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That’s partly because of more and more gardeners going organic and releasing Trichogramma wasps, but I think the increase in birds is also a factor.

There, a tiny introduced parasitic wasp called Trichogramma brassicae has become a key weapon against the corn rootworm, a major pest.

Fuelled by growing demand from Brazil's vast agricultural sector, Bug has developed a way to mass produce a tiny wasp called trichogramma that eats caterpillars and other pest insects.

Scientists are breading tiny wasps called Trichogramma, which feed on the eggs of destructive pests, replacing toxic insecticides.

Bug mass-produces Trichogramma galloi, a breed of wasps able to parasitise moth eggs.