You are having a bountiful harvest this year!
I found this about black spots on pear leaves, which are probably a fungus.
Treatment and Control:
Sanitation: Remove and destroy infected leaves and fruit to reduce the spread.
Fungicides: Apply fungicides like captan, myclobutanil, or chlorothalonil in early spring, especially during wet weather.
Resistant varieties: Consider planting pear varieties that are more resistant to these diseases.
Pruning: Prune trees to improve air circulation and reduce humidity, which can help control fungal diseases.
Early intervention: Control the disease early in the season to minimize initial inoculum.

I'm very impressed by your onion crop! And all those apples!