الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 346 |  |  |
| | | from | 346 | | |
Abstract
Cercospora Leaf Spot (CLS) disease of sugar beet caused by Cercospora beticola is a major menace for sugar beet cultivation prevalent in sugar. Survey studies were revealed that, the disease severity was more dangerous in the Suez governorate in two pivots in the Ksfarite )0.15 to 49.05%(during season 2016-2017.However in Ismailia governorate is not registered. The effect of three plant extracts on the CLS disease has been studied in vivo and in vitro showed the significant effect of reduction of CLS at high concentrations 30, 35 and 40%. Effect of spraying plant extracts on plants with two treatment before inoculation and after the inoculation, revealed a decrease in disease severity of CLS in both treatment, but it was lower in treatments before inoculation .Interaction between different concentrations of plant extracts and CLS linear growth was studied using thermal imaging technology by measuring thermal emissions from the treated PDA a new technique in plant pathology, results showed increases in colony temperatures in high concentrations and inhibited growth of Cercospora beticola. . The spectral behavior resulting from CLS disease in the sugar beet plant was studied using five techniques, spectral signature, band ratio, Vis, change detection and pathogenic zonation, using satellites and field data, results proved a significant relationship between CLS infection and spectral behavior comparisons of ground data with satellite data .