I have and my father before me, tried to deal with pear midge on a very old pear tree in our garden (over 100 years old). The pear tree flowers profusely and produces ‘pearlets’ but many if not most of them have been invaded by pear midge which rots out the centre and the ‘pearlet’ turns black drops off and dies. Is there anythjing I can spray with to prevent this happening in the future. When the pears come to maturity they are wonderful and store very well.
Spraying with an insecticide just before the blossom opens can help too as it kills the female midges before they lay eggs at flowering. Or as soon as the blossom falls, spray to kill the larvae before they burrow into the fruit.