BRUSSELS - Outside Kagio, a small town in central Kenya, Joshua Murimi Wanjohi stands at the edge of his tomato field and watches one of his farm workers stirring chemicals into a blue plastic barrel: the fungicide Topstar from a Chinese manufacturer, which he uses alternately with the insecticide Belt from the German company Bayer.

Both contain highly hazardous ingredients whose approval has not been renewed in the EU.

The import of pesticides into Kenya has increased massively, from 500 tonnes in 2000 to an estimated 18,000 tonnes by 2018.