الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Potato plants and their tubers in Egypt are affected by one of the most notorious soil-borne pathogen, Ralstonia solanacearum which caused wilt in potato plants and brown rot in tubers. Control of bacterial wilt is very difficult as there is no effective curative bactericide. For this reason, need for a strict agricultural quarantine system is very important. This study was concerned with developed non traditional techniques as well as disease control using different save methods (crop rotation, mineral and bio-fertilizers, compost and mycorrhiza, essential plant oils and nano particles). Results revealed that the soil obtained from fields previously cultivated with Egyptian clover, rice, wheat and maize were the most effective ones in reducing disease incidence than other cultivated soil obtained from fields previously cultivated with groundnut and onion in Spunta, Diamont and Mundial potato cultivars under greenhouse conditions. The effect of different fertilizer mineral and bio-fertilizers on potato wilt incidence and severity was evaluated.Calcium superphosphate with phosphorine reduced wilt incidence, severity and increased weight of tubers. Also, increased polyphenoloxidase and peroxidase activity and total phenols in Spunta, Ariena and Hermes as compared with control treatment. The results also revealed that animal compost with mycorrhiza and mycorrhiza only were effective in reducing the disease than animal compost only in tested potato cultivars under greenhouse conditions. Anise oil was more effective in reducing the disease incidence and severity than other testes essential plant oils in Spunta and Hermes potato cultivars under greenhouse conditions. Chitosan nanoparticle was the most effective nanoparticles in reducing the disease incidence and severity of tomato as compared with control treatment. Morphological changes in bacterial cell structure were observed using transmission electron microscope (TEM). Anise oil and Chitosan nano particles at higher concentration cause cell wall rupture and degraded cellular components.