2.3.3
b>COMPERATIVE STUDY OF FUNGAL DISEASES ON DIFFERENT REED STANDS
COMPERATIVE STUDY OF FUNGAL DISEASES ON DIFFERENT REED STANDS
R BANl, A ENGLONER2
lGodollo University of Agricultural Sciences, Department of Plant Protection, 2103 Godollo, Hungary; 2Ecology University, Department of Plant Taxonomy and Ecology, Budapest, Hungary
Background and objectives
Several fungal diseases have been described from reed so far, since they might act as causal agents of reed decline and can infect cultivated plants, as well [1]. Although morphological studies and brief descriptions of these pathogens are available from all over the world, their spread and effect on the plant are still poorly investigated [2]. Our present study provides data about fungal distribution on different reed stands and search for any correlation existing among infections.
Materials and methods
More than 200 plants of eight sampling sites in a coastal reedbelt were examined in October 1996 and 1997, at Lake Balaton, Hungary. Each site consisted of a a good (category I.) and a medium (category III.) quality of reeds, where classification were basically made by visual observations. Infection indices were calculated for the main fungal reed pathogens, such as Puccinia phragmitis, Deightoniella arundinacea, Deightoniella roumeguerei and Phoma sp. Statistical comparison of data from different sites and categories was executed by Principal Component Analysis and Canonical Variate Analysis.
Results and conclusions
Statistical analysis resulted in only small differences between reed categories in infection indices. Puccinia phragmitis showed correlation towards the first category of reeds while Deightoniella species towards the type III quality. The two types of reed stan s, owever, are concerned to be similar on each sites according to the infection indices of pathogenic fungi respectively, while separation seems to be better based on the total infection indices including all fungi examined. Furthermore, relevant negative correlation was found between the distribution of P. phragmitis and Phoma sp. each year. On those areas, where quantitative changes were observed in the distribution of the pathogens the infection indices of Puccinia phragmitis increased and that of Phoma sp. decreased signifficantly from one year to the other, which also supports the previous finding.
References
1. Ban R, Weirach A, Fischt G, 1994. Environmental Microbiology. Proceedings of the eighth symposium, pp. 151-52.
2. Ban R, Fischi G, Virinyi F, 1996. Acta Phythopathologica et Entomologica Hungarica 31, 219-27.