الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The potential for induction of systemic resistance to sugar-beet var. Negma infected with M. incognita and treated with Bio-arc ( a commercial formulation of the B. megaterium) at the rate of 5, 10, 15 and 20 ml and Nemastrol (a commercial formulation of active ingredients) at the rate of 0.25 ml and was investigated in two soil types. Results revealed that all treatments with tested rates were found to have nematicidal activity against nematode infection and improved plant growth parameters of sugar-beet with various degrees. Nemastrol + Bio-arc at the rate of (0.25+ 20 ml) proved to be the best for enhancing performed significant improvement in plant growth parameters in terms of shoot length (92.6 , 127.5%) and total plant fresh weight (91.7, 370.4) of sugar-beet grown either in clayey or sandy soil, respectively. As for nematode developmental and reproduction, Nemastrol performed the best and significantly suppressed total nematode population (RF= 1.9, 2.2), root galling (RGI= 3.0, 3.0), number of eggmasses (EI= 3.0, 3.0) and number of eggs / eggmass (Red. % = 76.5, 74.5) in clayey and sandy soil, respectively. However, concomitant treatment showed better results than did Bio-arc alone at four tested rates. Among the concomitant treatment the greatest reduction in total nematode population was recorded with clayey and sandy soil receiving the dual application of Bio-arc (20ml) and Nemastrol (0.25ml) with reproduction factor 2.2, 2.6 and reduction percentages reached 92.8, 92.6%. On the other hand, total nematode population was significantly suppressed with Oxamyl introduced to clayey soil (RF= 1.4) and sandy soil (RF= 0.8) relative to control plants where RF= 30.0 and 35.9, respectively. Nevertheless, number of eggs/ eggmass were significantly suppressed with Oxamyl application with percentage of reduction amounted to 81.3 and 91.5% in clayey and sandy soil respectively.