author(s)
Sushmita TH, MK Gupta, KI Singh and Karthik S

abstract
The contact toxicity of plant volatile oils of ginger oil (Zingiber officinale), patchouli oil (Pogostemon cablin), garlic oil (Allium sativum), cinnamon oil (Cinnamomum zeylanicum) and lemon oil (Citrus limon) were evaluated at 0.01%, 0.05%, 0.1%, 0.5% and 1.0% against the pulse beetle, Callosobruchus maculatus (F.). The results indicated that Zingiber officinale was found more effective and exhibited toxicity against the insects followed by Cinnamomum zeylanicum oil. The contact toxicity of Cinnamomum zeylanicum oil recorded lower egg hatching of 5.00% which was obtained in higher concentration of 1.0% and Zingiber officinale showed no hatching of eggs at higher concentration of 0.5% and 1.0%. The larval mortality of 100% were found in Cinnamomum zeylanicum, Zingiber officinale and Allium sativum in higher concentration of 0.5% and 1.0% respectively. Adult mortality were found highest in Cinnamomum zeylanicum resulting 90.0% at higher concentration of 1.0% followed by Zingiber officinale which recorded 85.0% and Pogostemon cablin which obtained 82.50% respectively. So, all the five plant volatile oils were found to be effective in different stages of the insect and these plant volatile oils can be considered as an alternative in the management of Callosobruchus maculatus.