Ülkemizde yetiştirilen bazı fasulye çeşitlerinin Pseudocercospora griseola (Sacc.) Crous & U. Braun’dan kaynaklanan Fasulye köşeli yaprak lekesi hastalığına karşı reaksiyonları

Abstract

Vegetable bean production as mid-season crops in greenhouses has increased in two provinces, Bartın and Zonguldak, in the Western Black Sea region. Green bean is sown in about half of the total area of 510.000 da in this region. Angular leaf spot disease caused by Pseudocercospora griseola has been a serious disease for the last five years and it is so widespread in the region, showing almost 100% incidence. Since the beans are used for fresh consumption and are harvested continuously, fungicide use is restricted due to unwanted residues. Because of the farmers in the region widely use two local cultivars susceptible to the disease, providing resistant cultivars for farmers was the aim of this study. Although the causal agent has great pathogenic variation, determination of pathotypes of the P. griseola was not succeed since the three of the differential cultivars did not produced seed in two tested regions of Turkey. For this reason seventeen common bean cultivars in Turkey were selected and their reactions against ten randomly selected the most aggressive isolates of P. griseola were used for screening resistance. Two bush type bean cultivars, Bourgondia and Yalova 17, out of nine showed resistant reaction against all of ten isolates while three climbing types, Fabio, Burayşe and Selvi, out of eight were found resistant against all of the isolates of P. griseola. All of these resistant cultivars have good culinary characteristics.