| Abstract: |
The present experiment consisted of two main parts, the first part aimed to study the survey and the relative densities of the insect pests and predators existing on mint , roselle and marjoram plants during 2006- 07 and 2007- 08 growing seasons at Abo-Kabir district, Sharkia Governorate. On mint plants 17 insect species belonging to 11 families and 7 orders were recorded, while 10 predaceous species belonging to 8 families and 6 orders were observed. On roselle plants 14 insect species belonging to 12 families and 6 orders were recorded, while 9 predaceous species belonging to 7 families and 6 orders were found. On marjoram plants 10 insect species belonging to 8 families and 5 orders were recorded, while 8 predaceous species belonging to 6 families and 4 orders were recorded. The influence of temperature and relative humidity on the numbers of the most abundant insect pests was studied. The insect pests infesting stored mint, roselle and marjoram were surveyed, where 8 insect species belonging to 6 families and 3 orders were observed. The economic injury levels of cotton aphid on roselle plants were studied. In the second part of the study the efficiency of NeemAzal-T/S formulation® and camphor oil against A. gossypii on mint plants under field conditions were determined, where the means of general effect of NeemAzal-T/S were 50.50, 65.82, 70.92 and 72.21% at the concentrations of 20, 40, 60 and 80 ppm in the first season, respectively. In the second season these percentages were 42.98, 51.78, 72.92 and 76.52% for the tested concentrations, alternatively. In case of camphor oil the mean percentages of accumulation effects were 23.59, 37.34, 40.21 and 57.84 in the first season, while they were 24.63, 29.02, 47.75 and 53.79% in the second season at concentrations of 200, 400, 600 and 800 ppm, respectively. The effects of camphor and thymol oils on the whitefly eggs hatchability were studied.
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