Acaricidal and sublethal effects of tobacco leaf and garlic bulb extract and soft soap on Tetranychus urticae Koch. (Acari: Trombidiformes: Tetranychidae)

Abstract

The ovicidal, adulticidal and fecundity effects of tobacco (Nicotiana tabacum L.) leaf extract, garlic (Allium sativum L.) bulb extract, soft soap and their binary mixtures were investigated against Tetranychus urticae Koch. (Trombidiformes: Tetranychidae) eggs and adult females under controlled conditions [25°C±1, 65±5% R.H. (mean±SD) and a photoperiod of 16L: 8D (Light: Dark)]. The concentrations used for the ovicidal and adulticidal effect were chosen after preliminary bioassays to obtained mortality rates equally distributed between 0%–100%. However, one concentration giving around 50 % percent adult mortality of each compound was tested for fecundity effect. Each stock solution was diluted separately with distilled water to give the desired different concentrations of each extract. The results showed that the tobacco leaf extract, the soft soap and the garlic extract+soap mixture were the most toxic against adult females. Although the garlic bulb extract had the lowest toxic effect, its mixtures with the soft soap and tobacco extract showed higher toxicity against the adults. Moreover, the tobacco application at the tested dose significantly reduced the T. urticae fecundity. It is also determined that the tobacco leaf and garlic bulb extracts have potential to be used in the control of T. urticae eggs. On the other hand, the ovicidal activity of soft soap can be increased by addition of the garlic extract. However, further investigation is needed to assess their phytotoxicity under greenhouse and field conditions. The efficacy of these compounds to natural enemies should also be measured.

Potential of Pre-Harvest Wastes of Tobacco (Nicotiana tabacum L.) Crops, Grown for Smoke Products, as Source of Bioactive Compounds (Phenols and Flavonoids)

“…In particular, its alkaloids were studied for their well-known effect against insect [16,17] or in the control of neurological diseases like Alzheimer [18] and Parkinson [19]. Tobacco leaf extracts were also reported to have insecticides effects against mites [20] and larva of the dengue vector mosquitos [21] or antifungal activity against Fusarium spp. [22].…”

Acaricidal activity of nishinda (Vitex negundo) leaf and garlic (Allium sativum) bulb extract against red spider mite, Oligonychus coffeae (Acari: Tetranychidae) in tea plantations of Darjeeling hill, West Bengal, India

“…It is now termed as pesticide with minimum risk, which may provide a safe and feasible alternative to synthetic pesticides. It is easily available and cost effective to farmers (Su and Mulla 1998;Panella et al 2005;Isman et al 2008;Akyazi et al 2018). It is well known that acaricidal effects of plant extracts are interconnected with their chemical compositions (Isman et al 2001;Singh et al 2001).…”

Effect of Neo-Boost Pesticide on Mortality and Development of Different Life Stages of Two-Spotted Spider Mite, Tetranychus urticae

“…In addition, its independent mode of action makes it attractive for integrative pest and pesticide resistance management of mite populations. Several biopesticides have been tested against T. urticae (Ahn et al, 1998;Akyazi et al, 2018). Biopesticides often do not have the same degree of effectiveness as synthetic pesticides (Copping and Menn, 2000).…”