Insecticidial effects of essential oil and plants extract of Carum copticum C.B. Clarke on Sitophilus oryzae L. (Col.: Curculionidae)
Subject Areas :
Keywords: Essential Oil, Sitophilus oryzae, fumigant toxicity, plant extract, contact toxicity, Carum copticum,
Abstract :
Recently, there has been a growing interest in research concerning the possible use of plant extracts as alternatives to synthetic insecticides. In this research, the insecticidal effects of Carum copticum essential oil and extract against rice weevil adults were investigated in laboratory condition. Essential oil was extracted through distillation with water using Clevenger apparatus and methanol extract of this plant was prepared. Tests of randomized complete block included six concentrations and three replications for essential oil (fumigant toxicity) and five concentrations and three replications for extract (contact toxicity) along with control treatment for both at 27±1ºC, 65±5% RH and darkness. LC50 values were calculated by SPSS.21.0 software which presented the value of LC50 of Carum copticum essential oils after 48 h, 187.35± 0.40 µl/l air and the value of extract after seven days were calculated 24.07± 0.08 ppm on rice weevil adults. Results showed that increasing the concentration of essential oil and extracts increased the mortality rate in both cases. The results also showed that essential oil and extracts of Carum copticum are effective biological sources which can effectively protect stored grain from infestation by the rice weevil; although for application of these combinations further research may be needed.
