Different bacterial strains were recorded as onion rot pathogens. The candidate strains in one region may differ from the other and it may be only one pathogen responsible of the infection in an area or a combination from different pathogens. The present research aimed at detection of the main bacterial pathogen (s) causing onion rot in Egypt throughout storage. Five bacterial pathogens were detected with different occurrence percentage; Erwinia carotovora subspecies carotovora (48.14 %), Erwinia cacticida (18.51 %), Erwinia carotovora subspecies atroseptica (14.81 %), Burkholderia cepacia (14.81 %) and Pantoea sp. (3.7 %).

his study was conducted to reveal the spread and disease severity of mango decayed after harvesting on the most commercial verities (Keitt, Kent and Tommy Atkins). Disease survey was studied on mango fruits collected from the fields of two localities: Ismaillia and Nobaria district. In addition of diseased samples were collected after harvesting and marketing from El-Aboor and 6 th October markets. Varietal susceptibility was studied under laboratory conditions. Three attempts were carried out as save treatments to control the disease using chitosan, citral; two bioagents Pseudomonaes fluorescens and Candida tennis as well as hot water. Shelf life, fruit contents of total soluble solids (TSS), titratable acidity (TA) and vitamin C were also taken into consideration.

he pear disorder described as fire blight has long been disputed in Egypt due to relatively dry climate unfavorable for the disease epidemic. Efforts were carried out in the present work to clarify the cause of confusion and to elucidate some aspects of such discrepancies. Orchards inspections in El-Behera governorate revealed obvious scorching on foliage of some trees, without noticeable seeping under many circumstances. The syndrome disputed plant pathologists in many institutions, because of the validated absence of such scorching on apple trees raised in the same pear orchard. Samples collected from different pear organs of sporadically affected trees, were subject to isolate the pathogen on either high sucrose or Miller-Schroth (MS), media selective for Erwinia amylovora. Macroscopic, microscopic, biochemical and molecular determinations revealed no obvious variation among isolates recovered from different pear tree organs. The obtained results indicated that, the isolated bacteria belonged to Erwinia amylovora. Isolates from cankerous branches, however, were more pathogenic compared to those recovered from other plant organs. The rootstocks dominating in Egypt are P.communis, P.betulaefolia and P.calleryana. The effect of such rootstocks on" MKM" grafted pear cultivar was compared. The differences in the blooming date and variation in the occurrence and severity of such a disorder was evaluated. The earlier blooming, as shown influenced by the rootstock effect, the lower the disease expression. P.calleryana and P.betulaefolia showed full blooming in the third week of March, and escaped severe infection. The remarkable late onset of flowering of P.communis grafted trees commencing at the end of March, resulted in greater disease complications, due to the possible discharge of bacteria from holdover cankers, coinciding with more favorable temperature and higher insect activity. The influence of different rootstocks on growth habits of pear grafts and their respective influence on the disorders in concern must be fully investigated. The occurrence of associated microscopic mites must be seriously considered, which may be contributing to the reported discrepancy among scientists and the contradictory remarks on fire blight epidemics in Egypt.