Relative Importance of some Natural Products acting as Pesticides Alternatives against Tetranychus urticae Koch, (Tertranychidae : Acari)

Eight kinds of natural botanical origin oils (three fixed and five essential) were investigated through lab. experiment and another field applied experiment on the Tetranychus urticae in kidney beans plantations.The two main techniques: 1 – dipping disc bioassay and 2- spray.Observations lasted along the life cycle.Number of dead individuals and their percentages during the first 3 days were taken as indicator for the ascending ranking of the eight kinds of oils, in comparison with water as a control.Results of the lab. experiments revealed that the eight investigated compounds were categorized in 3 groups: The first one include Ginger, Garlic and Thyme oil with mortality percentage 58.33, 53.33 and 52.22%, respectively. The second group, have a medium effect contains: Sun – flower seed, row cotton seed and linseed oil, respectively. The Third group contains basil and mandrine oil which recorded the lowest values directly before the control treatment.
Results also showed that the total numbers of dead individuals in dipping technique were considerably higher than those of spray case. The three (3) oils of first group were conducted in a field experiment to spray kidney been plantation in, Kafr el Tawila, village, Dakahila Governorate against T.urticae. Results showed that garlic oil was the highest effect followed with thyme and ginger oils, respectively.