The latest figures from Defra show nearly 20,000 badgers were killed across England last year, as part of the Government's policy to tackle TB in cattle. Badger campaigners say that the continued culling is leading to local extinctions. Defra says there are no easy answers, but badger culling "has proved highly effective and needs to remain a part of our holistic approach".Jeremy Clarkson says if he wanted to make money from his thousand acre Oxfordshire farm he'd put as much as possible into government environmental schemes. Instead he's turned it into a TV show and for the third series, which starts today, he's gone into pigs. Fusarium basal rot: its a fungus and apparently the single biggest problem facing the country's onion growers. This week we're looking at crop pests and diseases and the efforts being made to combat them. Researchers are looking into technology which can sniff-out early stage disease.Presented by Charlotte Smith and produced by Beatrice Fenton.