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The cowpea weevil,  Callosobruchus maculatus  F. (Coleoptera: Bruchidae), is an important pest of stored cowpea,  Vigna ungiculata  (L.) Walpers (Fabales: Fabaceae), with ample distribution in tropical and subtropical regions. Many plant essential oils have a broad-spectrum activity against pest insects, and these oils traditionally have been used in the protection of stored products. In this study, the lethal and sublethal effects of essential oils from  Eucalyptus camaldulensis  Dehnh. (Myrtales: Myrtaceae)  and Heracleum persicum  Desf. (Apiales: Apiaceae) were evaluated on the adults of  C. maculatus  at 26 ± 1° C, 70 ± 5% RH, and a photoperiod of 16:8 L:D. The LC 50  values of  E. camaldulensis  and  H. persicum  were 56.7 and 219.4 µL/L air after 12 hr and 26.1 and 136.4 µL/L air after 24 hr of exposure, respectively. The LT 50  values of  E. camaldulensis  and  H.persicum  were 6.3 and 10.9 hr, respectively. The results showed that low lethal concentration (LC 20 ) of essential oils negatively affected the longevity, fecundity, and fertility of female adults. The sex ratio of  C. maculatus  offspring was not significantly affected by essential oils. Therefore, these essential oils can be suggested for controlling  C. maculatus  in storage systems. The introduction of essential oils into storage systems could potentially decrease seed losses.

journal of insect science

Lethal and Sublethal Effects of Essential Oils from<i>Eucalyptus camaldulensis</i>and<i>Heracleum persicum</i>Against the Adults of Callosobruchus Maculatus

Lethal and Sublethal Effects of Essential Oils fromEucalyptus camaldulensisandHeracleum persicumAgainst the Adults of Callosobruchus Maculatus