Interactive effect of rosemary oil and phosphine gas on pulse beetle, Callosobruchus chinensis L. (Coleoptera: Chysomelidae)
Vaishali P Sawant, Shyamkant S Munje and Yugal K Yadu
In this study, the toxic effect of locally available volatile oil of Rosemary, Rosemarinus officinalis L. (Lamiales: Lamiaceae) doses (5, 10 and 15 percent) alone and in combination with phosphine gas 4 ppm has been investigated against pulse beetle, Callosobruchus chinensis L. under laboratory conditions. The research work was carried out during September, 2017 to March, 2018 at the Regional Research Centre, Amravati (M.S.). Ninth homogenous susceptible generation of pulse beetle was taken as test insect. Percent mortality was observed at 20 minutes and 24 hours after exposure to fumigants. It was observed that percent mortality increased with increase in exposure period. Maximum mortality (100 percent) was observed in all the treatments of rosemary oil + phosphine 4 ppm after 24 hours of exposure. Minimum mortality of pulse beetle (26.67 percent) was observed in the treatment, rosemary oil 5 percent after 20 minutes of exposure and it was increased up to 70.00 percent after 24 hours of exposure to the treatment.