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Two field experiments were conducted during Kharif, 2010 and 2011 to evaluate the bio-efficacy and
economics of certain insecticides against gram pod borer, Helicoverpa armigera (Hubner) on
pigeonpea. Experimental results showed that the pod damage due to pod borer, H. armigera was
lowest (5.9%) in plots treated with acetamiprid and dimethoate, followed by fipronil (6.6%) and
thiamethoxam (7.2%) with 42.2, 42.2, 35.3 and 29.4 per cent reduction over control respectively.
The untreated plot has recorded maximum pod damage of 10.2%. Highest grain yield was recorded
in fipronil treated plots (4.5 q/ha), followed by thiacloprid (4.2 q/ha) and dimethoate (4.0 q/ha) with
50.0, 40.0 and 33.3 per cent increase in yield over control respectively as against the minimum yield
of 3.0 q/ha in the untreated check. However, the ICBR was highest in thiamethoxam (1: 7.8) and
dimethoate (1: 6.2), followed by acetamiprid (1: 4.1) and thiacloprid (1:3.4).
Key words: Helicoverpa armigera, insecticides, pigeonpea.