Role of Different Thymus Essential Oils on Feeding Performance of Leptinotarsa decemlineata Say, 1824 (Chrysomelidae: Coleoptera)

Abstract

The Colorado potato beetle, Leptinotarsa decemlineata Say, 1824 (Chrysomelidae: Coleoptera), is a major problem for conventional potato production in all over the world. Bioactive molecules that originated from plants, have long been claimed as alternatives to synthetic chemicals for pest management Similarly, we investigated antifeedant effect of essential oils obtained from three different Lamiaceae species; Thymus transcaucasicus RONNIGER, Thymus pseudopulegioides KLOKOV and DES.-SHOST, Thymus leucotrichus HAL. against L. decemlineata Say, 1824 (Chrysomelidae: Coleoptera) larvae. T. leucotrichus showed the most powerful and weakest antifeedant effect of the three plant species in different doses (r = 0.409, P < 0.01). The highest AFI value (AFI = 65.548) was obtained on the third day at 2000 ppm (P < 0.05) and the lowest AFI value was measured on the second day at 1000 ppm (AFI = 0.560). According to these results, T. leucotrichus essential oil is the most effective phytochemical against L. decemlineata larvae.

Repellent activity of Tanacetum parthenium (L.) and Tanacetum vulgare (L.) essential oils against Leptinotarsa decemlineata (Say)

“…Antifeedant activity of EOs was achieved at lower doses when compared to water and methanolic extracts, which can be explained by differences in composition and the concentrations of active ingredients. Comparing our results on the AFI obtained after 3 days of L. decemlineata exposure to 0.5% concentration of Tanacetum EOs with the results of other authors revealed that Tanacetum EOs were stronger antifeedants than T. leucotrichus EO and the methanolic extract of Humulus lupulus (Gökçe et al ., 2012; Bekircan et al ., 2015), while the hexane-ethylacetate-methanolic extracts of Achillea millefolium and H. lupulus induced similar antifeedant response (Alkan et al ., 2015).…”

“…Many studies have shown antifeeding and avoidance behaviours of L. decemlineata in response to different plant extracts and EOs (González-Coloma et al ., 2006; Pavela, 2010; Gökçe et al ., 2012; Bekircan et al ., 2015). These types of behaviours are induced by compounds that hinder recognition of host-indicating odours and thus host acceptance for oviposition and feeding (Schröder and Hilker, 2008).…”

“…Again, these behavioural responses depended on EO concentration. Similarly, a dose-dependent antifeedant activity in L. decemlineata was recorded for water and organic solvent extracts of T. vulgare (Hough-Goldstein, 1990; Kutas and Nádasy, 2005) and other plant species (Gökçe et al ., 2012; Alkan et al ., 2015; Rusin et al ., 2016), and for the EOs of Satureja hortensis , Thymus transcaucasicus , T. pseudopulegioides and T. leucotrichus (Pavela et al ., 2009; Bekircan et al ., 2015). Antifeedant activity of EOs was achieved at lower doses when compared to water and methanolic extracts, which can be explained by differences in composition and the concentrations of active ingredients.…”

“…Many studies have reported repellent, antifeedant and insecticidal activities of EOs and other secondary metabolites, as well as their influence on various fitness and biochemical/physiological traits of insects (Szczepanik et al ., 2005; Isman, 2006; Pavela et al ., 2009; Rattan, 2010; Kim and Lan, 2011; Jumbo et al ., 2014; Kiran et al ., 2017; Tak and Isman, 2017). Insecticidal and antifeeding effects of plant extracts and EOs have been recorded in L. decemlineata (Kostić et al ., 2007; Gökçe et al ., 2012; Bekircan et al ., 2015). Compared to conventional insecticides, the use of EOs in pest management has several advantages.…”

Antifeedant Effects of Essential oil of Mentha longifolia subsp. longifolia L. HUDSON (Lamiaceae) on Subcoccinella vigintiquatuorpunctata L. (Coleoptera: Coccinellidae)

“…Essential oils obtained from several plant species belongs to Labiatae family in Turkey has a potantial to pest control and antifeedant affect. Studies have been conducted to determine effect of these essential oils on both eggs, adults and larvae of pests [7,8,9]. In the literature, plant extracts and essential oils obtained from M. longifolia subsp.…”