Studies on air-borne fungi at Qena. I. Seasonal fluctuations

73 species which belong to 24 genera were collected in 200 and 35 exposures made during the period May 1976-October 1977 at each of two levels (2 m and 20 m). The air-borne fungi showed seasonal periodicities and the highest incidence was recovered in spring and autumn and the least in the summer. Aspergillus was the dominating genus. 17 species were collected at the two levels of which A. niger and A. flavus were the most common. Other common genera were Cladosporium which was represented by C. herbarum, C. cladosporioides, C. sphaerospermum, and C. macrocarpum. 7 species of Curvularia were identified of which C. pallescens was the most frequent at the low and C. spicifera at the high level. Drechslera was represented by 6 species of which D. halodes was the most common at the two levels. Only one Alternaria species, A. alternata was isolated at both levels. 10 Penicillium were recovered, P. notatum was the most frequently one isolated at the two levels. Many fungal spore showers of Cladosporium, Aspergillus, Curvularia, and Alternaria were recorded during the experimental period.