Fumigation toxicity and oviposition deterrency of four plant essential oils on cowpea beetle

Subject Areas : Plant Protection

Jahanshir Shahkarami ¹ , Majid Fallahzadeh ² , Samira Almasi ³

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Received: 2011-04-24 Accepted : 2012-02-15 Published : 2011-02-20

Keywords:

Abstract :

In order to find alternatives for conventional pesticides, the fumigant toxicity and ovipositional  deterrency of essential oils of summer savory, pennyroyal mint, ostokhodus and rosemary were tested against adults of cowpea beetle Callosobruchus maculates F. (Col.: Bruchidae). The experiment was conducted using a completely randomized design with six concentrations and five replications. Experiment was carried out at 30 ± 2 ˚C and 60 ± 5% R. H. under dark condition. Concentration of 560 µl/lair  essential oils of summer savory, pennyroyal mint, ostokhodus and rosemary caused 95.78, 87.78, 57.33 and 65.11% mortality of adults, respectively. LC50 values of essential oils of summer savory, pennyroyal mint, ostokhodus and rosemary were found to be 69, 106, 322 and 205 µl/l on adults, respectively.  Essential oils of all tested plants, showed significant reduction of ovipositional rate of  cowpea beetle.  The highest concentration (190 µl/lair) of essential oils of  summer savory, pennyroyal mint, ostokhodus and rosemary caused 83.22, 92.45, 62.34 and 73.24% ovipositional  deterrency, respectively. Essential oils of summer savory and pennyroyal mint showed the highest control on cowpea beetele. Therefore they could be recommended as safe pesticides for control of storage pests.

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