No 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.

Turkey has suitable ecological conditions to grow a wide variety of vegetables. This research was conducted to investigate mite species on cultivated vegetables that include bean (Phaseolus vulgaris L.

No abstract

The toxic and repellent effects of leaves, flower and seed extracts of Prunus laurocerasus L. (Rosaceae) were investigated against Tetranychus urticae Koch (Acari: Tetranychidae) under laboratory conditions. Extracts at three different concentrations (1 %, 5 % (v/v), 10 % (w/v)) for ovicidal and repellent effects against eggs and adult females, respectively and at five different concentrations (1 %, 2.5 %, 5 %, 7.5 % (v/v), 10 % (w/v)) for the contact toxicity against female adults were evaluated. The results showed that seed extract was the most effective compared to flower and leaf extracts. It was found that at 5 % and 10 % concentrations of seed extract, the repellent effects were 92 % and 100 %, respectively within the first 72 hours. At 10% concentration of seed extract, the ovicidal and adulticidal effect were 96.56 % and 100 %, respectively. Moreover, further concentration response trials showed that LC50 and LC90 values for the contact toxicity of seed extract on eggs and adult females were LC50=4.5 %, LC90=9.4 % and LC50=2.9 %, LC90=9.1 %, respectively. The result indicated that seed extract of P. laurocerasus has good potential to be used to control T. urticae. However, the impact of these extracts on natural enemies of T. urticae should also be needed further studies.