The present invention relates to a method of controlling insects (in particular insects of the order Hemiptera, especially aphids and whitefly) that are resistant to neonicotinoid insecticides, to methods of controlling insects whereby undesired insects are affected but beneficial arthropods are not affected, using compounds of formula (I) (where A, R1 and R2 are as defined above), and, further, to novel compounds of formula (I) which are useful in the aforementioned methods and/or which possess enhanced insecticidal properties, and to compositions containing said compounds.