Incidence of virus fungal diseases on three stone fruits cultivars in Hungary

I J Holb,Z Szabó,J Nyéki,M Soltész

doi:10.31421/ijhs/16/3/906

Abstract

In this two-year study, incidence of Polystigma rubrum on plum, and Apiognomonia erytrostoma on apricot were evaluated on several stone fruit cultivars in Hungary. Results showed that most apricot cultivars expressed symptoms caused by A. erytrostoma, graded between 2 and 3 (10-50%) by the end of the summer in 2005 and 2006. The most tolerant apricot cultivars were Budapest and Mandulakajszi while the most susceptible ones were ’Magyar kajszi’ and ’Piroska’.Assessments made on plum showed that most of the plum cultivars were tolerant or lowly susceptible to P. rubrum such as ’Ageni’, ’Althann ringló’, ’Bluefre’, ’Cacanska najbolja’, ’Silvia’, ’Ruth Gerstetter’, ’Tuleu gras’ and ’Utility’. The most susceptible plum cultivars to P. rubrum were ’Besztercei clones’ and ’Debreceni Muskotály’.

Highlights

Among stone fruit diseases, those fungal pathogens are of great importance which cause early leaf fall and fruit rot
At Kecskemét, 13 apricot and 17 plum cultivars were evaluated for infections caused by A. erytrostoma and P. rubrum, respectively
Assessment made in apricot in 2008 showed that most cultivars expressed symptoms caused by A. erytrostoma grading between 2 and 3 (10–50%) by the end of the summer

Summary

Introduction

Those fungal pathogens are of great importance which cause early leaf fall and fruit rot. Due to early leaf fall, nutrient accumulation stops from leaves to buds. Fungal pathogens causing early leaf fall include Polystigma rubrum on plum and Apiognomonia erytrostoma on apricot (Holb & Erdôs, 2005; Holb, 2005; Holb et al, 2007). (mainly M. fructigena and M. laxa) the most important stone fruit disease. Since the pathogens are wound parasites, it appears on the fruits at injuries after hail or strong pest damage. Brown rotting of fruits starts and grey conidiophores appears on their surface. The primary inoculum sources of the disease are the dead woody parts and the fruit mummies. Its host plants include the stone fruit species (Holb, 2004, 2006)

Methods

Results

Conclusion