الفهرس 
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Abstract
A greenhouse experiment was carried out to investigate the reaction of seven medicinal and aromatic plant species i.e. Coleus blumei, Ocimum basilicum, Zinnia elegans, Petroselinum hortense, Apium graveolens L, Matricaria chmomilla and Salvia officinalis to Meloidogyne incognita infection through certain plant growth parameters; and nematode reproduction and development under green house condition. Results reveal that all growth parameters of such tested plants were remarkably reduced by M. incognita infection to various extents. Among the medicinal and aromatic plants tested, Matricaria chmomilla showed the highest reduction percentage values of total plant fresh weight 71.47 % and shoot dry weight 37.5%. Meanwhile, basil plant was moderately affected by nematode infection since their plant growth parameters i.e. fresh weight of whole plant as well as shoot dry weight showed the values of 28.57and 30.3%, respectively. Moreover, coleus and parsley plants gave the least percentage values for the same measurements that averaged 21.3 and 14.7 for the former and 22.72 and 17.64 for the later, respectively.
It is worthy to note that the lowest number of galling on root system of basil plants was recorded with arabic gum+seaweed extract+cabbage leaves, followed by ginger oil + seaweed extract +guava leaves, then arabic gum + seaweed extract+ oxamyl with the values of reduction percentages 85.83%, 83.33% and 82.25%, while the least value in this percentage was obtained when plants were treated with basil oil concomitant with seaweed extract and guava leaves (53.33%). The lowest number of egg-masses on roots was recorded with arabic gum+seaweed extract+cabbage leaves, followed by ginger oil + seaweed extract +guava leaves then arabic gum + seaweed extract+ oxamyl with percentage of reduction 86.42%, 83.06% and 78.26%, respectively.