Effects of Different Plant Essential Oils on Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae: Bruchidae) Adults

• Main Authors: Alime BAYINDIR EROL, Ali Kemal BİRGÜCÜ
• Format: Article
• Language: English
• Published: Siirt University 2020-06-01
• Series: Türkiye Tarımsal Araştırmalar Dergisi
• Subjects: juniper essential oil; bean seed beetle; fumigant effect; essential oils; repellent effect
• Online Access: https://dergipark.org.tr/tr/pub/tutad/issue/54650/690512

Acanthoscelides obtectus (Say) (Coleoptera: Chrysomelidae: Bruchinae) is one of the important pests of the bean that facilitates the entry of other insects and microorganisms as a result of opening holes in the seed coat to feed with cotyledons. In this study, repellent and fumigant effects of different essential oils, such as juniper (Juniperus communis), tea tree (Melaleuca alternifolia), thyme (Thymus vulgaris), lavender (Lavandula hybrida), eucalyptus (Eucalyptus globulus) and garlic (Allium sativum), on A. obtectus adults were investigated. To determine the repelling effect, filter papers absorbed with essential oil and pure water were placed on each end of a transparent plastic tube and after 24 hours the orientation of adult individuals was followed. In order to determine the fumigant effect, filter papers impregnated with essential oil were fixed on the lids of the glass jars, and the numbers of living individuals in the jar were recorded on the 1st, 3rd, 5th and 7th days. In the first stage of the study, the repellent index (RI) of these essential oils was calculated as -9.68, 20.00, -25.00, -11.76, 17.39, and 18.18, respectively. The repellent index of these essential oils was statistically insignificant. In the second stage of the study, fumigant effects on A. obtectus adults were determined by using 1000, 3000, and 5000 ppm L-1 doses of each essential oil. As a result of the application of all doses of the essential oils used, no statistically significant difference was observed between the essential oils. The highest mortality rates were obtained by recording the 25.33%, 30.67%, 44.00%, and 62.67% mortality rates on the 1st, 3rd, 5th, and 7th days of the 5000 ppm L-1 dose of juniper essential oil, respectively. As a result, although there is no statistical difference between these essential oils in that both repellent effect and fumigant effects, pest control can be preferred in the way of not having negative effects on human and the environment.