Abstract
Gloeosporium perennans Zeller & Childs and G. album Osterw. were determined as the most important causal agents of apple rot in storage among 20 apple varieties from 17 localities in Finland. G. fructigenum Berk, was relatively insignificant in causing the disease. Infection spots of both G. perennans and G. album began to appear in the fruit at approximately the same time during January. All of the apple varieties investigated were found to be susceptible to Gloeosporium rot, although there were distinct differences in the susceptibility of certain varieties to one or another of the two species. The occurrence of the Gloeosporium species varied considerably in the same apple variety between different orchards. External factors such as dry weather in the late summer, fungicidal sprays, and carbon dioxide during storage were found to decrease the occurrence of Gloeosporium rot in stored apples as well as to cause changes in the relative proportions of the two species G. perennans and G. album.
Highlights
G. perennans is known as an important causal agent of apple rot, especially in fruit preserved in cold storage [5, 6, 12]
Gloeosporium perennans Zeller & Childs and G. album Osterw. were determined as the most important causal agents of apple rot in storage among 20 apple varieties from 17 localities in Finland
G. fructigenum Berk, was relatively insignificant in causing the disease. Infection spots of both G. perennans and G. album began to appear in the fruit at approximately the same time during January
Summary
Received May 19, In storage trials on apples carried out in the years 1952â1955 by the Department of Plant Pathology, the most important cause of losses in the stored fruit was apple rot caused by the fungus Gloeosporium [8]. Since 1954 the Department of Plant Pathology has continued its trials on stored apples in order to determine the various species of Gloeosporium found in this fruit during storage. The experimental material in the years 1954â58 included a total of 20 apple varieties from 17 different localities in Finland. Determinations of the fungus species in the diseased apples were made during the storage period on the basis of the form and shape of the acervuli as well as on the size and form of the conidia. Species determinations made on the basis of acervuli and conidial shape and size
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