STUDIES ON THE OCCURRANCE OF SEEDLING BLIGHT, ROOT ROTS AND DISEASE SEVERITY OF SUGAR BEET PLANTS

Document Type : Original Article

Authors

1 Dept. or Af!tic. Botany, Faculty of Agriculture, Kafr EI-Sl1eikh, Tanta University.

2 Plant Pathol. Research lnstitute, ARC, Giza.

3 Dcpt. 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.

Keywords

Journal of Plant Production
Volume 27, Issue 9
September 2002
Pages 5807-5821

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