Study of the Effect of Black Leg Disease in Potato Production

Abstract

The susceptibility of 8 cultivars of potato to infection by black leg disease was studied using artificial inoculation with 10-4 CFU/ml from isolated bacterial. The results showed that all cultivars were susceptible at different levels, under greenhouse and filed condition. Diamond was found to be the most susceptible cultivar to blackleg disease while Desiree was the least susceptible .Different method to treat the blackleg disease. The symptoms were reduction in the production of tubers and the appearance of infected of leaves and the reduction in different plant heights. The bacteria that cause this disease were isolated from potato tubers, shoots, soil and water. The mother tubers were found to be major source of inoculums for blackleg disease.

The Nature of the Pedogenic and Geoinformatics Distribution of Iron Oxides in Different Physiographic Units

“…The difference in the nature of the color components of the genetic horizons in the soil pedons is due to the influence of the nature of the physiographic location as well as the influence of the parent material, so the difference in the wavelength of light, as well as the values of brightness intensity and color chroma, reflect the nature of the internal characteristics of the genetic horizons and the extent of the genetic development that they went through in the previous time The dominance of the dark color indicates the nature of the effect of the content of the decomposed organic matter as well as the increase in the moisture content in it, as well as the presence of iron minerals, especially the minerals hematite, biotite, and alkene. The color of the soil is determined depending on its content of the main components, as the yellow or red color indicates The presence of some types of iron oxides, for example, the yellow color may indicate the dominance of the mineral goethite, while the red color may indicate the dominance of the mineral hematite, while the pale white color indicates the dominance of the mineral calcite and dolomite [19].…”