Soil clay, trees open sun condition, wet and dry at times 4 seasons. Stoney Creek, Ontario
Apple trees young fruits have spots
Prune tree, young fruits are falling- seems most of them, quite a lot. The tree also has black looking pieces spread throughout.
Thank you for contacting the Toronto Master Gardeners.
There are a number of insects, disease and physiological disorders of apples can cause spots on the fruit. From your photo it is difficult for me to determine exactly what type of spots are exhibited on your apples The Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) has an excellent website, What Are the Spots on My Apple? with photos so that you can determine with certainty what disorder is affecting your apples. The website also lists what stratgies are available to control your specific disorder.
As for your plum tree question, it is one we have answered before so I’m attaching a link to a previous question & answer which should give you all the guidance you need, see below:
The black looking pieces that you are observing on your plum tree are probably black knot. Black knot is a fungal infection (Angiosporina morbosa) that affects mainly plum and cherry trees but also other trees of the Prunus genus such as apricot. The disease isn’t new. It was described in Pennsylvania almost 200 years ago.
Previous inquiries to ASK regarding Black Knot and its control can be accessed through the following:
https://www.torontomastergardeners.ca/?s=black+knot
Lastly, please note that as Toronto Master Gardeners, we answer gardening questions only for those whose gardens are in the city of Toronto. You will see that we highlight this at the top of our website page. Check the Master Gardeners of Ontario website to find your local Master Gardener group.