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Studies undertaken in 2002–2004 on ‘Golden Delicious’ apple fruits showed the presence of amino acids on the surface of their skin. Amount of total free amino acids ranged from 2.5 to 3.0 mg/L. In in vitro bioassays it was found that amino acids as a basic source of nitrogen did not activate germination of conidia of Peltaster fructicola (Johnson). However amino acids stimulated elongation of germ...
The fungi that cause sooty blotch grow only on the apple skin, so they use appropriate nutrients which are present on the fruit surface. It has been shown that when the first symptoms of sooty blotch occur a noticeable increase of glucose and fructose content both on the apple skin and in juice is observed. Such increase occurs at pH 4.4. An effect of surface glucose and fructose on the growth of...
Investigations have been undertaken to determine which fungi species are responsible for occurrence of sooty blotch disease in Poland. It was found that disease complex is caused by Tripospermum myrti (Lind) Hughes, Phialophora sessilis de Hoog and Peltaster fructicola Jonhson. There was no evidence of the presence fungus described as Gloedes pomigena which was previosly considered as a casual agent...
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