الفهرس 
Mites associated with ornamental plants
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Abstract
Population dynamics of Tetranychus urticae and Euseius scutalis on Hibiscus sabdarriffa, Mentha piperita, M. vridis, and Synogonium podopyllum were recorded from September 2014 to September 2015 at Qualyubia and Giza governorates. A positive correlation between population densities of both mites and weather factors was occurred. The results improved that population of T. urticae and E. scutalis increased to high numbers in November and December, after word it decreased in March and April. Eleven species belonging to nine genera and seven families were identified from the previous plants at the same regions, where S. podophyllum plants has the highest number of total count of soil mites (60.44%) as predacious, fungivorous, and free living followed by (40.29%) in H. sabdarriffa; while the lowest were noted in M. piperita (27.43%) and M. vridis (28.65%). The high values of M. piperita essential oil were on M. vridis plants at LC50 in Lower limit (ml/ml 0.78811.313ol L-1 air) and in Upper limit (ml/ml 1.516 ol L-1 air). The low values of M. vridis essential oil were on M. piperita plants at LC50 in Lower limit (ml/ml0.7502ol L-1 air) and in Upper limit (ml/ml1.5517ol L-1 air), The estimated lethal concentration value was 1.146(ol L-1 air) for the two tested essential oils.The number of respiratory stomata in M. vridis was more than in M. piperita. Respiratory stomata diameter in M. vridis and M. piperita were much close. Trichomes length in M. vridis was longer than in M. piperita. Diameter of oily glands on upper and under surfaces in M. vridis was larger than in M. piperita. The mites selected between oily glands, trichomes and respiratory stomata in both mint species when feeding. Number of oil glands was more in M. vridis than in M. piperita. Histology of M. viridis and M. piperita leaves showing the differences between two species in leaf structure. The most important leaf structure in aromatic plants is oily glands as found in the external parts (both upper and lower epidermis)