I have just gone round my five fruit trees to put up bird netting, but although the cherry, plum, eating & cooking apples look fine, my pear tree seems very sick. The leaves all have brown edges, & some appear to have been eaten away in patches. I cant SEE any insects, but is it possible? Most serious symptom is the total lack of any fruit, while the others are coming on nicely.
I did a surface dressing of fish, blood and bonemeal in the early spring.