Effect of Dietary Azasteroids on the Growth and Development of the Gram Pod Borer Helicoverpa armigera (Hubner)
DOI:
https://doi.org/10.55446/IJE.2022.180Keywords:
Helicoverpa armigera, 25-azacholestane, 25-azacoprostane, sterol, cholesterol, larval duration, larval mortality, pupal duration, pupal mortality, adult emergence, metabolism, utilization, inhibition, IPMAbstract
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.
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