A second showing of the award-winning film.
This is a measure of the problem that faces us in the insect war, their powers of reproduction are pitched against our insecticides. But today these insecticides are fast becoming redundant not just because of their severe side effects but simply because they are fast losing their effectiveness. More and more pests are becoming resistant.
So alternatives must be found, and tonight's Horizon looks at the efforts both here and abroad to discover and apply them. It's work in which the scientists themselves may seem to display a fiendish cunning as they experiment with techniques that range from subtly interfering with the pest's sex life to a bizarre use of tin foil to fool the ubiquitous aphid.
But one fact stands out. The pest problem is nowhere more complicated than in an ordinary British field.