USING SOME NEW TRENDS IN CONTROLLING SOME STORAGE AND SOIL PATHOGENIC ICROORGANISMS AFFECTING ONION CROP'S PRODUCTIVITY

Abstract

Onion (Allium cepae L.) is one of the most important vegetable crops in Egypt as well as many other countries for both local consumption and exportation. Several soil borne pathogenic microorganisms (fungi and bacteria) are attacking it during growth and storage periods causing yearly serious losses in obtained yieid bulbs.

The obtained results of the present study could be summarized as follows:

!-Sum of 262 fungal isolates were obtained during isolation trails from seeds of onion, naturally diseased onion seedlings grown insef:d-bed, fresh and stored onion bulbs in addition to the. infected bulbs which were collected as samples from three different locations (El-Behira, El-Kalubia and El-Menia Governorates). Fungal isolates were classified as 34, 178 and 50 isolates from seeds, infected seedlings bulbs at field and infected stored bulbs respectively. The identified fungi were found• to belong to Aspergillus niger, Aspergillus. sp, Alternaria sp, Fusarium solani, F. oxysporumfsp. cepae, Sclerotium . cepivorum, Epicoccum spp and Urocystis cepulae.