Although it’s unlikely to get rid of all of the box tree caterpillars in your garden, pheromone traps can definitely limit the breeding of these critters. John says, ‘They work by luring male ...

The nematodes breed inside the caterpillar, releasing more nematodes into the surrounding area which go on to kill more caterpillars. You could also try a box tree pheromone trap to catch the male ...