الفهرس 
Isolation, Identification and PathogenicityOnly 14 pages are availabe for public view
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Abstract
On the basis of the results obtained in the present study about the effect of different organic and inorganic sources of N on blast disease incidence, four organic manure sources i.e. farmyard manure (FYM), goat, poultry and rabbits, each at the rates of 10, 20, 30 and 40 m3/fed., were compared to urea at 0, 20, 40 and 80 kg Nlfed. Blast infection development and the yield of rice cvs. Giza 171 and Giza 176 was studied in two seasons 1992 and 1993. Higher infection was obtained from the application of poultry and goat manures, while less infection was observed with the application of rabbit and farmyard manures as well as urea at the rate of 40 kglfed. This was true for both leaf and panicle infections to both cultivars in the two growing seasons..The highest grain yield was obtained from FYM application at the rate of 10-30 m3/fed. The use of 40 kg N/fed. as urea showed lower infection than higher rates. The corresponding organic manure was 30 m3/fed. FYM, 20 m3/fed. goat, 20 m3/fed. rabbits and 10 m3/fed. poultry manur for both leaf and panicle infections. The obtained results also showed that the higher the rates of N organic or inorganic fertilizers, the higher the blast disease severity. The present results indicated that the highest orain yield obtained as well as the least blast infection was occurred by the application of 10 m3/fed. farmyard manure plus 20 kg Nlfed. urea.