The effects of sublethal doses (LC25) of fennel and pennyroyal essential oils on biological parameters of Dubas bug, Ommatissus lybicus (Homoptera: Tropiduchidae)

Subject Areas : entomology and othea arthropods

A.  Dehghan ¹ (Department of Entomology, Islamic Azad University, Science and Research Branch, Tehran, Iran)
A.  Payandeh ² (Department of Plant Protection, Faculty of Agriculture, Islamic Azad University, Bam Branch, Bam, Iran)
S.  Imani ³ (Department of Entomology, Islamic Azad University, Science and Research Branch, Tehran, Iran)
M.  Shojaei ⁴ (Department of Entomology, Islamic Azad University, Science and Research Branch, Tehran, Iran)
H.  Ostovan ⁵ (Department of Plant Protection, Faculty of Agriculture, Islamic Azad University, Shiaz Branch, Shiraz, Iran)

Received: 2016-09-18 Accepted : 2017-03-05 Published : 2017-05-22

Keywords:

Abstract :

Dubas bug, Ommatissus lybicus,is one of the serious pest of palm trees throughout the world and Iran. Pesticides are applied in highly infested areas. In order to risk of pesticides, it is necessary for safe alternatives. The aim of this study was the evaluating of sublethal (LC25) effects of fennel and pennyroyal essential oils on life table parameters of Ommatissus lybicus using two-sex life table. The LC25 values for fennel and pennyroyal essential oils were 23 and 30 µL/L, respectively. The results show that the essential oils caused the significant decreasing of fecundity, oviposition days and immature survival rate of Dubas bug. The highest and lowest immature stages period was on fennel (76.09±0.21 days) and control (73.88±0.24 days). Also, the highest adult longevity was on control (16.63±0.32) and the lowest was on fennel (16.00±0.42). The total developmental time of Dubas bugs was significantly decreased in essential oil treatments. Therefore, essential oils decreased the life table parameters including r, λ and R0, significantly. The essential oils treatment decreased survival rate and life expectancy of Dubas bug. The lowest survival rate, mxj, exj were observed in pennyroyal treatment. Our results showed that the pennyroyal essential oil was more effective than fennel essential oil on biological parameters, survival rate and fecundity of Dubas bugs.