الفهرس 
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Abstract
The host suitability of ten medicinal plant species i.e. carnation, celery, coriander, dill, geranium, peppermint, periwinkle, rose geranium, thorn apple and thyme to Meloidogyne incognita infection indicated that none of the tested plant species was immune and the incidence varied from plant species to another. Their host category was determined through the relationship between host plant growth response (% reduction of total plant fresh weight) or gall index and nematode reproduction factor (RF). Carnation and thyme were rated as highly susceptible (HS), since their plant growth parameters were highly affected along with reproduction factor >1. Rose geranium was rated as moderately intolerant (IT), since its plant growth character was moderately affected along with reproduction factor <1 . Geranium was rated as fairly resistant (FR), since its plant growth criterion was moderately affected with reproduction factor >1. Dill, celery, coriander, thorne apple and periwinkle were classified as resistant (R) hosts, since their plant growth were not affected with reproduction factors <1, depending upon the host suitability designations used.
The impact of nine medicinal and aromatic plant products as ground-oil-seeds i.e. fenugreek, arugula, coriander, celery and dill; and dried leaf powders i.e. peppermint, rosella, periwinkle and throne apple separately in comparison with oxamyl on M. incognita infecting eggplant cv. Black Long under greenhouse conditions, indicated that all tested materials obviously improved plant growth parameters of eggplant plants and significantly diminished nematode criteria as well comparing to nematode alone. Fenugreek as ground-oil-seeds application represented the maximum percentage increase values of plant length (54.3%), total plant fresh weight (177%), shoot dry weight (142.7%) and number of leaves/ plant (117.4%), whereas, ground-oil-seeds of dill gave the least percentage increase values in this respects. However, peppermint as powder application represented the maximum increase values of ameliorating plant length (53.6%) , total plant fresh weight (158.4%), shoot dry weight (138.8%) and number of leaves / plant (108.7%), respectively, followed by that of rosella and throne apple, whereas, periwinkle showed the least values of the same plant, respectively. Oxamyl ranked first and surpassed other tested application in percentage increase values of the same plant growth criteria, respectively.
Concerning nematode parameters nematode population density and rate of nematode reproduction were significantly affected. Fenugreek treatment overwhelmed other tested ground-oil-seeds in suppressing nematode population density (81.1%), root galling (92.8%) and eggmasses (92.0%) number, followed by arugula application, whereas celery or coriander gave the intermediate reduction values. However, the least values of the same nematode parameters was achieved by dill ground-oil-seeds treatment with values of 42.9, 40.0 and 37.8 for final nematode population, number of galls and eggmasses, respectively. Moreover, peppermint treatment surpassed other tested dried leaf powder of medicinal tested plant diminishing final nematode population (80.5%), number of galls (84.0%) and eggmasses (86.7%), followed by rosella powder ( of 78.1, 84 and 84.4%) for the same nematode parameters, respectively, comparing to nematode alone. However, periwinkle powder gave the relatively low value of final nematode population density (60.5%) but with high values of number of galls (80.0%) and eggmasses (82.2%) than of thorn apple in the latter two nematode criteria, respectively, comparing to nematode alone. Meanwhile, oxamyl gave the maximum values in suppressing the same nematode parameters with values of 91.9 ,94.0 and 93.3%, respectively and ranked first among all nine tested materials, comparing to nematode alone. Treatments of ground-oil-seeds of fenugreek and peppermint powder represented the maximum values of diminishing nematode criteria accompanied with the lowest values of RF that amounted 0.86 and 0.89 vs 4.6 for nematode alone, respectively, whereas the minimum values of reducing nematode criteria was achieved by dill or coriander ground-oil-seeds with high values of RF that amounted to 2.6 each vs 4.6 for nematode alone, respectively. However, oxamyl gave the lowest value of nematode reproduction factor (0.37) vs 4.6 for nematode alone.
Regarding the impact of root-dipping of eggplant cv. Black long seedlings separately for 15 or 30 minutes within aqueous leaf extracts of peppermint, periwinkle and rosella as well as arugula ground-oil-seeds solely or mixed with oxamyl at their half doses each in comparison with oxamyl at full recommended dose under the stress of M. incognita infection in the greenhouse conditions ( 28±3°c ). Results revealed that all tested materials either solely or mixed with oxamyl at half doses each ameliorated the increments percentage increase values of plant parameters and diminished nematode criteria as well, comparing to nematode alone.. Obviously, eggplant plant growth parameters were positively increased as the time of root dipping treatments either solely or mixed ones increased from 15 to 30 minutes, comparing to nematode alone. Periwinkle applications either solely or mixed ranked first with the maximum increments values of 39.1 and 43.3% or 52.3 and 55.2%; and 48.8 and 68.9% or 80.3 and 85.0%; and 58.0 and 52.0% or 98.7 and 118.6 % for plant length , total plant fresh weight and shoot dry weight, by root dipping treatment for 15 and 30 minutes, respectively, followed by rosella treatments, arugula ground-oil-seeds and then periwinkle extracts treatments. Oxamyl gave considerable percentage increase values for plant growth criteria.