Peaches rotting from the inside

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Dear garden expert, I have: 1.) A peach tree, which is almost collapsing under the sheer amount of fruit it bears. Unfortunately, many of the fruits rot and go mouldy even before they are fully ripened. The fruits rot from the inside, and remain in part hanging in their mouldy state on the tree. Have you got any tips on what might be the cause? 2.) Your description of plums and damsons: My “plum tree” bears large, yellow, very tasty fruits. It can’t be a damson tree due to its colour, but the size of the fruit means that it can’t be a plum! What do you think it is?

The GARDENA gardening expert

Regarding your first question:
Fungal diseases such as your current problem are frequently observed, as it has frequently been damp and yet warm during the ripening phase of peaches and nectarines. I suggest that you spray the trees next year with an appropriate fungicide, such as Fruit Fungi-free Teldor (manufactured by Bayer). At the same time I would like to remind you to prune back the tree and the plants surrounding it. A well-ventilated tree and garden situation permits precipitation and high air humidities to evaporate more easily. Fungal diseases can’t cope well in a dry environment. In addition, I would advise you not to leave too many fruits hanging when the tree has produced such a rich harvest, as the densification of fruits increases the infestation rates through parasitic fungi. Thin out the fruit so that each fruit hangs at a distance of ten centimetres to the next one. This not only lowers infestation rates, but also improves the quality of the harvest. 

As to your second question:
If the fruits are large, yellow and very juicy, this tree will be a greengage tree, in particular the variety “Oullins”. If the flesh of the fruit is not so juicy and tender, but rather more firm and with a slightly bitter taste around the stone, it will be an Ontario plum. Or, if the fruit is not round but rather elongated, this could in fact be a damson, as the varieties “Thacro” or “Tipala” are yellow in colour.

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