|Conker Tree Science|
Believe it or not there are dozens of different kinds of tiny wasps (only distantly related to the stinging wasps that we are so familiar with) that attack the horse-chestnut leaf-miner. These wasps are so small that they lay their eggs inside the leaf-miner as it is eating the horse-chestnut leaf from the inside out! The developing wasp larvae eat the leaf-miner from the inside out and then burst out of the caterpillar, in the process killing it and so acting as a natural pest controller.
Can these potential pest controllers actually help by parasitising enough of the leaf-miners to control it's numbers? Given that we have so many of the leaf-miners in this country it would seem that they cannot, but we are interested in finding out more about them.