Organic apple farmers keep their fruit free of worms by spraying their trees with a naturally occuring virus. But insects in some orchards in Germany have developed resistance to this biological insecticide and farmers are concerned.
Listen (NPR)
Organic apple farmers keep their fruit free of worms by spraying their trees with a naturally occuring virus. But insects in some orchards in Germany have developed resistance to this biological insecticide and farmers are concerned.
Listen (NPR)