1Maitreyi College, University of Delhi, Delhi, 110007, NCT Delhi, India
2Ramjas College, University of Delhi, Delhi110007, NCT Delhi, India
Department of Zoology, Dyal Singh College, University of Delhi, Delhi, 110007, NCT Delhi, India
*Email: ranjana.saxena@dsc.du.ac.in (corresponding author)
Online Published on 17 May, 2023.
Effect of two azasteroids, 25-azacholestane and 25-azacoprostane was studied on growth and development of an economically important phytophagous pest, Helicoverpa armigera (Hubner) causing extensive damage to crops like cotton, pigeon pea, chickpea and others. 25-Azacholestane caused an increase in larval mortality (36% in control to 52% at 25 ppm), decrease in pupation (64% in control to 48% at 25 ppm) and decrease in adult emergence (60% in control to 28% at 25 ppm). Larval and pupal duration was significantly more as the azacholestane concentration increased to 25 ppm (p<0.001). Similar results were observed in case of 25-azacoprostane treatment also. Both the azasteroids were found to have inhibitory effect on the growth and development of H. armigera. Formation of larval-pupal intermediates and adults with abnormal wings was also observed. Addition of 0.1% cholesterol along with 10 ppm of 25-azacoprostane in the diet reversed the inhibitory effect of the azasteroid.
Helicoverpa armigera, 25-azacholestane, 25-azacoprostane, Sterol, Cholesterol, Larval duration, Larval mortality, Pupal duration, Pupal mortality, Adult emergence, Metabolism, Utilization, Inhibition, IPM
