El-Kazzaz,, M., El-Assiuty, E., Badr, M., El-Zahaby, H., Gouda, M. (2002). STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS. Journal of Plant Production, 27(9), 5807-5821. doi: 10.21608/jpp.2002.256607
M. K. El-Kazzaz,; E. M. El-Assiuty; M. M. Badr; H. M. El-Zahaby; M. E. Gouda. "STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS". Journal of Plant Production, 27, 9, 2002, 5807-5821. doi: 10.21608/jpp.2002.256607
El-Kazzaz,, M., El-Assiuty, E., Badr, M., El-Zahaby, H., Gouda, M. (2002). 'STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS', Journal of Plant Production, 27(9), pp. 5807-5821. doi: 10.21608/jpp.2002.256607
El-Kazzaz,, M., El-Assiuty, E., Badr, M., El-Zahaby, H., Gouda, M. STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS. Journal of Plant Production, 2002; 27(9): 5807-5821. doi: 10.21608/jpp.2002.256607
STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS
1Dept. or Af!tic. Botany, Faculty of Agriculture, Kafr EI-Sl1eikh, Tanta University.
2Plant Pathol. Research lnstitute, ARC, Giza.
3Dcpt. of Agtic. Botany, Tanta Faculty of Agriculture, Tanla University.
Abstract
Survey of seedling hlighl. root rots, and disease severity of sug;;u beet plants were earned out on sugar beet fields of four northern and mid Nile Delta Governorates. This survey revealed thDt seedling blight and root-rots otseases were dominant in all surveyed Governorates with various degrees or spread. however Kafe EI-Sheikl1 Governorate represented the first rank in this respect. Sclerotium rolfsi; followd by Rhizoctonia solaniwere the most frequent isolated fungi (rom diseased matertats collected during such survey, whIle Macrop < /em>flomillB pllaseolina, on the other hand, was the less frequent one. Fusarium OXyspolum, F. solan;, F. monilifom16 and some other unidentified run~1 were also recovered from Infected roots.
Studying pathogenicity revealed that S. rol(sii foliowed by R. solan; were the most destructive pathogens to the tested susoeptible cuUivar, cv. Kawmera under artiOcial Infection. M. pneseoune, on the contrary, had the least capability to infect beet plants.
Studying the varietal resistance of 15 cultivars to infection with damping-off and root-rots caused by S. rolfsii and R. so/ani indicated that all the tested cultivars were liusceptible with various degrees of susceptibility to these pathogens under greenhouse condilions. But, under natural infection, only sam of them were susceptible to infection (giving more than 6% infection). while the majority exhibited moderate resistance against infection by the two pathogens (giving less than 8% infection). Clear negative corelauon was found between infection percent and the root yield per plot.
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