (0.11 larvae per plant) and V-Bt (Bacillusthuringiensis) (0.16 larvae per plant), however, untreated check recordedthe highest H. armigera larval population (4.53/plant). Among thedifferent biorationals, the V-Bt treatment recorded highest seed yield(3528 kg/ha.), volume weight (55.14 g/100ml) and oil content (37.78 %). Thecost: benefit analysis revealed that the highest benefit: cost ratio wasrecorded in Parthenium leaf extract treatment (37.29), whereas,intermediate C: B ratios were recorded in Neem seed kernel extract (20.17) >Pongamia seed kernel extract (12.54) > profenophos (8.81) > spinosad(8.36) > IPM module (5.34) > HaNPV (3.85) > V-Bt (2.49) >GCKE (1.48) > panchagavya (0.29) > Bt-Halt (0.04), in that decreasingorder. The findings throw light on the fact that biorationals viz., Bacillusthuringiensis, NSKE and PSKE, show promise in the suppression of H.armigera, besides being economical and ecofriendly.

DOI
https://doi.org/10.57182/jbiopestic.7.0.94-98

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