By far the biggest change to The UK Pesticide Guide in 2020 is the loss of a number of active ingredients that have been fundamental to many crop protection programmes. The final use-up of chlorothalonil formulations; propiconazole, fenpropimorph, chloridazon and diquat occurs in 2020 but there are also a few of exciting new additions. Aclonifen is a new residual herbicide for use in potatoes that already has a number of EAMUs for use in minor crops. BASF is launching its new triazole, mefentrifluconazole, which promises to restore full triazole activity, at least initially. On the insecticide front the new active ingredient from Corteva agriscience, sulfoxaflor, is now listed for use in Cucurbitae and ornamentals under full protection for control of aphids and whitefly.