The invention relates to a method of controlling insects that are resistant to neo- nicotinoid insecticides, using the compound 4,5-dihydro-6-methyl-4-(3-pyridylmethyleneamino)-1,2,4-triazin-3(2H)-one in free form or in agrochemically acceptable salt form as well as the use of compositions comprising said compound to control neonicontinoid resistant insects. In particular the methods relate to controlling neonicotinoid resistant insects in the Delphacidae and Cicadellidae families, especially planthoppers (e.g. insects of the genus Nilaparvata, Sogatella and/or Laodeiphax), and/or leafhoppers that are resistant to one or more neonicotinoid insecticides. Methods of the invention find particular use in controlling neonicotinoid resistant insects in crops of useful plants, in particular in cereal crops, including rice. Furthermore, the invention extends to methods of controlling plant viruses spread by neonicotinoid resistant insects.
