Feeding deterrence and insecticidal activity of phorbol esters in Jatrophacurcas seed oil against Dinoderus minutus. (Coleoptera: Bostrychidae)
Jyothna B, Rajaram V, Manivannan S, Somashekar D
Dinoderus minutus (Coleoptera: Bostrychidae) is a serious pest of bamboos in the tropical regions of the world. The contact toxicity of J. curcas oil was evaluated against D. minutus using 20, 40, 50 and 60% concentration.The results showed that 60% Jatropha seed oil caused 100% mortality over 96 h exposure. The mortality of bamboo borers was due to bioactive compounds like phorbol esters present in Jatropha seed oil. The bamboo blocks (5x 3.5cm2) were treated with 60 and 100% Jatropha seed oil to examine the feeding deterrence and mortality of D. minutus. The per cent reduction in the weight loss of bamboo blocks owing to Jatropha seed oil treatments at 60 and 100% concentrations in comparison to control were 15.69 and 9.80 percent respectively. The maximum wood protection against D. minutus was observed at 100% Jatropha seed oil concentration.