Investigations on the Effects of Five Different Plant Extracts on the Two-Spotted MiteTetranychus urticaeKoch (Arachnida: Tetranychidae)

Abstract

Two-spotted mite, Tetranychus urticae Koch (Arac.: Tetranychidae), is an economic pest worldwide including Turkey, causing serious damage to vegetables, flowers, and fruit crops. In recent years, broad-spectrum insecticides/miticides have been used to control this pest in Turkey. Control is difficult mainly due to resistance to conventional pesticides. This study was conducted to determine efficacy of pesticides extracted from five different plants [i.e., Allium sativum L. (Amaryllidaceae), Rhododendron luteum S. (Ericaceae), Helichrysum arenarium L. (Asteraceae), Veratrum album L. (Liliaceae), and Tanacetum parthenium L. (Asteraceae)] against this mite. Bioassays were tested by two different methods to determine the effects of varying concentrations. Experiments were performed using 3 cm diameter leaf disk from unsprayed bean plants (Phaseolus vulgaris L.). In addition, the effects of the extracts on reproduction and oviposition were investigated. The extract yielded high mortality. In the lowest-concentration bioassays, the adult mites laid lower numbers of eggs compared to the untreated control. No ovicidal effect was observed.

Effect of Phytochemicals Against Different Pest: A Review.

“…The insecticidal property in these plants is due to the presence of different compounds i.e. menthol, limonene, cineole and isomenthone in pepper mint while α and β pinene, limonene and caryophyllene in black pepper [27]. Insecticidal activities of these compounds were tested against larval as well as on adult stages of rice weevil.…”

Acaricidal Activity of Extracts of Juglans regia L. on Tetranychus urticae Koch (Acari: Tetranychidae)

“…For example, Erdogan et al [27] reported that extracts of five different plants showed high mortality on T. urticae. Similarly, Numa et al [28] found out that the extracts of Cnidoscolus acantifolius leaves caused the rate of high mortality (92%) on larva and adult of T. urticae.…”

The Acaricidal Effect of Ethanolic Extracts ofChenopodium quinoaWilld. onTetranychus urticaeKoch (Acari: Tetranychidae)

“…1% w/v) in 2 ml of solution for 30 s (Jeon et al 2010). Excess liquid was removed and the disks were dried at room temperature (25 °C for 0.5 h) (Sivira et al 2011;Erdogan et al 2012). The leaf discs were bordered with glue (Vargas et al 2002) to prevent mite escape and placed on moist cotton in Petri dishes (Sivira et al 2011).…”